CRANKSHAFT, PISTON AND CONNECTING ROD
69
19. Remove the piston rings from the piston using a
pair of piston ring pliers.
See Figure 10.7.
20. Remove the crankshaft.
NOTE: The crankshaft bearings are pressed
onto the crankshaft and will come out with it.
Figure 10.7
Piston ring pliers
Crankshaft inspection
1. Inspect the crankshaft journals and the crank pin
for galling, scoring, pitting or any other form of
damage.
NOTE: This is mostly a visual check. Measure-
ment is to determine if it is within the specifica-
tions after it is found to be OK visually.
NOTE: The crankshaft and bearing are serviced
as one assembly.
2. Measure the crank pin where the connecting rod
attaches to the crankshaft using a vernier caliper
or a micrometer.
See Figure 10.8.
NOTE: Micrometers are the preferred way to
measure the journals. Measure the center and
the ends to check for tapering or egging.
3. Check the crankshaft for straightness by mea-
suring the run out. The crankshaft run out can be
checked by:
3a. Place the crankshaft on a pair of matched V-
blocks or in the engine block with the sump
installed.
3b. Place a dial indicator at a smooth point at
either end of the crank shaft.
3c. Slowly turn the crank shaft while watching
the dial indicator.
NOTE: Stop the crank shaft before the dial indi-
cator hits the keyway.
3d. Compare the reading on the dial indicator to
the specification listed at the end of this
chapter.
3e. Repeat the above steps on the other end of
the crank shaft.
Figure 10.8
micrometer
Crank pin
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