Cub Cadet Challenger 550, Service Manual

Page: 71 / 255

3‐6
Periodic Maintenance
Maintenance and Adjustment of the UV
4. To adjust:
1. Loosen the locknut(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 sparkplug
Check the following:
• Correct spark plug type
If Incorrect, replace.