Chapter 10: Crankshaft, piston and Connecting Rod
90
4. Measure the crankpin using a vernier caliper or
a micrometer. See Figure 10.10.
5. Check the crank shaft for straightness by mea-
suring the run out. The crank shaft run out can
be check by:
5a. Place the crank shaft on a pair of matched
V-blocks or in the engine block with the
sump installed.
5b. Place a dial indicator at a smooth point at
either end of the crank shaft.
5c. Slowly turn the crank shaft while watching
the dial indicator.
NOTE: Stop the crank shaft before the dial indi-
cator hits the keyway.
5d. Compare the reading on the dial indicator to
the specification listed at the end of this
chapter.
5e. Repeat the above steps on the other end of
the crank shaft.
Piston Inspection
1. Clean the piston and remove all carbon from the
rings and ring groves.
2. Insert one ring into the cylinder. Push it down
about one inch from the top. See Figure 10.11.
3. Measure the end gap with a feeler gauge and
compare to the chart at the end of this chapter.
See Figure 10.11.
4. Repeat steps 3 and 4 on the other rings.
NOTE: Piston rings are not available as service
parts. If any of the end gaps are out of spec, the
engine must be short blocked.
5. Install rings back onto the piston.
See Figure 10.12.
Figure 10.10
Crankpin
Figure 10.11
Feeler gauge
Piston ring
Figure 10.12
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