CYLINDER HEADS
5-22
EAS24150
REMOVING THE CYLINDER HEADS
1. Remove:
• Cylinder head bolts
• Cylinder head nuts
TIP
• Loosen the cylinder head nuts in the proper
sequence as shown.
• Loosen each cylinder head nut 1/2 of a turn
at a time. After all of the cylinder head nut
are fully loosened, remove them.
EAS24170
CHECKING THE CYLINDER HEADS
The following procedure applies to all of the
cylinder heads.
1. Eliminate:
• Combustion chamber carbon deposits
(with a rounded scraper)
TIP
Do not use a sharp instrument to avoid damag-
ing or scratching:
• Spark plug bore threads
• Valve seats
2. Check:
• Cylinder heads
Damage/scratches → Replace.
3. Measure:
• Cylinder head warpage
Out of specification → Resurface the cyl-
inder head.
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a. Place a straightedge “1” and a thickness
gauge “2” across the cylinder head.
b. Measure the warpage.
c. If the limit is exceeded, resurface the cylin-
der head as follows.
d. Place 400–600 grit wet sandpaper on a
surface plate and resurface the cylinder
head using a figure-eight sanding pattern.
TIP
To ensure an even surface, rotate the cylinder
head several times.
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EAS24230
INSTALLING THE CYLINDER HEADS
1. Tighten:
• Cylinder head nuts
• Cylinder head bolts
A. Front cylinder head
B. Rear cylinder head
Warpage limit
0.05 mm (0.0020 in)
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