Mallory Ignition 15100, 15120 User Manual

WORK SAFELY!

Installation of this safety bellhousing requires working
underneath vehicle. USE EXTREME C AU TION W H E N
WORKING UNDERNEATH THE VEHICLE. Never get
near or underneath the vehicle until you are confident
that it is safely supported and will not move or fall from
its raised position. DO NOT USE A BUMPER JACK!

PREPARATION FOR INSTALLATION

1. Place the vehicle on a solid, level surface such as a
garage floor to ensure safe installation.

2. Raise the vehicle using appropriate lifting device and
support it using automotive approved support stands
having adequate load capacity.

3. Disconnect the negative (-) cable from the battery.

CAUTION: DO NOT BEGIN THIS INSTALLATION UNTIL
YOU ARE CONFIDENT THAT THE VEHICLE IS SECURE
AND SAFELY SUPPORTED!

Installation Instructions

1. Remove driveshaft, starter motor, transmission and
stock bellhousing.

2. Re m o ve pressure plate and clutch disc from flywheel.

3. At this point, we recommend that you check your
Lakewood Safety Bellhousing for proper alignment with
the crankshaft. This is not a difficult procedure.
Detailed instructions outlining the necessary steps a l o n g
with recommendations for correcting any misalignment are
included in these instructions.

4. After checking and correcting bellhousing alignment,
remove flywheel and install blockplate. Use blockplate
as is (the round hole in the blockplate will correctly
locate the starter nose assuring proper alignment).
Install blockplate over the crankshaft flange and place
over dowel pins in the block.

I M P O RTA N T: In order to comply and meet S.F. I .
bellhousing specification 6.1, it is mandatory that the
safety blockplate be installed with this bellhousing and
all containment fasteners supplied be used in their
correct location (see illustration).

5. Reinstall flywheel and clutch assembly. Be sure to
tighten fasteners using manufacturers recommended
torque specifications.

Note: We recommend the use of Mr. Gasket Ultra-Seal
premium fasteners for clutch and flywheel installation.
Flywheel bolts Mr. Gasket #912
Pressure plate bolts Mr. Gasket #910

I M P O R TA N T: Do not reuse the factory cast iron
flywheel! A high performance quality billet flywheel that
meets S.F.I. specifications is recommended for safety
purposes. Hays off e r s a complete line of high
performance clutches and flywheels to meet safety
requirements.

6. Remove clutch release bearing fork and pivot ball
from stock bellhousing. Reinstall the pivot ball into the
Lakewood bellhousing and attach fork clip onto the
pivot ball. Note: It is recommended to use Lakewood
#15501 Adjustable Pivot Ball in order to obtain the
proper fork geometry. A Heavy-Duty Clutch Fork #15500
is also available to fit most applications.

7. Position your Lakewood Bellhousing over the flywheel/
clutch assembly and slide onto dowel pins in engine
block. Fasten the bellhousing to the engine block using
the 3/8”-16 x 1” (35 ft lbs of torque) and 1/2” bolts (100­110 ft lbs) grade 8 bolts supplied. Secure the blockplate
to the bellhousing using the supplied grade 8 fasteners
installed in the order shown on the illustration.

IMPORTANT: All fasteners must be used in their proper
location for the bellhousing to meet S.F.I. specification 6.1

8. Replace starter motor, transmission and driveshaft.
Attach clutch linkage and check for proper adjustment.

9. Reconnect battery cable.

INSTALLATION INSTRUCTIONS

Lakewood Safety Bellhousing

Oldsmobile, Buick and Pontiac Applications

#15100 and #15120

NOTICE: This safety bellhousing meets S.F.I. (Safety Foundation Institute) specification 6.1 when used

with the enclosed engine block plate and maximum containment fasteners supplied. It is highly

recommended that an S.F.I. approved flywheel and clutch assembly be used in conjunction

with this bellhousing for additional safety precautions.

For this product to meet SFI specification 6.1 the fasters listed below must be used.

LAKEWOOD 15120 SERIES FASTENER REQUIREMENT

BUICK 400-455 V8 AND ALL NON CABLE OPERATED RWD V6

A = 1/2-13 X 1” GRADE 8 BOLTS, WASHERS AND NUTS

B = BELLHOUSING LOCATING PINS (NOT INCLUDED)

C = 3/8-16 X 1” GRADE BOLTS AND WASHERS

D = 3/8-16 X 1” GRADE 8 BOLTS WASHERS AND NUTS

INSTRUCTIONS

1. Remove clutch assembly from flywheel and install
bellhousing on engine block. (It is easier when yo u
l e a ve the clutch assembly off the flywheel.)

2. Install dial indicator base on the flywheel and adjust
plunger to contact the register bore of the housing.
(See photo.)

3 . Rotate the flywheel and note indicator reading.

Misalignment is one-half of the indicator reading
( m a x i m u m allowable is .005”).

