DETROIT DIESEL 53
The flywheel housing is a one-piece casting mounted
against the rear end of the cylinder block. The flywheel
housing provides a cover for the gear train and flywheel
and also serves as a support for the starting motor and
The crankshaft rear oil seal, which is pressed into the
housing, may be removed or installed without removing
the housing (Section 1.3.2).
Remove Flywheel Housing
1. Remove the engine from its base as outlined in
Fig. 2 Location of Shim
2. Remove the starter from the flywheel housing or
6. Remove the blower drive cover the blower drive
shaft retainer ring, and the blower drive shaft;
3. Remove the flywheel.
7. Remove the governor and blower drive support.
4. Remove the oil pan.
8. Remove all of the bolts from the flywheel
5. Remove the fuel pump.
NOTE: When removing the flywheel
housing bolts, note the location of the
various size bolts, lock washers, flat
washers and copper washers so they
may be reinstalled in their proper
9. To guide the flywheel housing until the oil seal
clears the end of the crankshaft, thread two pilot studs J
7540 into the cylinder block (Fig. 1).
10. Thread eyebolts into the tapped holes in the
pads (if provided) on the top or sides of the flywheel
housing, and attach a chain hoist with a suitable sling to
the eyebolts. Then, strike the front face of the housing
alternately on each side of the engine with a soft
hammer to loosen and work it off the dowel pins.
11. Remove all traces of the old gaskets from the
cylinder block rear end plate and the flywheel housing.
Clean and inspect the flywheel housing for cracks or any
other damage. Replace the housing if it is damaged.
Inspect the crankshaft rear oil seal as outlined in Section
Fig. 1. Installing Flywheel Housing
1970 General Motors Corp.
SEC 1.5. Page 1