®
DIESEL ENGINE COMPRESSION
TESTER SET
93039
OPERATING INSTRUCTIONS
3491 Mission Oaks Blvd., Camarillo, CA 93011
Visit our Web site at http://www .harborfreight.com
TO PREVENT SERIOUS INJURY,
READ AND UNDERSTAND ALL WARNINGS
AND INSTRUCTIONS BEFORE USE.
Copyright© 2005 by Harbor Freight Tools® . All rights reserved. No portion of this manual or
any artwork contained herein may be reproduced in any shape or form without the express
written consent of Harbor Freight T ools.
For technical questions and replacement parts, please call 1-800-444-3353.
SPECIFICATIONS TABLE
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SAVE THIS MANUAL
Y ou will need this manual for the safety warnings and precautions, applications
instructions, inspection, maintenance, and c leaning procedures. Keep y our in voice
with this manual. Write the in voice number on the inside of the fr ont cover . Keep this
manual and inv oice in a saf e and dry place for future reference.
GENERAL SAFETY WARNINGS AND PRECAUTIONS
1. KEEP WORK AREA CLEAN AND DRY. Cluttered, damp or wet work areas invite
injuries.
2. KEEP CHILDREN AWAY FROM WORK AREA. Do not allow children to handle
this product.
3. STORE IDLE EQUIPMENT . When not in use, tools and equipment should be stored
in a dry location to inhibit rust. Always lock up tools and equipment and keep out of
reach of children.
4. DO NOT USE THIS PRODUCT IF UNDER THE INFLUENCE OF ALCOHOL OR
DRUGS. Read warning labels on prescriptions to determine if your judgment or
reflexes are impaired while taking drugs. If there is any doubt, do not attempt to use
this product.
5. USE EYE PRO TECTION. Wear ANSI approv ed safety impact goggles when using
this product.
6. DRESS SAFELY . Nonskid footwear or safety shoes should be used when working
with this product. Do not wear loose clothing or jewelry as they can become caught
in moving parts. Wear a protectiv e hair covering to prev ent long hair from becoming
caught in moving parts.
7. INDUSTRIAL APPLICATIONS MUST FOLLOW OSHA REQUIREMENTS.
8. DO NOT OVERREACH. Keep proper footing and balance at all times to prevent
tripping, falling, back injury, etcetera.
9. STA Y ALER T. Watch what y ou are doing at all times. Use common sense. Do not
use this product when you are tired or distracted from the job at hand.
10. CHECK FOR DAMA GED PARTS. Bef ore using this product, carefully check that it
will operate properly and perform its intended function. Check for damaged parts
and any other conditions that may affect the operation of this product. Replace or
repair damaged or worn parts immediately.
Page 2SKU 93039 For technical questions, please call 1-800-444-3353.
11. REPLACEMENT PARTS AND A CCESSORIES. When servicing, use only identical
replacement parts. Only use accessories intended for use with this product.
Approved accessories are available from Harbor Freight Tools.
12. MAINT AIN THIS PRODUCT WITH CARE. Keep this tool clean and dry for better
and safer performance.
13. MAINTENANCE: For your safety, service and maintenance should be performed
regularly by a qualified technician.
14. USE THE RIGHT PRODUCT FOR THE RIGHT JOB. There are certain applications
for which this product was designed. Do not use small equipment, tools or attachment
to do the work of larger industrial equipment, tools or attachments. Do not use this
product for a purpose for which it was not intended. NOT FOR OXYGEN SERVICE
USE.
15. PRIOR TO USING THIS PRODUCT, READ AND ADHERE TO ALL
INSTRUCTIONS AND SAFETY PRECA UTIONS AS OUTLINED IN THE VEHICLE
MANUF ACTURER’S MANU AL AND ENGINE DIA GNOSTIC/REP AIR MANU ALS.
16. ALWAYS RELEASE THE PRESSURE PROPERLY USING THE PRESSURE
RELEASE VALVE (see page 4) BEFORE DISCONNECTING THE ADAPTER.
17. USE EXTREME CARE AROUND HOT OR MOVING ENGINE PARTS.
18. DO NOT EXCEED THE MAXIMUM PRESSURE CAP A CITY OF THIS TOOL (1,000
PSI /70 BAR). Exceeding the maximum pressure capacity could cause serious
personal injury and/or property damage.
19. USE THE COMPRESSION TESTER ONLY IN WELL VENTILATED AREAS. A
running engine produces carbon monoxide. Carbon monoxide is a colorless,
odorless, gas that, if inhaled, can cause serious injury or death.
