Yamaha EF2800i - Inverter Generator, Service Manual

Page: 60 / 103

3-32
ENG
PISTON, CONNECTING ROD, CRANKSHAFT AND
CRANKCASE
CRANKCASE (CYLINDER) INSPECTION
1. Measure:
• Cylinder inside diameter
NOTE:
Take side to side
a
and front to back
b
mea-
surements at each of the three locations A, B,
C (total of six measurements), and then find
the average of the measurements.
Maximum wear = Maximum A, B, C.
Cylinder taper = Maximum A – Minimum C.
Out of specification
→
Replace.
Cylinder inside diameter:
66.00 ~ 66.02 mm
(2.5984 ~ 2.5990 in)
Cylinder inside diameter wear
limit:
66.020 mm (2.5990 in)
Cylinder taper limit:
0.05 mm (0.002 in)
SVU3590
2. Measure:
• Cylinder warpage
NOTE:
Measure the warpage on the contact surface
of the cylinder head at six points using a
straight edge and thickness gauge.
Out of specification
→
Resurface or
replace.
Warpage limit:
0.05 mm (0.002 in)
SVU3600
PISTON AND PISTON PIN INSPECTION
1. Measure:
• Piston skirt diameter
P
a
= 10 mm (0.4 in) from the piston bottom edge
Out of specification
→
Replace.
Piston skirt diameter:
66.0 mm (2.598 in)
Wear limit:
65.9 mm (2.594 in)
SVU3610