Chery T21 2014 Service Manual page 441

DIAGNOSIS & TESTING
Engine Performance Diagnosis
HINT:
 Use the table below to help determine the cause of the problem. Check each suspected area in sequence.
 Repair or replace the faulty components, or adjust as necessary.
Symptom
Valve mechanism noise
Connecting rod noise
Main bearing noise
Oil loss or spark plug blockage
Chery Automobile Co., Ltd.
Suspected Area
Engine oil (oil level high or low, oil lean or
rich)
Cam
Valve spring seat (excessive runout)
Valve (excessive clearance between valve
and guide)
Engine oil (low pressure)
Engine oil (lean)
Connecting rod bearing cap (loose fixing
nut)
Connecting rod (misaligned)
Connecting rod bearing shell (excessive
radial clearance)
Connecting rod journal (out-of roundness)
Engine oil (low pressure)
Engine oil (lean)
Main bearing shell (excessive clearance)
Crankshaft axial clearance (excessive)
Crankshaft journal (out-of roundness or
worn)
Flywheel or clutch (loose)
Piston ring (worn, scratched or damaged)
Piston ring groove (fouled)
Valve oil seal (worn or damaged)
Valve (excessive clearance between valve
and guide)
07 - SQR484F ENGINE MECHANICAL
See page
13-11
07-49
07-57
07-60
13-10
13-11
07-98
07-97
07-91
07-91
13-10
13-11
07-90
07-90
07-89
07-42
07-84
07-87
07-57
07-60
07
19
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