Operation Manual of WEICHAI GENSET
causing rhythmic slight tapping
sound
If the diesel engine load is increased
when the engine is not warmed up,
3
knocking sound will be generated
because the clearance between the
piston and the cylinder liner is
relatively large
Excessive wear of piston, piston ring
4
and cylinder liner causing knocking
sound
Knocking sound across engine
5
because of heavy wear of journal
and bearing bush of crankshaft.
6
Excessive compression ratio, rough
running and intensive vibration
The clearance between the intake
and exhaust valves is too small or
7
the intake and exhaust timing is
incorrect, causing the valves hitting
the top of the piston
8
Individual cylinders are not working
resulting heavy vibrations in engine
Valve breakage (or sudden and
9
violent impact sound made due to
the damage of the valve collet, the
valve falling or the piston breaking)
10
Air leakage howling at the cylinder
head gasket
11
Knocking sound due to excessive
wear of gears
The engine vibrations are
12
intensified because of fixing bolts of
engine are loose or damaged.
The diesel engine and the alternator
13
are eccentric, so the vibration is
intensified
11. Unstable operation of engine
Unload and idle to warm up
Replace corresponding parts
Check or replace the bearing
Adjust the compression ratio
Adjust the valve clearance or valve
timing
Check the fuel system and eliminate
the fault
Stop immediately for inspection
Check the tightness of the cylinder
head nut, and replace the cylinder
head gasket if necessary
Check and replace it.
Tighten or replace the bolts
Check and adjust.
S/N Fault
1
Fault of electronic governor
Treatment method
Adjust the differential and gain of
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