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6. CYLINDER HEAD/VALVES Downtown 300i ABS
VALVE STEM INSPECTION
Inspect each valve for bending, burning, or
abnormal stem wear.
Intake valve Exhaust valve
Valves
Remove carbon deposits from the
combustion chamber.
Clean off any gasket remnants from the
cylinder head contact surface.
Be careful not to damage the cylinder
head mating surface.
CYLINDER HEAD ASSEMBLY
Install the valve spring seats and stem seals.
Lubricate each valve stem with engine oil and
insert the valves into the valve guides.
Be sure to install new valve stem seals.
Install the valve spring.
Special
Valve spring compressor E040
· Tap the valve stems gently with a
plastic hammer for 23 times to firmly
seat the cotters.
· Be careful not to damage the valves.
Valve spring compressor
6-8