TM 5-3810-300-24-&P-3
1.5
FLYWHEEL HOUSING
The flywheel housing (Fig. 1) is a one-piece casting,
mounted against the rear cylinder block end plate, which
Clean the flywheel housing and inspect it for cracks or
provides a cover for the gear train and the flywheel. It
any other damage.
also serves as a support for the starting motor and the
transmission.
NOTE: The flywheel housing on some
engine models had a 9.603 " radius from the
The crankshaft rear oil seal, which is pressed into the
center of the crankshaft bore to the center of
housing, may be removed or installed without removing
the starter hole. These engines used a 103
the housing (Section 1.3.2).
tooth flywheel ring gear. These flywheel
housings have been replaced by new
The size of the tapped holes in the SAE No. 1 flywheel
housings with a 9.520 " crank-shaft bore to
housings, used for transmission attaching bolts, has
starter hole radius. A 102 tooth flywheel ring
been increased from 3/8"-16 to 7/16"-14 to conform with
gear must be used with-the new housings.
a revision in SAE flywheel housing standards.
The old ring gear is retained for service for
those engines still using the old housing.
Remove Flywheel Housing
It is very important that all old gasket material be
thoroughly removed from the flywheel housing and the
1. Mount the engine on an overhaul stand as outlined in
Section 1.1.
end plate, otherwise runout of the pilot and the face of
the housing may be affected when the housing is
2. Remove the starting motor, oil pan, flywheel and any
installed on the engine.
accessories attached to the flywheel housing.
The steel oil deflector used in the flywheel housing on
3. Remove the two bolts securing the engine lifter
certain former engines is no longer required and is not
bracket to the cylinder head. This will leave the lifter
available for service. It may be discarded at time of
bracket attached to the flywheel housing for conve-
flywheel housing removal.
nience in handling.
4. Remove the twelve attaching bolts inside of the
flywheel housing bell which attach the housing to the
idler gear hub, spacer and cylinder block. Remove the
twelve 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 housing (Fig. 1).
NOTE: When removing the flywheel housing
bolts, note the location of the various bolts
and washers so they may be reinstalled in
their proper location.
5. To guide the flywheel housing until it clears the end
of the crankshaft, thread four pilot studs J 1927-01 into
the cylinder block (Fig. 2).
6. With the flywheel housing supported by a chain hoist
attached to the lifter bracket, strike the front face of the
housing alternately on each side with a soft hammer to
work it off the dowels and away from the cylinder block
Fig. 1 - Typical Flywheel Housing Mounting
rear end plate:
Inspection
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