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3. Measure:
• Cylinder head warpage
Out of specification → Resurface the cylinder
head.
Warpage limit
0.03 mm (0.0012 in)
M
MMM
M MMM
M
M MMM
M
M MMM
M
a. Place a straightedge "1" and a thickness
gauge "2" across the cylinder head.
1
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.
L
LLL
L LLL
L
L LLL
L
L LLL
L
EAS28P1026
CHECKING THE CAMSHAFT SPROCKET
1. Check:
• Camshaft sprocket
More than 1/4 tooth wear "a" → Replace the
camshaft sprocket and the timing chain as a
set.
M MMM
M
M MMM
M
MMM
2
L LLL
L
L LLL
L
LLL
5-13
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.
1. Check:
• Tappet cover
• Camshaft sprocket cover
Damage/wear → Replace.
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.
3. Check:
• Timing chain tensioner cap bolt
• Spring
• One-way cam
• Timing chain tensioner rod
Damage/wear → Replace the defective
part(s).
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Troubleshooting
