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5-24 ENGINE TOP END
Valves
Valve Seat Inspection
•
Remove the valve (see Valve Removal).
•
Check t
he 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 diam eter is too large or too small, repair t he
seat (see Seat Repair).
Valve Seating Surface Outside Diameter
Standard:
Inle
t
29.4 ∼ 29.6 mm ( 1.1575 ∼ 1.1654 in.)
Exhaust
25.2 ∼25.4 mm (0.992 ∼ 1.000 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:
Inlet
0.5 ∼ 1.0 mm (0.020 ∼ 0.039 in.)
Exhaust
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 C utter Holder, 4.5: 57001–1330[B]
Valve Seat Cutter Holder Bar: 57001–1128[C]
[For Inlet Valve Seat]
Valve Seat Cutter, 45° -
32: 57001–1115
Valve Seat Cutter, 32° -
30: 57001–1120
Valve Seat Cutter, 60° -
33: 57001–1334
[For Exhaust Valve Seat]
Valve Seat Cutter, 45° -
27.5: 57001–1114
Valve Seat Cutter, 32° -
28 : 57001–1119
Valve Seat Cutter, 60° -
30: 57001–1123
If the manufacturer’s instructions are not available, use
the following procedure.