Lycoming IO-320-B1A, IO-320-A2A, IO-320-E2B, IO-320-E1A, IO-320-B1B Operator's Manual
...
NOTE
In order to accommodate clearer type, larger charts and graphs, and more
detailed illustrations, this edition of the IO-320 Series Operator’s Manual,
Lycoming Part Number 60297-31 is presented in an 8-1/2 x 11 inch
format. This edition is a complete manual, current as of the date of issue.
The manual incorporates all previously issued revisions.
This manual will be kept current by revisions available from Lycoming
distributors or from the factory. All revisions will be accompanied by an
Operator’s Manual Revision page which will identify the revision level, the
date of the revision, and the pages revised, added or deleted. All revisions
will be supplied in the 8-1/2 x 11 inch format.
Operator’s Manual
Lycoming
IO-320 Series
Approved by FAA
3rd Edition Part No. 60297-31
652 Oliver Street
January 2007
Williamsport, PA. 17701 U.S.A.
570/323-6181
IO-320 Series Operator’s Manual
Lycoming Part Number: 60297-31
©2006 by Lycoming. All rights reserved.
Lycoming and “Powered by Lycoming” are trademarks or registered trademarks of
Lycoming.
All brand and product names referenced in this publication are trademarks or registered
trademarks of their respective companies.
For additional information:
Mailing address:
Lycoming Engines
652 Oliver Street
Williamsport, PA 17701 U.S.A.
Phone:
Factory: 570-323-6181
Sales Department: 570-327-7268
Fax: 570-327-7101
Lycoming’s regular business hours are Monday through Friday from 8:00 AM
through 5:00 PM Eastern Time (-5 GMT)
Visit us on the World Wide Web at:
http://www.lycoming.textron.com
LYCOMING OPERATOR’S MANUAL
ATTENTION
OWNERS, OPERATORS, AND MAINTENANCE PERSONNEL
gine, its specifications, and detailed information on
how to operate and maintain it. Such maintenance procedures that may be required in conjunction with
periodic inspections are also included. This manual is intended for use by owners, pilots and maintenance
personnel responsible for care of Lycoming powered aircraft. Modifications and repair procedures are
contained in Lycoming overhaul manuals; maintenance personnel should refer to these for such procedures.
SAFETY WARNING
Neglecting to follow the operating instructions and to carry out periodic maintenance procedures can result
in poor engine performance and power loss. Also, if power and speed limitations specified in this manual
are exceeded, for any reason, damage to the engine and personal injury can happen. Consult your local
FAA approved maintenance facility.
SERVICE BULLETINS, INSTRUCTIONS, AND LETTERS
Although the information contained in this manual is up-to-date at time of publication, users are urged to
keep abreast of later information through Lycoming Service Bulletins, Instructions and Service Letters
which are available from all Lycoming distributors or from the factory by subscription. Consult the latest
revision of Service Letter No. L114 for subscription information.
NOTE
The illustrations, pictures and drawings shown in this publication are typical of the subject matter they
portray; in no instance are they to be interpreted as examples of any specific engine, equipment or part
thereof.
iii
LYCOMING OPERATOR’S MANUAL
IMPORTANT SAFETY NOTICE
Proper service and repair is essential to increase the safe, reliable operation of all aircraft engines. The
service procedures recommended by Lycoming are effective methods for performing service operations.
Some of these operations require the use of tools specially designed for the task. These special tools must be
used when and as recommended.
It is important to note that most Lycoming publications contain various Warnings and Cautions which
must be carefully read in order to minimize the risk of personal injury or the use of improper service
methods that may damage the engine or render it unsafe.
