Yamaha EF3000iSE Service Manual page 80

PISTON, CONNECTING ROD, CRANKSHAFT AND
CRANKCASE
2. Measure:
• Piston clearance
Out of specification → Rebore or
replace cylinder and replace piston and
piston rings.
Piston clearance:
Wear limit:
Piston clearance =
Cylinder inside diameter –
Piston skirt diameter
3. Measure:
• Piston pin hole inside diameter
Out of specification → Replace.
Piston pin hole inside diameter:
Wear limit:
SVU3600J
4. Measure:
• Piston pin diameter
Out of specification → Replace.
Piston pin diameter:
Wear limit:
SVU3610J
5. Inspect:
• Check that the piston pin enters
smoothly into the piston pin hole.
If the piston pin fits tightly into the pis-
ton, check the piston pin hole. If there is
any protrusion, use a knife or scraper to
gently remove it so that the piston pin
can be pushed in gently with your fin-
gers.
SVU3620J
3-39
ENG
0.015 ~ 0.040 mm
(0.00059 ~ 0.00157 in)
0.15 mm (0.00591 in)
16.002 ~ 16.013 mm
(0.6300 ~ 0.6304 in)
16.043 mm (0.6316 in)
15.995 ~ 16.000 mm
(0.6297 ~ 0.6299 in)
16.043 mm (0.6316 in)