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CYLINDER HEAD
INSPECTION
1. Eliminate:
S Carbon deposits
(from the combustion chambers)
Use the rounded scraper.
NOTE:
Do not use a sharp instrument to avoid damag-
ing or scratching:
S Spark plug threads
S Valve seats
2. Inspect:
S Cylinder head
Damage/scratches ! Replace.
S Cylinder head water jacket
Mineral deposits/rust ! Eliminate.
3. Measure:
S Cylinder head warpage
Out of specification ! Resurface the cylin-
der head.
Warpage limit:
0.1 mm (0.004 in)
Measurement steps:
S Place a straightedge 1 and a thickness
gauge 2 across the cylinder head.
S Measure the warpage.
S If the limited is exceeded, resurface the cylin-
der head as follows.
S Place a 400 X 600 grit wet sandpaper on the
surface plate and resurface the cylinder
head using a figure-eight sanding pattern.
NOTE:
To ensure an even surface, rotate the cylinder
head several times.
5-19
ENG
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Troubleshooting
