Chery QQ Service Manual 465 Engine Mechanical System
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Chery Automobile Co., Ltd
Knocking noise while idling
heat start
Check the engine to see if it is under the following
circumstances:
l Driving belt wear
l Check tension , replace driving belt if necessary.
l The compressor of air condition system
l Replace parts if necessary .
l Oil viscosity is not suitable.
l Use oil with suitable viscosity according to estimated
temperature, see maintenance and lubrication for
reference.
l Piston pin clearance is too big.
l Replace piston and piston pin if necessary.
l Calibrate location of connecting rod
l Check connecting rod, replace if necessary.
l Clearance of piston and cylinder liner is not enough.
l Bore cylinder , install new piston
l Adjust looseness or torque of crankshaft balancer.
l Replace wearing parts
l Make sure that the direction of piston pin is right.
l Install piston correctly.
Slight pinking sound while
heat start.
Check to see if the engine is under the following
conditions:
l Detonation or ignition knock
l See engine control system for reference.
l Exhaust manifold leak gas.
l Fasten bolt or replace gasket
l Clearance of connecting rod bearing is too big.
l Replace connecting rod bearing if necessary
Severe knocking sound Check to see if the engine is under the following
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