4. To correct off-center condition, select the offset
dowel pin pair that is closest to one-half of the
indicator reading. ( i . e., if reading is .016”,
1/2R=.008” use .007” dowels. If reading is .024”,
1/2R=.012” use .014” dowels).

5. Remove stock dowel pins by driving from back side
or pulling with gripper pliers.

6. Clean engine block dowel holes and coat lightly with
lubricant.

7. L u b r icate dowel pins and install in bl o c k . The slot in the
d o wel pins indicates the direction of maximum offset. T h e y
should be installed parallel to one another, and in pairs
(both .007”or both .014” and .021”).

8. Install and tighten bellhousing securely. R e m o u n t
the dial indicator and recheck the register bore runout
(Repeat step 3).

9. To make small corrections or adjustments to the
alignment, you will need to remove the bellhousing
and dri v e the offset dowels out of the bl o ck .

Reposition the dowels using the slot as a reference
point and re-install. Re-check register bore run-out.
Repeat this procedure until the register bore is
within limits.

NOTE: Always be careful when removing bellhousing

from engine block so that offset dowel pins

do not move or change position.

Total One-Half Size Dowel Lakewood
Indicator Total Indicator To Be Offset Dowel
Reading Reading Used Part Number

GM Ford/Mopar

.012” to .020” .006” to .010” .007” #15920 #15950
.022” to .034” .011” to .017” .014” #15930 #15960
.036” to .052” .018” to .026” .021” #15940 #15970

WELD-ON DOWEL LOCATING KIT

Designed for use on race cars that are frequently dis-assembled, this
kit eliminates the need to “ d i a l - i n ” the bellhousing after each remova l .
For Ford or Mopar vehicles with .500” d o wel holes use #15980. Fo r
GM vehicles with .622” d o wel holes use #15981.Welding is required.

Clean paint inside bore.

LAKEWOOD BELLHOUSING

Alignment Procedure

Due to manufacturers’ machining tolerances of engine blocks in relationship to dowel pin
location, it is quite possible for the crankshaft centerline and bellhousing bore to be misaligned. With the
transmission installed in a misaligned condition, several problems can occur, such as pilot bearing and main shaft
bearing wear, difficulty in shifting, and in extreme cases breakage of transmission gears and cases. While most
housings will fall within the allowable limits, it is good insurance to check for register bore runout whenever any
housing or engine block is installed. Most factory service manuals will outline the checking pro c e d u r e, but will not
give correctional measures necessary to ensure tro u b l e - f r ee standard transmission operation, short of trial and
error with switching of various O.E. housings.

O f fset dowel pins are available from Lakewood Industries to ensure correct adapter housing installation. For checking,
you will need a dial indicator (preferably with a magnetic base), a few simple tools and close attention to detail
to give you accurate installation results.

OFFSET DOWEL PIN CHART

RECOMMENDED OPTIONAL LAKEWOOD & HAYS PRODUCTS

• Adjustable Clutch Fork Pivot Ball. This handy item allows adjustment of the clutch fork height when
clutch assemblies are changed.

Lakewood Part #15501

• Safety Block Plates.These plates are exact replacements for those provided in our Lakewood
Bellhousing kits. A must for block protection. These plates are required to meet S.F.I. requirements
for racing.

Please see your Lakewood catalog for one of our many Block Plate part numbers.

• Offset Dowel Pins. Adjustable dowel pins correct for improper alignment of bellhousing to engine
block. A must when accurately dialing in your bellhousing. Please see your Lakewood catalog for

one of our many Offset Dowel Pin part numbers.

• Bellhousing Locating Kit. This kit is used to dial in a misaligned register bore which could cause a
missed shift or premature pilot bearing failure. (Welding required.)

Lakewood Part #15981

• Self-Aligning Throwout Bearing. Designed specifically for installations with clutch to transmission
misalignment resulting in noise and vibration. The Hays bearing minimizes these conditions by
finding the center line.

Please see your HAYS catalog for one of our many Throwout Bearing part numbers.

• Street/Strip Clutch Kits for GM. Designed for high performance and drag racing. This kit features a
pressure plate with heavier springs and centrifugal assist to reduce slippage. The disc features as
aggressive friction material with a high burst strength lining.

Please see your HAYS catalog for one of our many Clutch Kit part numbers.

• Steel & Aluminum Flywheels. All flywheels meet or exceed S.F.I. specifications. Flywheels are
available in a variety of weights, sizes, applications and bolt patterns.

Please see your HAYS catalog for part numbers.

RETAIN THIS INSTRUCTION SHEET FOR FUTURE REFERENCE.

LAKEWOOD IS A DIVISION OF PRESTOLITE PERFORMANCE
10601 MEMPHIS AVE. #12, CLEVELAND, OH 44144

216.688.8300 FAX [phone]

FORM 97140247

11/08

Made in U.S.A.

Printed in U.S.A.