5-10
CYLINDER HEADS
ENG
NOTE:
NOTE:
EAS00228
CHECKING THE CYLINDER HEADS
The following procedure applies to all of the cyl-
inder heads.
1. Eliminate:
combustion chamber carbon deposits
(with a rounded scraper)
Do not use a sharp instrument to avoid damag-
ing or scratching:
spark plug threads
valve seats
2. Check:
cylinder head
Damage/scratches Replace.
3. Measure:
cylinder head warpage
Out of specification Resurface the cylin-
der head.
Cylinder head warpage
Less than 0.03 mm
a. Place a straightedge
1
and a thickness
gauge
2
across the cylinder head.
b. Measure the warpage.
c. If the limited is exceeded, resurface the cylin-
der head as follows.
d. Place 400 – 600 grit wet sandpaper on the
surface plate and resurface the cylinder
head using a figure-eight sanding pattern.
To ensure an even surface, rotate the cylinder
head several times.
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