Cub Cadet Challenger 500, Service Manual

Page: 69 / 244

Periodic Maintenance
3 ‐ 5
Maintenance and Adjustment of the UV
4. To adjust:
1. Loosen the lock nut (1).
2. Insert feeler gauge of proper
thickness for valve clearance (2).
(Within range for Intake or
Exhaust, whichever is being
adjusted).
3. Rotate the adjuster (3) clockwise or
counter clockwise to achieve a
slight drag with feeler gauge.
4. While holding the adjuster steady
lock down the locknut (4).
Note:
The adjuster cannot move or your
adjustment will not be correct.
5. It is always a good idea to rotate the
crankshaft 2 full revolutions and
recheck your measurements.
6. Re-adjust if necessary.
Reassembly is in reverse order.
1. Timing Plug cover
2. Engine fan components
3. Fan cover
4. Spark Plug
5. Valve covers (Intake and Exhaust).
Checking the Spark Plug
1. Lift the cargo bed up.
2. Remove the spark plug cap (1).
3. Remove the spark plug.
Check the following:

Correct spark plug
type, if incorrect,
replace.