Yamaha EF1000iS, Service Manual

Page: 53 / 109

3-23
CRANKSHAFT, PISTON AND PISTON RING
P
a
PISTON AND PISTON PIN INSPECTION
1. Measure:
9
Piston skirt diameter
P
a
= 10 mm (0.4 in) from the piston bottom
edge
Out of specification
→
Replace.
2. Measure:
9
Piston clearance
Out of specifications
→
Rebore or
replace cylinder and replace piston and
piston rings.
3. Measure:
9
Piston pin hole inside diameter
a
Out of specifications
→
Replace.
ENG
Piston skirt diameter:
Standard:
40.95 ~ 40.97 mm
(1.612 ~ 1.613 in)
Piston pin hole inside diameter:
Standard:
10.000 ~ 10.020 mm
(0.3937 ~ 0.3945 in)
Limit:
10.050 mm
(0.3956 in)
Piston clearance:
0.01 ~ 0.04 mm
(0.0004 ~ 0.0016 in)
Piston clearance =
Cylinder inside diameter -
Piston skirt diameter
7VV10-03 02.10.8 8:05 PM Page 23