Yamaha EF1000iS, Service Manual

Page: 57 / 109

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CRANKSHAFT, PISTON AND PISTON RING
1
2
3
1
2
3
RN
a
b
1
2
3
120°
120°
120°
Top ring
Second ring
Oil ring
a
1
2
PISTON AND PISTON RING INSTALLATION
1. Install:
9
Top ring
9
Second ring
9
Oil ring ring
NOTE:
9
Be sure to install the top ring and second
ring so that the “RN” mark a faces towerd
the piston head.
9
Make sure that the piston rings move
smoothly.
2. Apply 4-stroke engine oil to the inside of
the connecting rod small end.
3. Install:
9
Piston
1
9
Piston pin
2
9
Piston pin circlip
3
NOTE:
Make sure that the “YAMAHA” mark
a
on the
piston head and the “7VV” mark
b
on the con-
necting rod toward as same faces, then install.
CONNECTING ROD AND CRANKSHAFT
INSTALLATION
1. Make sure that the end gap of each piston
ring is positioned, as shown in the illustra-
tion.
2. Install:
9
Piston
1
9
Connecting rod 2
c C
Make sure that the “7VV” mark
a
on the con-
necting rod faces toward the crankcase cover.
ENG
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