It is also important to understand that these Warnings and Cautions are not all inclusive. Lycoming could
not possibly know, evaluate or advise the service trade of all conceivable ways in which service might be
done or of the possible hazardous consequences that may be involved. Accordingly, anyone who uses a
service procedure must first satisfy themselves thoroughly that neither their safety nor aircraft safety will be
jeopardized by the service procedure they select.
iv
WARRANTY
NEW AND REBUILT ENGINES
(1) WARRANTY AND REMEDY: Lycoming Engines, a division of Avco Corporation (hereinafter “Lycoming”)
warrants each new Lycoming reciprocating engine to be free from defect in material or workmanship under normal
use and service. Lycoming’s sole obligation under this warranty is limited to replacement or repair of parts which
are determined by Lycoming to have been defective within a period of twenty-four (24) months after new aircraft
delivery to the original retail purchaser or first user, or twenty-four (24) months from the date of first operation. The
warranty period of twenty-four (24) months commences on the earlier of the date of first operation after new aircraft
delivery to the original retail purchaser or first user, or twenty-four (24) months from the date of shipment from
Lycoming. Lycoming will, in connection with the foregoing warranty, cover reimbursement of reasonable freight
charges with respect to any such warranty replacement or repair.
(2) Within the warranty period, Lycoming will reimburse the Purchaser for labor charges associated with warranty
related issues. Lycoming will only reimburse the cost of such labor charges in connection with repair or
replacement of parts as provided in Lycoming’s then current Removal and Installation Labor and Allowance
Guidebook. Spare parts installed as warranty replacement on engines which are covered by this New Engine
Warranty will be warranted for the balance of the original warranty period or for the spare part warranty, whichever
is the greater. Replacement of parts may be with either new or reconditioned parts, at Lycoming’s election. A claim
for warranty on any part claimed to be defective must be reported in writing to Lycoming’s Warranty
Administration within 60 days of being found to require repair or replacement by the purchaser or service facility.
Warranty adjustment is contingent upon the Purchaser complying with the Lycoming’s Warranty Administration
disposition instructions for defective parts. Failure to comply with all of the terms of this paragraph may, at
Lycoming’s sole option, void this warranty.
(3) THIS WARRANTY IS GIVEN AND ACCEPTED IN PLACE OF (i) ALL OTHER WARRANTIES OR
CONDITIONS, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES
OR CONDITION OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE AND (ii) ANY
OBLIGATION, LIABILITY, RIGHT, CLAIM OR REMEDY IN CONTRACT OR IN TORT (DELICT),
INCLUDING PRODUCT LIABILITIES BASED UPON STRICT LIABILITY, NEGLIGENCE, OR IMPLIED
WARRANTY IN LAW AND PURCHASER HEREBY WAIVES SUCH RIGHTS AND CLAIMS.
(4) THIS WARRANTY IS THE ONLY WARRANTY MADE BY LYCOMING. THE PURCHASER’S SOLE
REMEDY FOR A BREACH OF THIS WARRANTY OR ANY DEFECT IN A PART IS THE REPAIR OR
REPLACEMENT OF ENGINE PARTS AND REIMBURSEMENT OF REASONABLE FREIGHT CHARGES AS
PROVIDED HEREIN. LYCOMING EXCLUDES LIABILITY, WHETHER AS A RESULT OF A BREACH OF
CONSEQUENTIAL DAMAGES, INCLUDING, BUT NOT LIMITED TO, DAMAGE TO THE ENGINE OR
OTHER PROPERTY (INCLUDING THE AIRCRAFT IN WHICH THE ENGINE IS INSTALLED), COSTS AND
EXPENSES RESULTING FROM REQUIRED CHANGES OR MODIFICATIONS TO ENGINE COMPONENTS
AND ASSEMBLIES, CHANGES IN RETIREMENT LIVES AND OVERHAUL PERIODS, LOCAL CUSTOMS
FEES AND TAXES, AND COSTS OR EXPENSES FOR COMMERCIAL LOSSES OR LOST PROFITS DUE TO
LOSS OF USE OR GROUNDING OF THE AIRCRAFT IN WHICH THE ENGINE IS INSTALLED OR
OTHERWISE. LYCOMING’S TOTAL LIABILITY FOR ANY AND ALL CLAIMS RELATED TO ANY
ENGINE SHALL IN NO CASE EXCEED THE ORIGINAL SALES PRICE OF THE ENGINE. SELLER MAKES
NO WARRANTY AND DISCLAIMS ALL LIABILITY WITH RESPECT TO COMPONENTS OR PARTS
DAMAGED BY, OR WORN DUE TO, CORROSION.
