Inspection and Reconditioning (Rev 1/97)
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4. After grinding the valves, check the valve margin.
Replace any valve with a valve margin that is less than
.039 in. (1.00 mm).
NOTE: Valves with a valve margin that is not even
after being ground are slightly bent. These valves
should be replaced if the valve margin is less than
.039 in. (1.00 mm) at the narrowest point.
Valve Margin
5. After grinding the valves, install the valves in their
respective valve seats and check the valve depth of
each. Replace any valve that has a valve depth over the
wear limit.
Valve Seats
1. Inspect the valve seats for any major damage that
would require valve seat replacement.
2. Grind each valve seat to remove any sign of wear or
minor damage. Valve seats that show no wear or dam-
age should also be ground lightly to clean up any slight
imperfections. Grind the valve seats to the following
angles:
Intake 30
degrees
Exhaust
45 degrees
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Intake Valve Seat Angles
Exhaust Valve Seat Angles
Measuring Valve Seat Width
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