Cub Cadet MTD P71 Series - Manual (Page 84)

P71 Series Vertical Shaft Engines
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5. Inspect the key, keyway, and tapered mating sur-
faces of the flywheel and crankshaft. See Figure
7.16.
NOTE: If the key is damaged it must be replaced. If
there is damage to the crankshaft key way,
the engine must be short blocked because
crankshafts are not available as a service
part.
IMPORTANT: The taper in flywheel and the on the
crankshaft must be clean and dry.
The flywheel is held in place by the
friction fit between the flywheel and
the crankshaft, not the key. The key
is only to guide the flywheel to the
proper position until it is torqued
down.
6. On installation, confirm that the key is properly
seated (the flat of the key parallel with the threaded
section of the crankshaft) in the key-way, and that
the tapers are fully seated. Key or keyway failure
may result from improper seating.
7. Install a starter cup by placing the starter cup on the
flywheel. Allow the protrusions on the bottom of the
starter cup to rest inside the dimples in the flywheel.
See Figure 7.17.
8. Install the flywheel nut to a torque of 33 - 41 ft lbs
(45 - 55 Nm).
9. If removed, install the ignition module by following
the procedures described in the Ignition Module
section of this chapter.
10. Adjust the air gap by following the steps described
in the ignition module section of this chapter.
11. Reassemble the engine.
12. Test run the engine in a safe area before returning it
to service.
Figure 7.16
Key flat parallel to the threads
Taper
Figure 7.17
Starter cup protrusions
Flywheel dimple