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ENGINE TOP END 5-33
Valves
NOTE
○
The reading is not actual valve/valve guide clearance
because the measuring point is above the guide.
Valve/Valve Guide Clearance (Wobble Method)
Standard:
Exhaust
0.04 ∼ 0.12 mm (0.0016 ∼ 0.0047 in.)
Inlet
0.03 ∼ 0.10 mm (0.0012 ∼ 0.0039 in.)
Service Limit:
Exhaust
0.34 mm (0.013 in.)
Inlet
0.34 mm (0.013 in.)
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 Seat Repair).
Valve Seating Surface Outside Diameter
Standard:
Exhaust
24.9 ∼ 25.1 mm (0.980 ∼ 0.98 8 in.)
Inlet
29.4 ∼ 29.6 mm (1.157 ∼ 1.16 5 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:
Exhaust
0.8 ∼ 1.2 mm (0.031 ∼ 0.047 in.)
Inlet
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 Bar: 57001-1128 [C]
Valve Seat Cutter Holder,
4.5: 57001-1330 [B]
For Exhaust Valve Seat
Valve Seat Cutter, 45° -
27.5: 57001-1114
Valve Seat Cutter, 32° -
28: 57001-1119
Valve Seat Cutter, 60° -
25: 57001-1328
For Inlet Valve Seat
Valve Seat Cutter, 45° -
35: 57001-1116
Valve Seat Cutter, 32° -
35: 57001-1121
Valve Seat Cutter, 60° -
33: 57001-1334
If the manufacturer’s instructions are not available, use
the following procedure.
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