FLEXPLATE OR FLYWHEEL, FLYWHEEL HOUSING, AND REAR COVER INSTALLATION (Contd)
New rear main seals have an assembly tool which protects seal lip during shipment and
Do not use any lubricant to install seal. Oil seal must be installed with lip of seal and
crankshaft clean and dry.
New seal (4) (with assembly
a. Install on crankshaft.
Position largest diameter of
assembly tool toward cylinder
b. Push seal (4) from assembly
Remove and discard assembly
tool onto crankshaft.
c. Using crankshaft rear oil seal
Use crankshaft oil seal driver
driver (12), drive seal (4) on
(ST-997) (12). Install pins on
rear cover (M915/Big Cam I) or
driver before using.
cover (M915A1/Big Cam III) (2).
If a new flywheel housing is being installed, dowel pins must be removed from cylinder
block prior to installing housing to prevent damage to housing. The housing must be
doweled with oversize dowel pins after alignment.
Two dowel pins (10)
Remove dowel pins (10) if installing
new flywheel housing (6) and
dowel is damaged or outside
diameter is less than 0.5005 in.
M915/Big Cam I engines are equipped with a wet flywheel housing which utilizes
preformed packings between flywheel housing and cylinder block.
Perform steps 4b and 4c for M915/Big Cam I only.
Flywheel housing (6)
a. Install two flywheel housing
Guide pins are used to support
guide pins on cylinder block (11).
flywheel housing (6) (see Appendix
D, Item 3).
b. For wet-type flywheel
Lubricate preformed packing (9)
housings (M915/Big Cam I), install
with OE/HDO 30 oil prior to
new preformed packing (9) on
If engine is to be tested with dynamometer, preformed packing must not be installed on
crankshaft until after test. Dry-running will destroy this seal.
c. For wet-type flywheel housing
Use an approved gasket adhesive
(M915/Big Cam I), install eleven
to seal preformed packings (5) to
new preformed packings (5) on
flywheel housing (6) and cylinder
flywheel housing (6) (M915/Big
d. Install flywheel housing (6) on
Tighten screws (7) to 10-20 lb-ft
cylinder block (11) with seven
screws (7) and washers (8).