(5) This warranty shall not apply to any engine or part thereof which has been repaired or altered outside
Lycoming’s factory in any way so as, in Lycoming’s sole judgment, to affect its durability, safety or reliability, or
which has been subject to misuse, negligence or accident. Repairs and alterations which use or incorporate parts and
components other than genuine Lycoming parts or parts approved by Lycoming for direct acquisition from sources
other than Lycoming itself are not warranted by Lycoming, and this warranty shall be void to the extent that such
repairs and alterations, in Lycoming’s sole judgment, affect the durability, safety or reliability of the engine or any
part thereof, or damage genuine Lycoming or Lycoming-approved parts. No person, corporation or organization,
including Distributors of Lycoming engines, is authorized by Lycoming to assume for it any other liability in
connection with the sale of its engines or parts, nor to make any warranties beyond the foregoing warranty nor to
change any of the terms hereof. NO STATEMENT, WHETHER WRITTEN OR ORAL, MADE BY ANY
PERSON, CORPORATION OR ORGANIZATION, INCLUDING DISTRIBUTORS OF LYCOMING ENGINES
MAY BE TAKEN AS A WARRANTY NOR WILL IT BIND LYCOMING. NO AGREEMENT VARYING THE
TERMS OF THIS WARRANTY OR LYCOMING’S OBLIGATIONS UNDER IT IS BINDING UPON
LYCOMING UNLESS IN WRITING AND SIGNED BY A DULY AUTHORIZED REPRESENTATIVE OF
LYCOMING.
(6) All legal actions based upon claims or disputes pertaining to or involving this warranty including, but not limited
to, Lycoming’s denial of any claim or portion thereof under this warranty, must be filed in the courts of general
jurisdiction of Lycoming County, Commonwealth of Pennsylvania or in the United States District Court for the
Middle District of Pennsylvania located in Williamsport, Pennsylvania. In the event that Purchaser files such an
action in either of the court systems identified above, and a final judgment in Lycoming’s favor is rendered by such
court, then Purchaser shall indemnify Lycoming for all costs, expenses and attorneys’ fee incurred by Lycoming in
defense of such claims. In the event Purchaser files such a legal action in a court other than those specified, and
Lycoming successfully obtains dismissal of that action or transfer thereof to the above described court systems, then
Purchaser shall indemnify Lycoming for all costs, expenses and attorneys’ fees incurred by Lycoming in obtaining
such dismissal or transfer.
(7) Any invalidity of a provision of this Warranty shall not affect any other provision, and in the event of a judicial
finding of such invalidity, this Agreement shall remain in force in all other respects.
Effective September 2006 Revision “M”
Ô§½±³·²¹ Û²¹·²»-
652 Oliver Street
Williamsport, Pennsylvania
17701
(570) 323-6181
www.lycoming.textron.com
LYCOMING OPERATOR’S MANUAL
TABLE OF CONTENTS
Page
SECTION 1 DESCRIPTION 1-1
SECTION 2 SPECIFICATIONS 2-1
SECTION 3 OPERATING INSTRUCTIONS 3-1
SECTION 4 PERIODIC INSPECTIONS 4-1
SECTION 5 MAINTENANCE PROCEDURES 5-1
SECTION 6 TROUBLE-SHOOTING 6-1
SECTION 7 INSTALLATION AND STORAGE 7-1
SECTION 8 TABLES 8-1
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LYCOMING OPERATOR’S MANUAL
vi
LYCOMING OPERATOR’S MANUAL
SECTION 1
DESCRIPTION
Page
General.......................................................................................................................................................... 1-1
Cylinders.......................................................................................................................................................1-1
Valve Operating Mechanism ...................................................................................................................... 1-1
Crankcase .....................................................................................................................................................1-1
Crankshaft.................................................................................................................................................... 1-1
Connecting Rods .......................................................................................................................................... 1-1
Pistons ...........................................................................................................................................................1-2
Accessory Housing.......................................................................................................................................1-2
Oil Sump.......................................................................................................................................................1-2
Cooling System.............................................................................................................................................1-2
Induction System..........................................................................................................................................1-2
Lubrication System...................................................................................................................................... 1-2
Priming System............................................................................................................................................ 1-3
Ignition System.............................................................................................................................................1-3
Model Application Table............................................................................................................................. 1-3
This Page Intentionally Left Blank.
