Cub Cadet Challenger 550, Service Manual

Page: 70 / 255

Periodic Maintenance
3‐5
Maintenance and Adjustments of the UV
Valve Adjustment
1. Remove the following parts:
1. Valve Cover (Intake)(1)
2. Valve Cover (Exhaust)(2)
3. Spark Plug Cap(3)
4. Spark Plug
3. Rotate the crankshaft
counterclockwise until the timing mark
for TDC is aligned in the window
2. Remove the cooling fan
：
1)
Fan cover
2)
Fan impeller
3)
Timing plug cover
Note:
When aligning the timing mark for
TDC, there should be clearance
between the valve tip and the rocker
arm adjusters on both intake and
exhaust valves. If there is no
clearance rotate the crankshaft 1 full
turn to re align the mark. This should
put you on the compression stroke.