Support the weight of the flywheel housing using a suitable sling. Lifting eyes can be attached to flywheel
housing on mounting pads.
Remove the twelve attaching bolts located in the flywheel housing. Remove one bolt located behind the small
hole cover on the right hand side of the flywheel housing. Then remove the remaining bolts around the upper
portion of the housing, and the two bolts which go through the rear end plate from the front and thread into
the flywheel housing. Install alining studs J1927-01 to guide the housing until it clears the crankshaft during
Using a soft-faced hammer, strike the front face of the flywheel housing alternately on each side of the
engine to work it off the dowels and away from the cylinder block rear end plate. Take care not to force
blower drive support away from blower drive flange, or to bend cylinder block end plate.
Remove all traces of the old gasket from the cylinder block rear end plate and the flywheel housing.
Support the outer face of the flywheel housing on wood blocks.
Using a hammer and a punch, drive the oil seal out of the housing.
(10) Using a clean cloth, wipe the clean seal bore in the flywheel housing.
Dry cleaning solvent P-D-680 (safety or Stoddards solvent) is potentially dangerous. Avoid repeated and
prolonged breathing of vapors and skin contact with the liquid. Do not use near open flame, arcing
equipment or other ignition sources. Always wear eye protection and protective clothing. The flash point of
P-D-680 Is 100 to 138 deg. F (30 to 59 deg. C).
Wash the flywheel housing using dry cleaning solvent (item 10, Appendix B).
Death or serious injury could occur if compressed air is directed against the skin. Do not use compressed
air for cleaning or drying unless the pressure is/has been reduced to 30 psi (2.11 kg/cm2) or less. When
working with compressed air always use chip guards, eye protection and other personal protective
Dry the flywheel housing using compressed air.
Inspect the flywheel housing for cracks, stripped threads or other damage. Replace flywheel housing as
Inspect the rear end of the crankshaft for wear due to the rubbing action of the oil seal, dirt build up, or
fretting caused by the action of the flywheel. The crankshaft must be clean and smooth, otherwise the oil seal
lip will be damaged when the flywheel housing is reinstalled. If the seal area is grooved, refer to para. 3-8.10
to replace or to install a sleeve over the crankshaft rear boss.