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For the troubleshooting of crankshaft connecting rod mechanism, please
refer to the following table.
Maintenance of Crankshaft Connecting Rod Mechanism
Description
Damage from
Trouble
Cause
Correction
Piston
Carbon deposit on piston
top
活塞顶部积碳
The engine over- heats
Remove the carbon
deposit
Carbon deposit in the ring
groove
环槽中积碳
The piston ring is seized in ring
groove
活塞环卡在环形槽中
The engine starts hard or fails to
start. Insufficient engine output;
Thick blue and white fume form
the exhaust muffler pipe
Scuffing or scratches on
the surface of piston skirt
Scuffing or scratches on the surface
of piston skirt
The
piston and ring
groove are over worn
Excessive fitting clearance between
the piston and the cylinder
The engine starts hard or fails to
start. Insufficient engine output;
Thick blue and white fume form
the exhaust muffler pipe
Replace the piston
The piston pin hole is over
worn
Excessive fitting clearance between
the piston ring and the hole.
Striking sound of the piston pin
and of the cylinder
Crank pin
The crank pin is over worn
Radial and axes gap of the
connecting rod big end is too large
Striking sound of the big-end
bearing; Striking sound of the
cylinder
Replace the
crankshaft
connecting rod
Bearing
The big-end needle
bearing is over worn
Radial and axes gap of the
connecting rod big end is too large
Striking sound of the big-end
bearing; and of the cylinder
Replace the
crankshaft
connecting rod
更换曲轴连杆
