Yamaha EF1000iS, Service Manual

Page: 65 / 109

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CYLINDER (CRANKCASE 1) AND VALVE
a
b
a
b
3
2
1
CYLINDER (CRANKCASE 1) INSPECTION
1. Measure:
9
Cylinder inside diameter
NOTE:
Take side to side
a
and front to back
b
mea-
surements at each of the three locations A, B,
C (total of six measurements), and then find
the average of the measurements.
Out of specification
→
Replace.
VALVE AND VALVE SPRING ASSEMBLY
1. Install:
9
Valve
1
9
Valve spring
2
9
Valve spring retainer
3
NOTE:
9
Apply a small amount of molybdenum disul-
fide oil to the valve stem and use the valve
spring compressor 5 to install the parts.
9
Press the spring retainer by your finger
while installing the spring retainer.
ENG
Maximum wear = Maximum A, B, C.
Cylinder taper =
Maximum A – Minimum C.
Cylinder inside diameter:
41.00 ~ 41.02 mm
(1.614 ~ 1.615 in)
Cylinder inside diameter wear
limit:
41.10 mm (16.18 in)
Cylinder taper limit:
0.05 mm (0.002 in)
7VV10-03 02.10.4 10:39 AM Page 35