Engine Components Inspection And Servicing; Bearings; Oil Seals; Crankshaft - HYOSUNG WOW90 Service Manual

ENGINE COMPONENTS INSPEC-
TION AND SERVICING

BEARINGS

Wash the bearing with cleaning solvent and lubricate
with motor oil before inspecting.
Turn the inner ring and check to see that the inner ring
turns smoothly. If it does not turn lightly, quietly and
smoothly, or if noise is heard, the bearing is defective
and must be replaced with a new one.

OIL SEALS

Damage to the lip of the oil seal may result in leakage of
the fuel-air mixture or oil. Inspect for damage and be
sure to replace the damaged seal if found.

CRANKSHAFT

◉ CRANKSHAFT RUNOUT
Support the crankshaft by the V-blocks, with the dial
gauge rigged to read the runout as shown.
Crankshaft runout
V-block : 09943-21304
Magnetic stand : 09900-20701
Dial gauge : 09900-20606
Excessive the crankshaft runout is often responsible for
abnormal engine vibration. Such vibration shortens
engine life.
◉ WEAR AND CLEARANCE OF CONROD BIG END
Turn the crankshaft with the conrod to feel the smooth-
ness of rotary motion in the big end. Move the rod up
and down while holding the crankshaft rigidly to be sure
that there is no rattle in the big end.
Wear on the big end of the conrod can be estimated by
checking the movement of the small end of the rod. This
method can also check the extent of wear on the parts
of the conrod s big end.
If wear exceeds the limit, conrod, crank pin and crank
pin bearing should all be replaced.
Conrod big end runout
Service limit
0.05 mm (0.002 in)
Service limit
3.0 mm (0.12 in)
ENGINE 3-16