3-44 ENGINE
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.
" 09916-10911: Valve lapper set
If the seat width
W measured exceeds the standard value, or
seat width is not uniform reface the seat using the seat cutter.
& Valve seat width
W
Standard: 0.9 – 1.1 mm (0.035 – 0.043 in)
VALVE SEAT SERVICING
The valve seats
1 for both the intake valve
2 and exhaust
valve
3 are machined to four different angles. The seat contact
surface is cut at 45 °.
" 09916-21111: Valve seat cutter set
09916-22430: Valve seat cutter (N-128)
09916-20640: Solid pilot (N-100-4.5)
NOTE:
* The valve seat cutters (N-121), (N-122) and (N-111) are
included in the valve seat cutter set (09916-21111).
* Use the solid pilot (N-100-4.5) along with the valve seat cutter.
#
• When installing the solid pilot
1, rotate it slightly. Seat the
pilot snugly. Install the 45 ° cutter, attachment and T-handle.
INTAKE EXHAUST
15 ° N-121
30 ° N-128
45 ° N-128 N-122
60 ° N-111 N-111
15 ˚
45 ˚
60 ˚
30 ˚
45 ˚
60 ˚
The valve seal contact area must be inspected after
each cut.
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