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ENGINE TOP END 4-17
2. Too wide
1 .Good
1. Valve Guide Reamer: 57001-1274
Valve Seat Outside Diameter
.If the outside diameter of the seating pattern on the
valve seat is too large or too small, repair the valve seat.
4. Uneven
3. Too narrow
21.5 ~ 21.7 mm
18.5 ~ 18.7 mm
Valve Seat Outside Diameter
Standard: Inlet :
Exhaust :
Valve Seat Repair {Valve Lapping)
.Using the valve seat cutters (special tools), repair the
valve seat.
Valve Seat Width Inspection
.Check the valve seat width.
O Measure the seat width of the portion where there is no
build-up carbon (white portion) of the valve seat with
a vernier caliper.
Valve Seat Cutters
Inlet Valves: 45° -Q>24.5
32° -Q>25
60° -Q>30
Exhaust Valves: 45° -Q>22
32° -Q>22
60° -Q>30
57001-1113
57001-1118
57001-1123
57001-1205
57001-1206
57001-1123
Holder and Bar
Holder:
Bar:
57001-1275
57001-1128
*If the manufacture's instructions are not available, use
the following procedure.
1.Valve
2. Valve Seat
3. Seating Surface Outside Diameter
4. Valve Seat Width
Valve Seat Width (IN and EX)
Standard: 0.5 --1.0 mm
Seat Cutter Operating Care:
1 .This valve seat cutter is developed to grind the valve for
repair. Therefore the cutter must not be used for other
purposes than seat repair.
2. Do not drop or shock the valve seat cutter, or the
diamond particles may falloff.
3. Do not fail to apply engine oil to the valve seat cutter
before grinding the seat surface. Also wash off ground
particles sticking to the cutter with washing oil.
* If the valve seat width is not within the specified range,
repair the valve seat.