Yamaha EF3000iSE - Inverter Generator - 3000 Maximum AC..., Руководство по обслуживанию, Страница: 146 / 327

3-31
ENG
VALVE
VALVE SEAT INSPECTION
1. Remove carbon deposits from the valve
face and valve seat.
2. Apply a small amount of coarse
Mechanic ’ s blueing dye (Dykem) to the
valve face.
3. Insert the valve into the valve guide and
use a valve lapper to contact the valve
face with the valve seat.
NOTE:
Do not rotate the valve while the valve face is
contacting the valve seat.
4. Measure:
• Valve face contact width
a
Make sure that the contact width along
the entire valve face is within specifica-
tions.
Out of specification/rough/eccentric
wear
→
Replace.
Valve face contact width (intake
and exhaust):
0.9 ~ 1.1 mm (0.0354 ~ 0.0433 in)
Limit: 1.6 mm (0.0630 in)
SVU3240J
5. Measure:
• Valve seat contact width
a
Make sure that the contact width along
the entire valve seat is within specifica-
tions.
Out of specification/rough/eccentric
wear
→
Replace.
Valve seat contact width (intake
and exhaust):
0.9 ~ 1.1 mm (0.0354 ~ 0.0433 in)
Limit: 1.6 mm (0.0630 in)
SVU3250J