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ENGINE
clearance permissible in the bearing lengthwise, in the
bearing shell, on a film of oil. (Fig. 39) Assemble the
bearing cap and tighten the screws, torquing them to
specifications.  Try to turn the crankshaft by hand to
determine whether or not there is any drag.
Figure 37.
Figure 39.
6. If a definite drag is felt and the piece of feeler
stock is equivalent to, but no more in thickness than the
maximum clearance specified, neither the crankshaft or
bearing is worn excessively as far as clearance is
concerned.
When using new bearings and the
crankshaft is not worn, checking with a piece of feeler
stock as outlined above should lock up the crankshaft,
making it possible to turn only by use of a bar or wrench.
7. The same check can be made by using a piece
of Plastigage.
CAUTION:
When using this method, do not turn
the crankshaft as that would destroy
the Plastigage.  Compare the width
of the plastic material with the gauge
printed on the Plastigage envelope
Figure 38.
(Fig.  40) to determine the bearing
clearance.
be checked. Use a piece of feeler stock 1/2" wide and
approximately 1/8,' shorter than the length of the
8. If crankshaft is scored, or worn enough so that
bearing. Dress all edges carefully to be sure there are
new bearings will not fit with the
no burrs to mark the bearing.
5. Check each bearing, one at a time, by placing
the feeler stock (the thickness of which should be
equivalent to the maximum
B-13

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