Yamaha EF3000iSE - Inverter Generator - 3000 Maximum AC..., Service Manual

Page: 142 / 327

3-29
ENG
VALVE AND VALVE SPRING REMOVAL
1. Remove:
• Valve cotter
1
• Valve spring retainer
2
• Valve spring
3
• Valve
4
Remove the parts using the valve
spring compressor
5
.
CAUTION:
Do not compress the valve spring more
than necessary.
Valve spring compressor:
YM-01253, 90890-01253
SVU3160J
VALVE AND VALVE SPRING INSPECTION
1. Measure:
• Valve stem length
a
• Valve face diameter
b
Out of specification
→
Replace.
2. Measure:
• Valve stem diameter
a
Out of specification
→
Replace.
Valve stem length:
Intake: 65.9 mm (2.59 in)
Exhaust: 66.2 mm (2.61 in)
Valve face diameter:
Intake: 23.9 ~ 24.1 mm
(0.9409 ~ 0.9488 in)
Exhaust: 21.9 ~ 22.1 mm
(0.8622 ~ 0.8701 in)
Valve stem diameter:
Intake: 5.448 ~ 5.463 mm
(0.2145 ~ 0.2151 in)
Exhaust: 5.440 ~ 5.445 mm
(0.2142 ~ 0.2144 in)
Wear limit:
Intake: 5.418 mm (0.2133 in)
Exhaust: 5.410 mm (0.2130 in)
SVU3170J
SVU3180J
VALVE