CYLINDER HEAD
90-857138R1 MAY 2000 Page 4A-15
VALVE SEAT RECONDITIONING
Clean the carbon deposits from the combustion chambers and valve seats and check for
pitting.
Several different types of equipment are available for reseating valve seats. Follow the
equipment manufacturer’s instructions.
Measure valve seat width. Resurface the valve seat if not in specification.
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a
a-Valve Seat Width
Valve Seat Width Specification “a”
Standard Value Limit that requires repair
Intake Valve Seat 0.031 in. (0.8 mm) 0.070 in. (1.8 mm) or more
Exhaust Valve Seat 0.031 in. (0.8 mm) 0.070 in. (1.8 mm) or more
To reface valve seat, use a 60°, 45° or 15° cutter and finish with 60° valve seat cutter.
a
a-Valve Seat Cutter
NOTE: Turn cutter clockwise only. Continue turning as cutter is lifted off valve seat
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