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