Section 02 ENGINE
Subsection 10 (CYLINDER HEAD)
V01C1HA
B
A
A. Valve face contact width
B. Valve seat contact width
Valve Seat Grinding
NOTE: The valve seats may be reground with
a valve seat grinder which centers on the valve
guide.
1. Grind the valve seat at 45°. Remove no more
material than absolutely necessary to clean the
seat up.
2. Using a 35° stone, narrow the valve seat until
the appropriate outer diameter is obtained.
A
EXHAUST
80°
45°
35°
80°
45°
35°
R1503motr259A
A. Valve seat outer diameter EXHAUST
R1503motr260A
A
INTAKE
55°
45°
55°
45°
35°
35°
A. Valve seat outer diameter INTAKE
VALVE SEAT
OUTER DIAMETER
Intake 37.35 mm (1.4705 in)
Exhaust 30.3 mm (1.1929 in)
3. Using a 55° stone for the intake and an 80°
stone for the exhaust valve, reduce the valve
seat contact width to the appropriate value
mentioned above.
4. Finally, coat the valve seating surface with a
fine paste of valve grinding compound using a
manual valve grinding mandrel. Lightly grind
the valves until a smooth, even, uniform sealing
surface of the appropriate inside and outside
diameter is obtained on both the valve and
the seat. Use only a hand held valve grinding
mandrel with a suction cup, rotating the valve
back and forth through about 45°, and then
advancing the valve 45° before repeating this
operation.
Valve Installation
For installation, reverse the removal procedure.
Pay attention to the following details.
Inst
all NEW valve stem seal.
smr2009-025 145
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