LYCOMING OPERATOR’S MANUAL SECTION 1
IO-320 SERIES DESCRIPTION
SECTION 1
DESCRIPTION
The IO, AIO and LIO-320 series are four cylinder, direct drive, and horizontally opposed air-cooled
engines.
In referring to the location of the various engine components, the parts are described in their relationship
to the engine as installed in the airframe. Thus, the power take-off end is considered the front and the
accessory drive end the rear. The sump section is considered the bottom and the opposite side of the engine
where the shroud tubes are located the top. Reference to the left and right side is made with the observer
facing the rear of the engine. The cylinders are numbered from front to rear, odd numbers on the right, even
numbers on the left. The direction of rotation for accessory drives is determined with the observer facing the
drive pad. The direction of rotation of the crankshaft, viewed from the rear, is clockwise.
NOTE
The letter “L” in the model prefix denotes the reverse rotation of the basic model. Example:
model IO-320-C has clockwise rotation of the crankshaft. Therefore, LIO-320-C has
counterclockwise rotation of the crankshaft. Likewise, the rotation of the accessory drives of
the LIO-320-C are opposite those of the basic model as listed in Section 2 of this manual
Operational aspects of both engines are the same and performance curves and specifications
for the basic model will apply to the model with reverse rotation.
Cylinders – The cylinders are of the conventional air-cooled construction with the two major parts, head and
barrel, screwed and shrunk together. The heads are made from an aluminum alloy casting with a fully
machined combustion chamber. Rocker shaft bearing supports are cast integral with the head along with
housings to form the rocker boxes for both valve rockers. The cylinder barrels, which are machined from
chrome nickel molybdenum steel forgings, have deep integral cooling fins and the inside of the barrels are
ground and honed to a specified finish.
Valve Operating Mechanism – A conventional type camshaft is located above and parallel to the crankshaft.
The camshaft actuates hydraulic tappets, which operate the valves through push rods and valve rockers. The
valves rockers are supported on full floating steel shafts. The valve springs bear against hardened steel seats
and is retained on the valve stems by means of split keys.
Crankcase – The crankcase assembly consists of two reinforced aluminum alloy castings, fastened together
by means of studs, bolts and nuts. The mating surfaces of the two castings are joined without the use of a
gasket, and the main bearing bores are machined for use of prevision type main bearing inserts.
Crankshaft – The crankshaft is made from a chrome nickel molybdenum steel forging. All bearing journal
surfaces are nitrided.
Connecting Rods – The connecting rods are made in the form
They have replaceable bearing inserts in the crankshaft ends and bronze bushings in the piston ends. Two
bolts and nuts through each cap retain the bearing caps on the crankshaft ends.
1-1
SECTION 1 LYCOMING OPERATOR’S MANUAL
DESCRIPTION IO-320 SERIES
Pistons – The pistons are machined from an aluminum alloy. The piston pin is of a full floating type with a
plug located in each end of the pin. Depending on the cylinder assembly, pistons may employ either half
wedge or full wedge rings. Consult the latest revision of Service Instruction No. 1037 for proper piston and
ring combinations.
Accessory Housing – The accessory housing is made from an aluminum casting and is fastened to the rear of
the crankcase and the top rear of the sump. It forms a housing for the oil pump and the various accessory
drives.
Oil Sump (Except AIO Series) – The sump incorporates an oil drain plug, oil suction screen, mounting pad
for fuel injector, the intake riser and intake pipe connections.
Crankcase Covers (AIO Series) – Crankcase covers are employed on the top and bottom of the engine.
These covers incorporate oil suction screens and oil scavenge line connections. The top cover incorporates a
connection for a breather line and the lower cover a connection for an oil suction line.
Cooling System – These engines are designed to be cooled by air pressure. Baffles are provided to build up a
pressure and force the air through the cylinder fins. The air is then exhausted to the atmosphere through gills
or augmenter tubes usually located at the rear of the cowling.
Induction System – Lycoming IO-320 series engines are equipped with a Bendix type RSA fuel injector.
The fuel injection system schedules fuel flow in proportion to air flow and fuel vaporization takes place at
the intake ports.
