Cylinder Inspection; Piston And Piston Pin Inspection - Yamaha EF2000iS Manuel D'atelier

PISTON, CONNECTING ROD, CRANKSHAFT AND
a
b
P
a
CRANKCASE

CYLINDER INSPECTION

1. Measure:
9 Cylinder inside diameter
TIP
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.
Cylinder taper = Maximum A – Minimum C.
Out of specification → Replace the
crankcase.
Cylinder inside diameter:
48.600 – 48.620 mm
(1.9134 – 1.9142 in)
Cylinder inside diameter wear
limit:
48.620 mm (1.9142 in)
Cylinder taper limit:
0.05 mm (0.002 in)
2. Measure:
9 Cylinder warpage
TIP
Measure the warpage on the contact surface
of the cylinder head at six points using a
straight edge and thickness gauge.
Warpage limit:
0.05 mm (0.002 in)
Out of specification → Replace.

PISTON AND PISTON PIN INSPECTION

1. Measure:
9 Piston skirt diameter P
a = 10 mm (0.4 in) from the piston bot-
tom edge
Out of specification → Replace.
Piston skirt diameter:
48.574 – 48.594 mm
(1.9123 – 1.9131 in)
Wear limit:
48.53 mm (1.911 in)
3-37
ENG