1.5 Flywheel Housing
DETROIT DIESEL 53
c. Tap the front end of the crankshaft with a
soft hammer or pry it with a pry bar to
ensure end play is in one direction only.
b. Position the dial indicators straight and
square with the flywheel housing and
d. Adjust each dial indicator to read zero at
make sure each indicator has adequate
the twelve o'clock position. Then, rotate
travel in each direction.
the crankshaft one full revolution, taking
readings at 45 intervals (8 readings each
on the flywheel housing bore and bolting
Stop and remove the
wrench or cranking bar before recording
each reading to ensure accuracy. The
maximum total indicator reading must not
exceed .013" for either the bore or face.
e. If the run-out exceeds the maximum
limits, remove the flywheel housing and
check for dirt or foreign material (such as
old gasket material) between the flywheel
housing and the end plate and between
the end plate and the cylinder block.
f. Reinstall the flywheel housing and tighten
the attaching bolts in the proper sequence
recheck the run-out. If necessary, replace
the flywheel housing.
Fig. 5 - Checking Flywheel Housing Concentricity with
Tool J 9737
1970 General Motors Corp.