A brief description of the fuel injector follows:
The Bendix RSA type fuel injection system is based on the principle of measuring airflow and using the
airflow signal in a stem type regulator to convert the air force into a fuel force. This fuel force (fuel pressure
differential) when applied across the fuel metering section (jetting system) makes fuel flow proportional to
airflow. A manual mixture control and idle-cut-off are provided.
Lubrication System – The lubrication system is of the pressure wet sump type. The main bearings,
connecting rod bearings, camshaft bearings, valve tappets, push rods and crankshaft idler gears are
lubricated by means of oil collectors and spray. The oil pump, which is located in the accessory housing,
draws oil through a drilled passage leading from the oil suction screen located in the sump. The oil from the
pump then enters a drilled passage in the accessory housing, where a flexible line leads the oil to the
external oil cooler. In the event that cold oil or an obstruction should restrict the flow of oil to the cooler, an
oil cooler bypass valve is provided. Pressure oil from the cooler returns to a second threaded connection on
the accessory housing from which point a drilled passage conducts the oil to the oil pressure screen, which
is contained in a cast chamber located on the accessory housing below the tachometer drive.
The oil pressure screen is provided to filter from the oil any solid particles that may have passed through
the suction screen in the sump. After being filtered in the pressure screen chamber, the oil is fed through a
drilled passage to the oil relief valve, located in the upper right side of the crankcase in front of the
accessory housing.
1-2
LYCOMING OPERATOR’S MANUAL SECTION 1
IO-320 SERIES DESCRIPTION
This relief valve regulates the engine oil pressure by allowing excessive oil to return to the sump, while
the balance of the pressure oil is fed to the main oil gallery in the right half of the crankcase. During its
travel through this main gallery, the oil is distributed by means of separate drilled passages to the main
bearings of the crankshaft. Separate passages from the rear main bearings supply pressure oil to both
crankshaft idler gears. Angular holes are drilled through the main bearings to the rod journals. Oil from the
main oil gallery also flows to the cam and valve gear passages, and is then conducted through branch
passages to the hydraulic tappets and camshaft bearings. Oil enters the tappets through indexing holes and
travels out through the hollow push rods to the valve mechanism, lubricating the valve rocker bearings and
valve stems. Residual oil from the bearings, accessory drives and the rocker boxes is returned by gravity to
the sump, where after passing through a screen it is again circulated through the engine. Pressure build up
within the crankcase is held to a minimum by means of a breather located on the accessory housing.
In addition, model IO-320-C1A incorporates oil jets in the crankcase. The oil jets furnish an oil spray to
provide internal cooling for the pistons.
Priming System – Provision for a primer system is provided on all engines employing a carburetor. Fuel
injected engines do not require a priming system.
Ignition System – Two magnetos furnish dual ignition. Consult Table 1 for model application. Bendix
magnetos are designed to permit periodic internal maintenance; Slick Electro magnetos are designed to
operate approximately 900 hours without internal maintenance.
