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T65 Series Vertical Shaft Engines

Crankshaft inspection

1. Inspect the crankshaft journals for galling, scoring,

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

10.8.

3. Inspect the crankpin for galling, scoring, pitting or

any other form of damage.

4. Measure the crankpin using a vernier caliper or a

micrometer. See Figure 10.9.

5. Check the crankshaft for straightness by measuring

the run out. The crankshaft run out can be checked

by:

5a. Place the crankshaft 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 crankshaft.

5c. Slowly turn the crankshaft while watching the

dial indicator.

NOTE: Stop the crankshaft before the dial indicator

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

crankshaft.

6. Inspect the timing gear for wear or damage.

NOTE: The timing gear can be removed from the

crankshaft and replaced if worn or damaged.

See Figure 10.10.

Figure 10.8

Bearing contact

area

Figure 10.9

Crankpin

Figure 10.10

Timing gear

MTD T65 Series User Manual

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