Tohatsu MFS 25 — ремонт и коррекция седла клапана: пошаговое руководство [151/319]

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25/30 2006

13) 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.

30˚

a Carbon build-up or uneven surface.

3. Use 30 degree cutter to adjust contact position of valve seat

upper end.

b 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.

60˚

b Width before correction

MFS25_30_ch05.qxd 06.3.9 4:48 PM ページ 35