Cub Cadet MTD P71 Series - Manual (Page 97)

Crankshaft, piston and connecting rod
91
Crank shaft inspection
1. Inspect the crank shaft 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
10.9.
3. Inspect the crank pin for galling, scoring, pitting or
any other form of damage.
4. Measure the crank pin using a vernier caliper or a
micrometer. See Figure 10.10.
5. Check the crank shaft for straightness by measuring 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 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 crank shaft.
Figure 10.9
Bearing contact
area
Figure 10.10
Crank pin