Chery A11 2003 - Page 220

CAC Gasoline Engine Maintenance And Servicing Manual
76
16. Engine noise.
(1). Preigniton or knocking occursduring accelerating or under heavy load
Cause Correction
a. Incorrect ignition timing check ‘teeth’ belt tension, tension
pulley or distributor
b. Incorrect fuel grade use fuel of correct
grade
c. Intake manifold or connecting hose vacuum leakage check and service
d. Too much carbon deposits in Spark plug or combustion
chamber carbon severely clean carbon deposits
(2). whistle noise:
Cause Correction
a. Intake manifold sealing gasket leaks replace sealing gasket or tighten
bolts
b. Exhaust manifold sealing gasket leaks or replace sealing gasket or tighten
bolts
exhaust pipe sealing gasket leaks
c. Vacuum hose leaks replace
d. Cylinder head gasket burned badly check and replace
(3). Knocking or spanking noise
Cause Correction
a. Hydraulic valve lifter works abnormally check and replace
b. Valve mechanism or camshaft worn out check and service
c. Timing belt or tension pulley worn out replace
d. Abnormal accessories ie. alternator or water pump check, service and replace
(4). Knocking or hammering noise.
Cause
Correction
a. Connecting rod bushing worn out(generally severe knocking, check and service
May be relieved under load.)
b. Main bearing half shell worn out(booming or check and service
knocking noise, may be relieved under load.)
c. Piston knocking (apparent with engine cold) check and service
d. Alternator or water pump accessories damaged check and service
17. Engine is overheated.
Cause Correction
(1). No sufficient coolant in the cooling system add coolant
(2). thermostat damaged replace
(3). Radiator core blocked or air inlet cogged clean or replace radiator
(4). Radiator electrical fan or coolant temperature check, service and replace
sensor abnormal
(5). Expansion tank pressure cap damaged replace
(6). Water pump leaks or damaged service or replace
(7). ignition timing too late adjust ignition timing
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