42
LYC040
2. If damaged, the camshaft must be replaced.
VALVE ASSEMBLY
Removing Valves
NOTE: Index all valves, springs, and keepers to
their original position when removing. When install-
ing, all valve components should be installed in their
original position.
1. Using a valve spring compressor, compress the valve
spring (A) and remove the valve keepers (B).
Account for an upper spring cup (C).
2. Remove the valve seal (D) and the lower spring
retainer (E). Discard the valve seal.
NOTE: The valve seal must be replaced.
3. Remove the valve spring; then invert the cylinder
head and remove the valve (F).
LYC027
LYC028
LYC029
Measuring Valve Guide (Bore)
1. Insert a snap gauge halfway down into each valve
guide bore; then remove the gauge and measure it
with a micrometer.
2. Acceptable inside diameter range must be within
specifications.
3. If a valve guide is out of tolerance, the cylinder head
must be replaced.
Servicing Valves/Valve Guides/Valve
Seats
If valves, valve guides, or valve seats require servicing or
replacement, it is recommended that the components be
taken to a qualified machine shop for servicing.
Installing Valves
1. Insert each valve (F) into its original location on the
bottom of the cylinder head.
CAUTION
If valves are discolored or pitted or if the seating sur-
face is worn, the valve must be replaced. Do not
attempt to grind the valves or severe engine damage
may occur.
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