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ENGINE TOP E ND 5-23
Valves
Valve S eat Inspection
•
Remove the valve (see Valve Removal).
•
Check the valve seating surface [A] between the valve [B]
and valve seat [C].
○
Measure the outside diameter [D] of the seating pattern
on the valve seat.
If the outside diameter is too large or too small, r epair the
seat (see Seat Repair).
Valve Seating Surface Outside Diameter
Standard:
Inlet
26.4 ∼ 26.6 mm (1.0276 ∼ 1.0472 in.)
Exhaust
21.6 ∼ 21.8 mm (0.850 ∼ 0.858 in.)
○
Measure the seat width [E] of the portion where there is
no build-up carbon (white portion) of the valve seat with a
vernier caliper.
Good [F]
If the width is too wide [G], too narrow [H] or uneven [J],
repair the seat (see Valve Seat Repair).
ValveSeatingSurfaceWidth
Standard:
Inlet 0.5 ∼ 1.0 mm (0.020 ∼ 0.039 in.)
Exhaust 0.5 ∼ 1.0 mm (0.020 ∼ 0.039 in.)
Valve Seat Repair
•
Repair the valve seat with the valve seat cutters [A].
Special Tools - Valve Seat Cutter Holder, 4: 57001–1275 [B]
Valve Seat Cutter Holder Bar: 57001–1128 [C]
[For Inlet Valve Seat]
Valve Seat Cutter, 45° -
27.5: 57001–1114
Valve Seat Cutter, 32° -
28: 57001–1119
Valve Seat Cutter, 60° -
27: 57001–1409
[For Exhaust Valve Seat]
Valve Seat Cutter, 45° -
24: 57001–1113
Valve Seat Cutter, 32° -
25 : 57001–1118
Valve Seat Cutter, 60° -
25: 57001–1328
If the manufacturer ’s instructions are not available, use
the following procedure.