Do not use a sharp instrument to avoid damaging or scratching:

• spark plug bore threads

• cylinder head Damage/scratches ^ Replace.

• cylinder head water jacket Mineral deposits/rust ^ Eliminate.

3. Measure:

• cylinder head warpage

Out of specification ^ Resurface the cylinder head.

Maximum cylinder head warpage 0.05 mm (0.002 in)

a. Place a straightedge ® and a thickness gauge (2 across the cylinder head.

b. Measure the warpage.

c. If the limit is exceeded, resurface the cylinder head as follows.

d. Place a 400 - 600 grit wet sandpaper on the surface plate and resurface the cylinder head using a figure-eight sanding pattern.

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