CRANKSHAFT, MAIN BEARINGS, FLYWHEEL & CRANKCASE
Prior to Crankshaft installation, check the Crankcase for
trueness as follows:
Using a lint-free cloth, wipe the bearing supports
of the crankcase free of oil.
Support the crankcase bottom side up as shown
in Fig. 24 using wooden blocks to level it.
Figure 24. - Crankcase Bottom-Side-Up View
Install the upper halves of the bearings (bearings
with oil hole in center) on the crankcase.
If the original bearings are to be
reinstalled, be sure they go to the
The nibs of the bearings must fit into
the notches in the crankcase bearing
Apply Prussian Blue on the crankshaft main
journals and lower them carefully and evenly
onto the bearings. DO NOT install the bearing
caps and lower bearings.
Rotate the crankshaft approximately one-half
Remove the crankshaft evenly and inspect the
upper bearings for an even transfer of bluing
from journals to bearings.
Replace any bearings that do not show an over-
all even bluing.
NOTE: It is advisable to replace all bearings with
new, if one of the originally used bearings has to be
When satisfied that the crankcase is in good
order and free from any distortion and burrs
around the upper bearing seats proceed as
Clean all bluing from the bearings and
If using the original bearings coat the
bearing surfaces with a small amount
of clean engine oil.
Install the bearing halves (bearing with
oil hole in center).
Carefully install the crankshaft.
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