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.
• 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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