Chery QQ Service Manual 465 Engine Mechanical System
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Chery Automobile Co., Ltd
tappet will make noise. Make the oil being put in
correct oil level.
Oil level is too low.
If oil level is lower than ADD(add mark),the
atmosphere will be pumped in by oil pump, it will
result in tappet noise, add oil if necessary.
l Oil pump filter screen is bent or too loosened.
Noise which has nothing to do
with engine speed.
Check the following circumstances:
l Lubricating system of rocker.
l Rocker ball wear.
l Rocker is bent or damaged.
l Valve rocker is too loosened or damaged.
3 Abnormal noise diagnosis of engine
Symptom Cause of malfunction/Troubleshooting
There is some knocking
sound while starting ,but
only continue several
seconds.
Oil viscosity is not suitable.
Use suitable oil viscosity according to estimated
temperature, see the maintenance and lubrication for
reference.
knocking continue 2-3
minutes while engine is cold
Engine cold start pinking sound usually disappears when
the specified cylinder secondary ignition circuits connect
the ground. Check the engine to see if it is under the
following circumstances:
l Crankshaft balancer or drive pulley is loose or
broken.
l Tighten or replace parts if necessary
l Clearance of piston and cylinder liner is too big.
Check the parts of piston, replace if necessary
l Connecting rod is bent
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