CRANKSHAFT, MAIN BEARINGS, FLYWHEEL & CRANKCASE
For OLD bearings and caps, if the crankshaft,
bearings and crankcase are in good condition,
the bearing running clearance should fall within
If the clearance obtained is more or less
than the specified amount, replace with a
Should the clearance remain excessive, it
For NEW bearings and caps proceed as follows:
Measure the diameter of the crankshaft
journal and record this reading. If it is less
subtract the difference from the virgin lead or Platigage
Subtract the bearing running clearance of
(0.0051 in., )
from the measurement obtained in Step 4a. Mill or grind
this amount from surface "D" (3, Fig. 28) of the new
NOTE: Surface "D" (Fig. 27) must be held square
with the bearing cap bore.
Recheck the bearing running clearance,
with virgin lead or plastigage, to assure
specifications are met.
When acceptable results are achieved for either
old or new parts proceed as follows:
Remove the Plastigage or Virgin lead.
Add clean engine oil to the bearing and
install the center main bearing cap.
Torque the cap screws to 155 N-m (115 lbf-
Check each main bearing in the manner
Continue Crankshaft and Main Bearing installation
Check the crankshaft end clearance as outlined:
Loosen the rear main bearing cap screws.
Hold the crankshaft towards the front of the
engine, using a suitable bar or large
surface is tight against the rear of the thrust
flange of the bearing in the crankcase.
Check the clearance across the bearing
split as shown in Fig. 30.
0.15 mm (0.006 in.)
0.30 mm (0.012 in.)
clearance must be maintained.
Figure 30. - Checking Crankshaft End
PRINTED IN UNITED STATES OF AMERICA