20. WHEN WARMING UP AN ENGINE IN PREPARATION FOR COMPRESSION
TESTING, MAKE SURE THE VEHICLE’S TRANSMISSION IS PLACED IN
“PARK”, (OR NEUTRAL FOR A MANUAL TRANSMISSION) AND THE
EMERGENCY BRAKE IS APPLIED.
21. WARNING: The br ass components of this product contain lead, a chemical known
to the State of California to cause cancer and birth defects (or other reproductive
harm). (California Health & Safety Code §
25249.5 et seq.
)
UNPACKING
When unpacking, check to mak e sure the parts listed on the next page of this manual
are included. If any parts are missing or broken, please call Harbor Freight Tools at the
number shown on the cover of this manual as soon as possible.
Page 3SKU 93039 For technical questions, please call 1-800-444-3353.
PARTS LIST / ASSEMBLY DIAGRAM
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Gauge (1)
NOTE: Some parts are listed and shown for illustration purposes only, and are not available individually as replacement parts.
Pressure
Release
Valve
Page 4SKU 93039 For technical questions, please call 1-800-444-3353.
PLEASE READ THE FOLLOWING CAREFULLY
THE MANUF ACTURER AND/OR DISTRIBUTOR HAS PR OVIDED THE PARTS DIAGRAM IN THIS MANU AL AS A
REFERENCE T OOL ONL Y. NEITHER THE MANUF ACTURER NOR DISTRIB UTOR MAKES ANY REPRESENTA TION
OR WARRANTY OF ANY KIND TO THE BUYER THAT HE OR SHE IS QUALIFIED TO MAKE ANY REP AIRS TO THE
PRODUCT OR THAT HE OR SHE IS QUALIFIED TO REPLACE ANY PARTS OF THE PRODUCT. IN FACT, THE
MANUFACTURER AND/OR DISTRIBUTOR EXPRESSLY STATES THAT ALL REPAIRS AND PARTS
REPLACEMENTS SHOULD BE UNDERTAKEN BY CERTIFIED AND LICENSED TECHNICIANS AND NOT BY
THE BUYER. THE BUYER ASSUMES ALL RISK AND LIABILITY ARISING OUT OF HIS OR HER REPAIRS T O THE
ORIGINAL PRODUCT OR REPLACEMENT PARTS THERETO , OR ARISING OUT OF HIS OR HER INST ALLATION
OF REPLACEMENT PARTS THERETO.
PRODUCT OVERVIEW
The Engine Compression Test Set measures cylinder pressure on diesel-equipped
cars and trucks. The Gauge (1) features a release valve, 16” of high pressure hose, a dial
reading from 0-1,000 PSI, a 0-70 bar, and a quic k coupler for conv enient connection to the
Adapters (2-5).
Hose
Adapter (3)
collar
and
Coupler
(1)
ADAPTER CONNECTION/REMOVAL
1. Pull the collar at the end of the Coupler (1) away from the opening of the
hose and insert the end of the correct Adapter (2-5) for your application.
2. Let go of the collar and press the Adapter into the Coupler until the collar
moves forward.
3. Pull on the Adapter (2-5) to ensure that it is properly connected to the Coupler .
The Adapter is ready for use.
4. After use, release all pressure in the tool using the pressure release valve
(see page 4) and remove the Adapter (2-5) from the engine. Carefully clean
the Adapter and Gauge Assembly (1). Pull the collar back and remove the
Adapter. Store all parts in the provided case.
Page 5SKU 93039 For technical questions, please call 1-800-444-3353.
TESTING PROCEDURES
Due to the variations in engine design and testing
procedure, it is beyond the scope of this manual to cover
all possible testing procedures.
ALWAYS REFER TO AND CAREFULLY ADHERE TO THE
APPROPRIATE ENGINE MANUFACTURER’S
INSTRUCTIONS FOR USING THIS KIT.
INSPECTION, MAINTENANCE, AND CLEANING
1. Before each use, inspect the general condition of the Compression Tester. Check
for broken, cracked, or bent parts, loose or missing parts, and any condition that
may affect the proper operation of the product. If a problem occurs, have the problem
corrected before further use.
Do not use damaged equipment.
2. When cleaning, use a clean cloth with a mild detergent. Do not use solvents, as
damage to the Compression Tester may result. Do not immerse the Gauge (1) in
any liquid. Then, store the Compression Tester inside the case in a safe, dry location
out of reach of children.
3. WARNING! All maintenance, service, or repairs not listed in this manual are
only to be attempted by a qualified service technician.
Page 6SKU 93039 For technical questions, please call 1-800-444-3353.
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