Piston And Piston Pin Inspection - Yamaha EF1000iS Service Manual

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.
Piston skirt diameter:
Standard:
40.95 ~ 40.97 mm
(1.612 ~ 1.613 in)
2. Measure:
9 Piston clearance
Out of specifications → Rebore or
replace cylinder and replace piston and
piston rings.
Piston clearance:
0.01 ~ 0.04 mm
(0.0004 ~ 0.0016 in)
Piston clearance =
Cylinder inside diameter -
Piston skirt diameter
3. Measure:
9 Piston pin hole inside diameter a
Out of specifications → Replace.
Piston pin hole inside diameter:
Standard:
10.000 ~ 10.020 mm
(0.3937 ~ 0.3945 in)
Limit:
10.050 mm
(0.3956 in)
3-23
ENG