Piston And Piston Ring Installation - Yamaha EF2000iS Service Manual

PISTON, CONNECTING ROD, CRANKSHAFT AND
1
2
3
CRANKCASE
3. Remove:
9 Connecting rod cap
9 Connecting rod
Crack/damage/wear → Replace the
crankshaft.
4. Measure:
9 Widest portion of the pressed Plasti-
gauge
Out of specification → Replace crank-
shaft or connecting rod, and then mea-
sure the clearance again.

PISTON AND PISTON RING INSTALLATION

1. Install:
9 Top ring 1
9 Second ring 2
9 Oil ring 3
TIP
9 Be sure to install the top ring and second
ring so that the "SH" mark a faces toward
the piston head.
9 Make sure that the piston rings move
smoothly.
9 Color code of piston rings:
Top ring: blue paint (in case of a new part)
Second ring: red paint (in case of a new
part)
2. Apply 4-stroke engine oil to the inside of
the connecting rod small end.
SCF3730
3-41
ENG
Connecting rod big end oil clear-
ance:
0.008 – 0.038 mm
(0.0003 – 0.0015 in)
Wear limit:
0.1 mm (0.004 in)