6. CYLINDER HEAD/VALVES K-XCT 125i
SPECIAL TOOLS
Valve spring compressor A120E00040
TROUBLESHOOTING
The poor cylinder head operation can be diagnosed by a compression test or by tracing engine
Poor performance at idle speed White smoke from exhaust muffler
Compression too low Worn valve stem or valve guide
Damaged valve stem oil seal
Compression too low
Incorrect valve clearance adjustment Abnormal noise
Burned or bend valves Incorrect valve clearance adjustment
Incorrect valve timing Sticking valve or broken valve spring
Broken valve spring Damaged or worn camshaft
Poor valve and seat contact Worn cam chain tensioner
Leaking cylinder head gasket Worn camshaft and rocker arm
Warped or cracked cylinder head
Poorly installed spark plug
Compression too high
Excessive carbon build-up in combustion
chamber
6-3
4.7 / 5