TABLE 1
MODEL APPLICATION
Model Magnetos Dimensions
IO-320 Left Right Height Width Length
-A1A, -A2A* S4LN-200 S4LN-204 19.22 32.24 33.59
-B1A, -B2A* S4LN-21 S4LN-20 19.22 32.24 33.59
-B1B S4LN-21 S4LN-20 19.22 32.24 33.59
-B1C S4LN-21 S4LN-20 19.22 32.24 32.09
-B1D S4LN-1208 S4LN-1209 19.22 32.24 32.09
-B1E 4251 4250 19.22 32.24 32.09
-C1A, -C1B S4LN-21 S4LN-21 19.22 32.24 33.59
-D1A, -D1B S4LN-1227 S4LN-1209 23.18 32.24 30.70
-D1C 4251 4250 23.19 32.24 29.05
-E1A, -E2A* S4LN-21 S4LN-20 23.18 32.24 29.56
-E1B 4051 4050 23.19 32.24 29.05
-E2B* 4051 4050 23.18 32.24 29.05
AIO-320
-A1A, -A2A* S4LN-1208 S4LN-1209 20.76 32.24 30.08
-A1B, -A2B* S4LN-1227 S4LN-1209 20.76 32.24 30.08
-B1B S4LN-1227 S4LN-1209 20.76 32.24 30.08
-C1B S4LN-1227 S4LN-1209 25.57 32.24 30.08
LIO-320
-B1A S4RN-21 S4RN-20 19.22 32.24 33.59
-C1A S4RN-21 S4RN-21 19.22 32.24 33.59
* - Fixed Pitch Propeller
1-3
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LYCOMING OPERATOR’S MANUAL
SECTION 2
SPECIFICATIONS
Page
Explanatory Note.........................................................................................................................................2-1
Specifications – IO-320-A1A, -A2A, -E1A, -E1B, -E2A, -E2B................................................................. 2-2
Specifications – IO-320-B1A, -B1B, -B1C, -B1D, -B2A, -E1A, -D1B;
AIO-320; LIO-320......................................................................................................................................2-2
Specifications – IO-320-C1A, -C1B............................................................................................................ 2-2
Specifications – IO-320-B1E, -D1C............................................................................................................ 2-3
Accessory Drive Ratio..................................................................................................................................2-3
Detail Weights .............................................................................................................................................. 2-3
This Page Intentionally Left Blank.
LYCOMING OPERATOR’S MANUAL SECTION 2
IO-320 SERIES SPECIFICATIONS
SECTION 2
SPECIFICATIONS
The model specifications shown on the following pages of this section are divided according to model
designation. When differences among models can be clearly stated, the specifications of more than one
model are combined in a single group; otherwise each model has its specifications listed separately. Also, as
additional models are added to this series, new specification pages containing data pertinent to the new
models will be added.
2-1
SECTION 2 LYCOMING OPERATOR’S MANUAL
SPECIFICATIONS IO-320 SERIES
SPECIFICATIONS
IO-320-A1A, -A2A, -E1A, -E1B, -E2A, -E2B
FAA Type Certificate ................................................................................................................................. 1E12
Rated horsepower...........................................................................................................................................150
Rated speed, RPM........................................................................................................................................2700
Bore, inches.................................................................................................................................................5.125
Stroke, inches..............................................................................................................................................3.875
Displacement, cubic inches.........................................................................................................................319.8
Compression ratio ....................................................................................................................................... 7.0:1
Firing order ............................................................................................................................................. 1-3-2-4
Spark occurs, degrees BTC..............................................................................................................................25
Valve rocker clearance (hydraulic tappets collapsed) ......................................................................... .028-.080
Propeller drive ratio ....................................................................................................................................... 1:1
Propeller drive rotation (viewed from rear) ........................................................................................Clockwise
IO-320-B1A, -B1B, -B1C, -B1D, -B2A, -D1A, -D1B; AIO-320; LIO-320
FAA Type Certificate ................................................................................................................................. 1E12
Rated horsepower...........................................................................................................................................160
Rated speed, RPM........................................................................................................................................2700
Bore, inches.................................................................................................................................................5.125
Stroke, inches..............................................................................................................................................3.875
Displacement, cubic inches.........................................................................................................................319.8
Compression ratio ....................................................................................................................................... 8.5:1
Firing order* ........................................................................................................................................... 1-3-2-4
Spark occurs, degrees BTC..............................................................................................................................25
Valve rocker clearance (hydraulic tappets collapsed) ......................................................................... .028-.080
Propeller drive ratio ....................................................................................................................................... 1:1
Propeller drive rotation
All but LIO-320 Series......................................................................................................................Clockwise
LIO-320 Series......................................................................................................................Counterclockwise
IO-320-C1A, -C1B
FAA Type Certificate ................................................................................................................................. 1E12
Rated horsepower...........................................................................................................................................160
Rated speed, RPM........................................................................................................................................2700
Bore, inches.................................................................................................................................................5.125
Stroke, inches..............................................................................................................................................4.375
Displacement, cubic inches.........................................................................................................................319.8
Compression ratio ....................................................................................................................................... 8.5:1
Firing order* ........................................................................................................................................... 1-3-2-4
Spark occurs, degrees BTC..............................................................................................................................25
Valve rocker clearance (hydraulic tappets collapsed) ......................................................................... .028-.080
Propeller drive ratio ....................................................................................................................................... 1:1
Propeller drive rotation
All but LIO-320 Series......................................................................................................................Clockwise
LIO-320 Series......................................................................................................................Counterclockwise
* - LIO-320 Series Only
2-2
LYCOMING OPERATOR’S MANUAL SECTION 2
IO-320 SERIES SPECIFICATIONS
SPECIFICATIONS (CONT.)
