1.5L REVOTORQ ENGINE 54 C. CYLINDER HEAD NOTE The mating surfaces of the cylinder head are not machinable. If the surface is warped, uneven, or damaged otherwise, replace the cylinder head. 1. Using a straight edge and feeler gauge, check evenness of cylinder head parting surface with crank case. If unevenness exceeds specified values, replace cylinder head. 2. Permissible unevenness of cylinder head mating surface 0.04 per 150mm sample length & maximum up to 0.1. D. VALVES 1. Check valve leakages by pouring fuel on valve head. Fuel must not seep past valve seat. 2. Valves with burnt heads, excessive scoring and wear on stem should be replaced. 3. Check valve seat run out with respect to valve stem. If it exceeds specified limit replace valve. No attempt should be made to straighten bent valves. 4. If valve is free from any other defects except worn out seat, then only it can be rematched on valve grinding machine as follows: Clamp valve on grinding machine jaws as close as possible to valve head. Adjust grinding angle on graduated scale to achieve correct valve seat angle. Feed valve slowly towards grinding wheel until wheel just touches valve head. Grind at low feed until valve seat is just clean all around. NOTE After machining the valve seat, remove the valve from the grinding machine and check valve head thickness. The minimum valve head thickness of the valve is 0.85 mm.
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