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ENGINE TOP END 5-37
Cylinder Head
Valve Seat Inspection
•
Remove the valve (see Valve Removal).
•
Check the valve seat surface [A] between the valve [B]
and valve seat [C].
○
Measure the outside diameter [D] of the seating pattern
on the valve seat with vernier calipers.
If the outside diameter is too large or too small, repair the
seat (see Seat Repair).
Valve Seat Surface Outside Diameter (Seat O.D.)
Standard: Exhaust 31.9
∼
32.1 mm (1.256
∼
1.264 in.)
Inlet
36.4
∼
36.6 mm (1.433
∼
1.441 in.)
○
Measure the seat width [E] of the portion where there is
no build-up carbon (white portion) of the valve seat with
vernier calipers.
Good [F]
If the width is too wide [G], too narrow [H] or uneven [J],
repair the seat (see Valve Seat Repair).
Valve Seat Surface Width (or Seat Width)
Standard:
Exhaust:
0.5
∼
1.0 mm (0.020
∼
0.039 in.)
Inlet:
0.8
∼
1.2 mm (0.031
∼
0.047 in.)
Valve Seat Repair
•
Repair the valve seat with the valve seat cutters [A].
Special Tools - Valve Seat Cutter Holder,
7: 57001-1126
[B]
Valve Seat Cutter Holder Bar: 57001-1128
[C]
[For Exhaust Valve Seat]
Valve Seat Cutter, 45° – 35: 57001-1116
Valve Seat Cutter, 32° – 35: 57001-1121
(or 32° – 33: 57001 - 1199)
Valve Seat Cutter, 55° – 35: 57001-1247
[For Inlet Valve Seat]
Valve Seat Cutter, 45° – 40: 57001-1496
Valve Seat Cutter, 32° – 38.5: 57001-1122
Valve Seat Cutter, 55° – 38.5: 57001-1497
○
The marks stamped on the back of the cutter [A] represent
the following.
55° ........................... Cutter Angle [B]
37.5 ....................... Outer Diameter of Cutter [C]
If the manufacturer’s instructions are not available, use
the following procedure.