IO-320-B1E, -D1C
FAA Type Certificate ................................................................................................................................. 1E12
Rated horsepower...........................................................................................................................................160
Rated speed, RPM........................................................................................................................................2700
Bore, inches.................................................................................................................................................5.125
Stroke, inches..............................................................................................................................................4.875
Displacement, cubic inches.........................................................................................................................319.8
Compression ratio ....................................................................................................................................... 8.5:1
Firing order ............................................................................................................................................. 1-3-2-4
Spark occurs, degrees BTC..............................................................................................................................25
Valve rocker clearance (hydraulic tappets collapsed) ......................................................................... .028-.080
Propeller drive ratio ....................................................................................................................................... 1:1
Propeller drive rotation (viewed from rear) ........................................................................................Clockwise
*Accessory Drive Drive Ratio **Direction of Rotation
Starter 13.556:1 Counterclockwise
Starter 16.556:1 Counterclockwise
Generator 1.910:1 Clockwise
Generator 2.500:1 Clockwise
Alternator 3.250:1 Clockwise
Tachometer 0.500:1 Clockwise
Magneto 1.000:1 Clockwise
Vacuum Pump 1.300:1 Counterclockwise
Prop. Gov. AN20010
Mounted on Accy. Hsg. 0.866:1 Clockwise
Mounted on Crankcase 0.895:1 Clockwise
Fuel Pump AN20003 1.000:1 Counterclockwise
Dual Drives
* - When applicable.
** - Viewed facing drive pad.
NOTE that LIO-320 series engines will have opposite rotation to the above.
DETAIL WEIGHTS
1. Engine, Standard, Dry Weight.
Includes fuel injector, magnetos, spark plugs, ignition harness, intercylinder baffles, tachometer drive,
starter and generator (alternator) drive, starter and generator (alternator) with mounting bracket.
2-3
SECTION 2 LYCOMING OPERATOR’S MANUAL
SPECIFICATIONS IO-320 SERIES
DETAIL WEIGHTS (CONT.)
IO-320 SERIES
LBS.
-A1A, -A2A ...................................................................................................................................................280
-E1B ...............................................................................................................................................................283
-B1B, -E1A, -E2A, -E2B ...............................................................................................................................285
-B1A, -B2A, -B1C .........................................................................................................................................287
-B1D...............................................................................................................................................................288
-D1A ..............................................................................................................................................................291
-D1B...............................................................................................................................................................293
-C1A...............................................................................................................................................................301
-D1C...............................................................................................................................................................306
-B1E ...............................................................................................................................................................307
-C1B...............................................................................................................................................................313
AIO-320 SERIES
LBS.
-A1A, -A2A ...................................................................................................................................................306
-A1B, A2B, -B1B, -C1B................................................................................................................................307
2-4
LYCOMING OPERATOR’S MANUAL
SECTION 3
OPERATING INSTRUCTIONS
Page
General.......................................................................................................................................................... 3-1
Prestarting Items of Maintenance.............................................................................................................. 3-1
Starting Procedures..................................................................................................................................... 3-1
Cold Weather Starting ................................................................................................................................ 3-2
Ground Running and Warm-Up................................................................................................................3-2
Ground Check.............................................................................................................................................. 3-3
Operation in Flight ...................................................................................................................................... 3-4
Fuel Mixture Leaning Procedure........................................................................................................... 3-4
Leaning to Exhaust Gas Temperature Gage..................................................................................... 3-4
Leaning to Flowmeter..........................................................................................................................3-5
Leaning with Manual Mixture Control.............................................................................................3-5
Engine Flight Chart..................................................................................................................................... 3-5
Operating Conditions .................................................................................................................................. 3-6
Engine Shut Down .......................................................................................................................................3-7
Performance Curves.................................................................................................................................... 3-9
This Page Intentionally Left Blank.
