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VALVE SEAT WIDTH INSPECTION
• Visually check for valve seat width on each valve face.
• If the valve face has worn abnormally, replace the valve.
• Coat the valve seat with Prussian Blue and set the valve in
place. Rotate the valve with light pressure.
• Check that the transferred blue on the valve face is uniform all
around and in center of the valve face.
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09916-10911: Valve lapper set
• If the seat width @ measured exceeds the standard value or
seat width is not uniform, reface the seat using the seat cutter.
~
Valve seat width @:
Standard: 0.9 - 1.1 mm (0.035 - 0.043 in)
If the valve seat is out of specification, re-cut the seat.
ENGINE
3·37
VALVE SEAT SERVICING
• The valve seats for both the intake and exhaust valves are
machined to four different angles. The seat contact surface is
cut at 45
o.
----
INTAKE EXHAUST
15 °
----
N-121
30
°
N-126
----
45 °
N-122
N-122
60
°
N-111 N-111
Valve seat
EXHAUST
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09916-21111: Valve seat cutter set
09916-20630: Valve seat cutter (N-126)
09916-20650: Solid pilot (N-100-4.0)
NOTE:
The valve seat cutters (N-121), (N-122)
and
(N-111) are
included in the valve seat cutter
set
(09916-21111).
(CAUTION
I
The valve seat contact area must be inspected after
each cut.