Cylinder head and valve mechanisms
53
Check/repair of cylinder head
1. Make a defect test on the cylinder head. Replace the cylinder head when necessary.
2. Check the following items and repair or replace as necessary.
(1) Whether the valve seat is sunken.
(2) Whether the journal and end clearances of camshaft are too large.
3. Use a straight edge ruler and feeler as shown in Fig. to check in 6 directions whether the
cylinder head is distorted.
Max Distortion: 0.06mm (0.002in)
4. If the distortion of cylinder head surpassed the max.value, check the height of cylinder
head. If the height is also out of the standard value, replace the cylinder head.
Standard height: 124.45～124.55mm{4.8996～4.9035in}
5. If the distortion of cylinder head exceeded the max. value, but the height within the
standard value, you can grind the height or replace the cylinder head.
Max.grinding tolerance: 0.20mm (0.0078in)
6. Use a straight edge ruler and feeler as shown in Fig. to measure the distortions in all
directions of manifold flanges of cylinder head intake and exhaust.
Max. distortion: 0.05mm (0.0019in)
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