LYCOMING OPERATOR’S MANUAL SECTION 3
IO-320 SERIES OPERATING INSTRUCTIONS
SECTION 3
OPERATING INSTRUCTIONS
1. GENERAL. Close adherence to these instructions will greatly contribute to long life, economy and
satisfactory operation of the engine.
NOTE
YOUR ATTENTION IS DIRECTED TO THE WARRANTIES THAT APPEAR IN THE
FRONT OF THIS MANUAL REGARDING ENGINE SPEED, THE USE OF SPECIFIED
FUELS AND LUBRICANTS, REPAIRS AND ALTERATIONS. PERHAPS NO OTHER ITEM
OF ENGINE OPERATION AND MAINTENANCE CONTRIBUTES QUITE SO MUCH TO
SATISFACTORY PERFORMANCE AND LONG LIFE AS THE CONSTANT USE OF
CORRECT GRADES OF FUEL AND OIL, CORRECT ENGINE TIMING, AND FLYING
THE AIRCRAFT AT ALL TIMES WITHIN THE SPEED AND POWER RANGE SPECIFIED
FOR THE ENGINE. DO NOT FORGET THAT VIOLATION OF THE OPERATION AND
MAINTENANCE SPECIFICATIONS FOR YOUR ENGINE WILL NOT ONLY VOID YOUR
WARRANTY BUT WILL SHORTEN THE LIFE OF YOUR ENGINE AFTER ITS WARRANTY
PERIOD HAS PASSED.
New engines have been carefully run-in by Lycoming; therefore, no further break-in is necessary insofar
as operation is concerned; however, new or newly overhauled engines should be operated on straight
mineral oil for a minimum of 50 hours or until oil consumption has stabilized. After this period, a change to
an approved additive oil may be made, if so desired.
NOTE
Cruising should be done at 65% to 75% power until a total of 50 hours has accumulated or
oil consumption has stabilized. This is to ensure proper seating of the rings and is applicable
to new engines, and engines in service following cylinder replacement or top overhaul of one
or more cylinders.
The minimum fuel octane rating is listed in the flight chart, Part 8 of this section. Under no circumstances
should fuel of a lower octane rating or automotive fuel (regardless of octane rating) be used.
2. PRESTARTING ITEMS OF MAINTENANCE. Before starting the aircraft engine for the first flight of the
day, there are several items of maintenance inspection that should be performed. These are described in
Section 4 under Daily Pre-Flight Instruction. They must be observed before the engine is started.
3. STARTING PROCEDURES.
The following starting procedures are recommended, however, the starting characteristics of various
installations will necessitate some variation from these procedures.
NOTE
Cranking periods must be limited to ten (10) to twelve (12) seconds with a five (5) minute
rest between cranking periods.
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SECTION 3 LYCOMING OPERATOR’S MANUAL
OPERATING INSTRUCTIONS IO-320 SERIES
a. Fuel Injected Engines (Cold).
(1) Perform preflight inspection.
(6) Open throttle wide open, move until a slight but steady flow is
noted (approximately 3 to 5 second
(8) Open throttle ¼ of travel.
(9) Set magneto selector switch. (Consult airf
(10) Engage starter.
(12) Move mixture control slowly
(13) Check oil pressure gage. If minimum oil pressure is not indicated within thirty seconds, stop
engine and determine trouble.
b. Fuel Injected Engines (Hot). Because of the fact that the fuel percolates and the system must be
cleared of vapor, it is recommended that the same procedure be used as outlined for cold engine start.
4. COLD WEATHER STARTING. During extreme cold weather, it may be necessary to preheat the engine
and oil before starting.
5. GROUND RUNNING AND WARM-UP.
The engines covered in this manual are air-pressure cooled and depend on the forward speed of the aircraft
to maintain proper cooling. Particular care is necessary, therefore, when operating these engines on the
ground. To prevent overheating, it is recommended that the following precautions be observed.
NOTE
Any ground check that requires full throttle operation must be limited to three minutes, or
less if the indicated cylinder head temperature should exceed the maximum stated in this
manual.
3-2
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