Yamaha EF2000iS - Inverter Generator, Service Manual

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3-38
ENG
PISTON, CONNECTING ROD, CRANKSHAFT AND
CRANKCASE
a
a
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.
4. Measure:
9
Piston pin diameter
a
Out of specifications
→
Replace.
5. Inspect:
9
Check 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 piston pin can
be pushed in gently with your fingers.
Piston clearance:
0.015 – 0.040 mm
(0.0006 – 0.0016 in)
Limit: 0.100 mm (0.0039 in)
Piston clearance =
Cylinder inside diameter –
Piston skirt diameter
Piston pin hole inside diameter:
12.004 mm (0.4725 in)
Wear limit:
12.05 mm (0.4744 in)
Piston pin diameter:
11.996 – 12.000 mm
(0.4723 – 0.4724 in)
Wear limit:
11.95 mm (0.4705 in)
7DK40-03_b 6/12/09 5:50 PM Page 45