Cub Cadet MTD 70 Series - Manual (Page 112)

61, 65 and 70 Series Vertical Shaft Engines
106
Valves
Valves and valve parts, like springs and keepers, are not available as service parts. The valves and valve seats
can be serviced by grinding and lapping or the head can be replaced. Depending on local machine and labor costs, it
is probably more economical to replace the cylinder head versus servicing the valves.
To service the valves:
NOTE: Servicing valves during the warranty period
will void the warranty. Warranty valve repairs
are to be accomplished by replacing the cyl-
inder head.
1. Remove the cylinder head by following the steps
described earlier in this chapter.
2. Remove the rocker arms by:
2a. Remove the jam nuts.
2b. Remove the fulcrum nut.
2c. Slide the rocker arms off of the rocker studs.
3. Remove the valve retainers by applying light finger
pressure on the valve retainers and sliding them for-
ward. See Figure 9.8.
4. Lift the springs off of the valve stems.
5. Slide the valves out of the cylinder head.
NOTE: Only the intake valve has a valve guide seal.
See Figure 9.9.
NOTE: Inspect the valves for signs of damage. If a
valve is damaged, replace the cylinder head.
Figure 9.8
Figure 9.9