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3. Measure:
• Cylinder head warpage
Out of specification → Resurface the cylinder
head.
Warpage limit
0.03 mm (0.0012 in)
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a. Place a straightedge "1" and a thickness
gauge "2" across the cylinder head.
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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.
TIP
To ensure an even surface, rotate the cylinder
head several times.
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EAS1S3L024
CHECKING THE CAMSHAFT SPROCKET
1. Check:
• Camshaft sprocket
More than 1/4 tooth wear "a" → Replace the
camshaft sprockets and the timing chain as a
set.
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5-11
CYLINDER HEAD
a. 1/4 tooth
b. Correct
1. Timing chain roller
2. Camshaft sprocket
EAS23940
CHECKING THE TAPPET COVERS AND
CAMSHAFT SPROCKET COVER
The following procedure applies to both of the
tappet covers and O-rings.
1. Check:
• Tappet covers "1"
• Camshaft sprocket cover "2"
• O-ring
Damage/wear → Replace the defective
part(s).
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EAS23960
CHECKING THE TIMING CHAIN TENSIONER
1. Check:
• Timing chain tensioner
Cracks/damage → Replace.
2. Check:
• One-way cam operation
Rough movement → Replace the timing
chain tensioner housing.
3. Check:
• Cap bolt
• Copper washer
• Spring
• One-way cam
• Timing chain tensioner gasket
• Timing chain tensioner rod
Damage/wear → Replace the defective
part(s).
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