5-32
Power Unit
4st 9.9/15/20 2008
16) Correction of Valve Seat
1. Use valve seat cutter (commercially available item) to correct
valve seat.
2. Turn 45° degree cutter clockwise to cut valve seat surface to
make it smooth.
45˚
a
30˚
b
aCarbon or uneven surface
3. Use 30° degree cutter to adjust contact position of valve seat
upper end.
bContact width before correction
Be careful not to over-cut valve seat. Turn valve
seat cutter while pushing down evenly.
4. Use 60° degree cutter to adjust contact position of valve seat
lower end.
bContact width before correction
E_MFS20C_ch05_090105.qxd 09.1.20 5:25 PM ページ 32
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