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6-26 ENGINE TOP END
Valves
Valve Seat 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, repair the
seat (see Valve Seat Repair).
Valve Seating Surface Outside Diame ter
Standard:
Exhaust
27.6 ∼ 27.8 mm (1.087 ∼ 1.094 in.)
Inlet
32.6 ∼ 32.8 mm (1.283 ∼ 1.291 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).
Valve Seating Surface Width
Standard:
Exhaust
0.8 ∼ 1.2 mm (0.03 ∼ 0.047 in.)
Inlet
0.5 ∼ 1.0 mm (0.02 ∼ 0.039 in.)
Valve Seat Repair
•
Repair the valve seat with the valve seat cutters [A].
Special Tools-
Valve Seat Cutter Holder,
5:
57001-1208 [B]
Valve Seat Cutter Holder Bar:
57001-1128 [C]
[For Inlet Valve Seat]
Valve Seat Cutter, 45° -
35:
57001-1116
Valve Seat Cutter, 32° -
35:
57001-1121
Valve Seat Cutter, 55° -
35:
57001-1247
[For Exhaust Valve Seat]
Valve Seat Cutter, 45° -
30:
57001-1187
Valve Seat Cutter, 32° -
30:
57001-1120
Valve Seat Cutter, 60° -
30:
57001-1123
If the manufacturer’s instructions are not available, use
the following procedure.