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To prevent damage to the cylinder head, camshafts or camshaft caps, loosen the camshaft cap bolts in stages and in a criss-cross pattern, working from the outside in.
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П Remove:
intake camshaft 1
exhaust camshaft 2
NOTE:
To prevent the timing chain from falling into the crankcase, faster it with a wire 3.
И Remove:
timing chain guide (exhaust side)
EAS00204
CHECKING THE CAMSHAFTS
Й Check:
camshaft lobes
Blue discoloration/pitting/scratches → Replace the camshaft.
5 - 10
CAMSHAFTS ENG
Л Measure:
camshaft lobe dimensions a and b
Out of specification → Replace the cam-shaft.
Camshaft lobe dimension Intake
a 33.252 ~ 33.352 mm (1.3091 ~ 1.3131 in) <Limit>:
33.152 mm (1.3052 in) b 24.956 ~ 25.056 mm
(0.9825 ~ 0.9865 in) <Limit>:
Mm (0.9786 in) Exhaust
a 33.252 ~ 33.352 mm (1.3091 ~ 1.3131 in) <Limit>:
33.152 mm (1.3052 in) b 24.956 ~ 25.056 mm
(0.9825 ~ 0.9865 in) <Limit>:
Mm (0.9786 in)
М Measure:
camshaft runout
Out of specification → Replace.
Camshaft runout limit
Mm (0.0012 in)
О Measure:
camshaft-journal-to-camshaft-cap clear-
ance
Out of specification → Measure the cam-shaft journal diameter.
Camshaft-journal-to-camshaft-cap clearance
0.020 ~ 0.054 mm
(0.0008 ~ 0.0021 in) <Limit>: 0.08 mm (0.0031 in)
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Р Install the camshaft into the cylinder head (without the dowel pins and camshaft caps).
Р Position a strip of Plastigauge® 1 onto the camshaft journal as shown.
5 - 11
CAMSHAFTS ENG
c. Install the dowel pins and camshaft caps.
NOTE:
СTighten the camshaft cap bolts in stages and in a crisscross pattern, working from the inner caps out.
СDo not turn the camshaft when measuring the camshaft-journal-to-camshaft cap clear-ance with the Plastigauge®.
T.
R.
Camshaft cap bolt
10 Nm (1.0 m · kg, 7.2 ft · lb)
d. Remove the camshaft caps and then mea-sure the width of the Plastigauge® 1.
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Т Measure:
camshaft journal diameter a
Out of specification → Replace the cam-shaft.
Within specification → Replace the cylinder head and the camshaft caps as a set.
Camshaft journal diameter 22.967 ~ 22.980 mm (0.9042 ~ 0.9047 in)
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CHECKING THE CAMSHAFT SPROCKETS,
AND TIMING CHAIN GUIDES
The following procedure applies to all of the camshaft sprockets and timing chain guides.
У Check:
camshaft sprocket
More than 1/4 tooth wear a → Replace the camshaft sprockets and the timing chain as
a set.
a 1/4 tooth b Correct
1 Timing chain roller
2 Camshaft sprocket
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CAMSHAFTS ENG
1 
2 
Ф Check:
timing chain guide (intake side) 1
timing chain guide (exhaust side) 2
timing chain guide (top side) 3 Damage/wear → Replace the defective part(-s).
CHECKING THE TIMING CHAIN
TENSIONER
Х Check:
timing chain tensioner Cracks/damage/rough movement → Replace.
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Ц Lightly press the timing chain tensioner rod into the timing chain tensioner housing by hand.
NOTE:
While pressing the timing chain tensioner rod, wind it clockwise with a thin screwdriver 1 until it stops.
Ч Remove the screwdriver and slowly release the timing chain tensioner rod.
Ч Make sure that the timing chain tensioner rod comes out of the timing chain tensioner housing smoothly. If there is rough move-
ment, replace the timing chain tensioner.
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INSTALLING THE CAMSHAFTS
Ш Install:
intake camshaft 1
exhaust camshaft 2
5 - 13
CAMSHAFTS ENG
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Ъ Turn the crankshaft counterclockwise.
Ъ When piston #1 is at TDC on the compres-sion stroke, align the “I” mark a on the A.C. magneto rotor with the stationary pointer b on the A.C. magneto cover.
Ъ Install the timing chain onto both camshaft sprockets, and then install the camshafts onto the cylinder head.
NOTE:
The camshafts should be installed onto the cylinder head so that the alignment mark c on the intake camshaft sprocket and the align-ment mark d on the exhaust camshaft sprocket align with the cylinder head mating surface, as shown in the illustration.
CAUTION:
Do not turn the crankshaft when installing the camshafts to avoid damage or improper valve timing.
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Ы Install:
dowel pins
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intake camshaft cap 1
exhaust camshaft cap 2
camshaft cap bolts
| T.R. | 10 Nm (1.0 m · kg, 7.2 ft · lb) |
CAUTION:
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