DETROIT DIESEL 53
Flywheel Housing 1.5
NOTE: If the flywheel extends beyond the housing bell, the bore and face must be
checked separately. Use the special adaptor in the tool set to check the housing bore.
c.
Tap the front end of the crankshaft with a soft hammer or pry it toward one end of the block to ensure end play
is in one direction only.
d.
Adjust each dial indicator to read zero at the twelve o'clock position. Then rotate the crankshaft one full
revolution, taking readings at 45 intervals (8 readings each for the bore and the bolting flange face). 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 the 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 the flywheel and tighten the attaching bolts in the proper sequence and to
the specified torque. Then recheck 'he run-out. If necessary, replace the flywheel housing.
14. Install the clutch housing, if used. Tighten the 3/8 "-16 attaching bolts to 30-35 lb-ft torque and the 3/8 "-24 nuts to
35-39 lb-ft torque.
a.
Install tool J 9748 in one of the crankshaft bolt holes.
b.
Install the dial indicator J 8001-3 and position it to read the bore run-out of the housing (Fig. 10). Now check
the run-out by rotating the crankshaft. The run-out should not exceed .008 ".
c.
Reposition the dial indicator to read the face run-out and rotate the crankshaft. The maximum allowable run-
out is .008 ".
d.
If the bore or face run-out is excessive, loosen the housing attaching bolts and nuts slightly and tap the housing
with a soft hammer in the required direction until the run-out is within limits. Tighten the attaching bolts and
nuts evenly to 30-35 and 35-39 lb-ft torque respectively. Then recheck the run-out.
16. Use a new gasket and install the oil pan. Install and tighten the 1/2 "-13 reinforcement bolts.
17. Remove the engine from the overhaul stand and complete assembly of the engine.
November, 1973
SEC. 1.5
Page 5
