CRANKSHAFT, PISTON AND CONNECTING ROD
69
The internal components of the MTD engine are not
available as service parts. The intent of this chapter is
to provide the technician the procedures to examine an
engine and to provide the specification to determine if
an engine is worn out. All of the specifications are listed
in a chart at the end of the chapter.
Crank shaft inspection
1. Inspect the crank shaft journals for galling, scor-
ing, pitting or any other form of damage.
2. Measure the journals at the bearing contact
points using a vernier caliper or a micrometer.
See Figure 10.7.
NOTE: Micrometers are the preferred and most
accurate way to measure the journals.
3. Inspect the crankpin 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.
Figure 10.7
Bearing contact
area
4. Measure the crankpin using a vernier caliper or
a micrometer.
See Figure 10.8.
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.
Figure 10.8
Crankpin
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