6. CYLINDER HEAD/VALVES K-PIPE 50 Remove carbon deposits from the combustion chamber. Clean any gasket material from the cylinder head mating surface. Be careful not to damage the cylinder head mating surface and valve seat. CYLINDER HEAD INSPECTION Check the spark plug hole and valve areas for cracks. Check the cylinder head for warpage with a straight edge and feeler gauge. Service Limit: 0.05mm repair or replace if over CAMSHAFT INSPECTION Check each camshaft bearing for play or damage. Replace the camshaft assembly with a new one if the bearings are noisy or have excessive play. Camshaft Bearing Check each cam lobe for wear or damage. Measure the cam lobe height. Service Limits: IN: 25.8mm replace if below EX:25.6mm replace if below 6-6