ENG
4-10
CHECKING THE CYLINDER HEAD
1. Eliminate:
• Combustion chamber carbon deposits
(with a rounded scraper)
N
TE:
Do not use a sharp instrument to avoid damag-
ing or scratching:
• Spark plug bore threads
• Valve seats
2. Check:
• Cylinder head
Damage/scratches → Replace.
3. Measure:
• Cylinder head warpage
Out of specification → Resurface the cylin-
der head.
a. Place a straightedge and a thickness
gauge across the cylinder head.
b. Measure the warpage.
c. If the limit is exceeded, resurface the cylin-
der 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.
N
TE:N
TE:
To ensure an even surface, rotate the cylinder
head several times.
Warpage limit
0.05 mm (0.0020 in)
CYLINDER HEAD
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