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6
Cylinder and piston
The guide pin for the piston ring has been pushed up
through the top of piston.
Irregular grooves on the piston’s inlet side caused by
a broken roller retainer.
Deep, irregular grooves caused by a loose circlip.
Shown here on the piston’s inlet side.
Piston ring guide pin vibrated
loose
A too high engine speed can cause the
ends of the piston ring to hammer against
the guide pin when the piston ring moves
in its groove. The intensive hammering
can drive out the pin through the top of
the piston causing serious damage also
to the cylinder.
Damage caused by gudgeon pin
circlips
A too high engine speed can cause the
gudgeon pin circlips to vibrate. The
circlips are drawn out of their grooves due
to the vibrations, which in turn reduces
the circlips’ tensioning power. The rings
can then become loose and damage the
piston.
Bearing failure
Failure of the crankshaft bearing or on the
connecting rod bearing is usually caused
by a too high engine speed, resulting in
the bearing being overloaded or
overheating. This in turn can cause the
bearing rollers or ball to glide instead of
rotate, which can cause the roller or ball
retainer to break.
The broken debris can be trapped
between the piston and cylinder wall,
damaging the piston skirt.
Debris can also pass up through the
cylinder’s transfer channels and cause
damage to the top and sides of the piston
as well as to the cylinder’s combustion
chamber.
Small score marks and a matt, grey surface on the
piston’s inlet side caused by fine dust particles.
Foreign objects
Everything other than clean air and pure fuel that enters the engine’s inlet port
causes some type of abnormal wear or damage to the cylinder and piston.
This type of increased wear shows on the piston’s inlet side starting at the lower
edge of the piston skirt.
The damage is caused by badly filtered air that passes through the carburettor and
into the engine.
Содержание 326C, 326L, 326LX-Series, 326LDX-Series
Страница 1: ...Workshop manual 326R 326L 326C English ...
Страница 31: ...30 4 Centrifugal clutch ...
Страница 35: ...34 5 Angle gear ...
Страница 45: ...44 6 Cylinder and piston ...
Страница 51: ...50 7 Crankshaft and crankcase ...
Страница 55: ...2004W38 114 03 03 26 ...