Piston-To-Cylinder Clearance; Piston Ring Inspection - Yamaha F100A Manual De Servicio

POWR
CRANKSHAFT AND PISTON/
CONNECTING ROD ASSY.

Piston-to-cylinder clearance

1. Calculate:
Piston-to-cylinder clearance
Out of specification → Replace the
piston and piston rings, the cylinder
block or both.
Piston-to-
cylinder =
clearance
Piston-to-cylinder clearance:
0.070 ~ 0.080 mm
(0.0028 ~ 0.0031 in)

Piston ring inspection

1. Measure:
End gap a
Out of specification → Replace the
piston rings as a set.
End gap (installed):
Top ring:
0.15 ~ 0.30 mm
(0.006 ~ 0.012 in)
2nd ring:
0.70 ~ 0.90 mm
(0.028 ~ 0.035 in)
Oil ring:
0.20 ~ 0.70 mm
(0.008 ~ 0.028 in)
NOTE:
Push the piston ring into the cylinder with
the piston crown.
5-38
Cylinder Piston
–
bore diameter
E