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After removing the cowl top panel, attach a protection tape for the windshield on the
lower area of the windshield.
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Loosen the cylinder head cover assembly mounting bolts in the order of the numbers shown
in the illustration.
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1.
| caution |
Never turn the crankshaft anti-clockwise.
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Turn the crankshaft clockwise, and align the timing mark of the inlet camshaft sprocket
and that of the exhaust camshaft sprocket (2 concave areas in front of the camshaft sprocket).
Then set No.1 cylinder to the TDC.
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2.While holding the inlet camshaft hexagonal area with a wrench or a similar tool, slightly
turn the exhaust camshaft clockwise to tighten the timing chain at the timing chain tensioner
side and shorten the plunger of the timing chain tensioner.
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3.With the plunger of the tensioner shortened, insert a pin or a similar tool (3 mm or less
in diameter) to the hole shown in the illustration of the timing chain tensioner.
4.
| caution |
Do not turn the crankshaft after removing the timing
chain tensioner.
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Loosen the timing chain tensioner mounting bolts, and remove the timing chain tensioner
from the timing chain case hole.
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1.Fix the camshaft sprocket and the timing chain using a cable band or a similar tool.
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2.While holding the exhaust camshaft hexagonal area using a wrench or a similar tool, loosen
the exhaust camshaft sprocket mounting bolt.
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3.While holding the inlet camshaft hexagonal area using a wrench or a similar tool, use
special tool torque wrench adapter (MB991992) to loosen the inlet camshaft sprocket mounting
bolt.
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4.Loosen the front camshaft bearing cap mounting bolts in the order shown, and then loosen
each camshaft bearing cap mounting bolts as well. Remove the front camshaft bearing cap and
each camshaft bearing cap.
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5.
| caution |
Do not turn the crankshaft after removing the camshaft sprocket
assembly with the timing chain.
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Slightly raise the exhaust camshaft with the camshaft sprocket and timing chain assembly
from the cylinder head, remove the camshaft sprocket mounting bolt, and disconnect the camshaft
sprocket and timing chain assembly from the exhaust camshaft.
6.In the same way as Step 5, disconnect the inlet camshaft sprocket and timing chain
assembly from the inlet camshaft.
7.
| caution |
After disconnecting the camshaft sprocket (with the timing chain)
from the camshaft, do not dislocate the camshaft sprocket, the V.V.T. sprocket assembly and
the timing chain.
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After removal, place the camshaft sprocket and timing chain assembly on the timing chain
case assembly.
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1.First, lift the inlet camshaft sprocket side of the camshaft sprocket and the timing chain
assembly. Then align the dowel pin of the inlet camshaft with the inlet camshaft sprocket groove,
and assemble the inlet camshaft and the inlet camshaft sprocket. Temporarily tighten the mounting bolt.
2.Next, lift the exhaust camshaft sprocket side of the camshaft sprocket and the timing
chain assembly. Then align the dowel pin of the exhaust camshaft with the exhaust camshaft sprocket
groove, and assemble the exhaust camshaft and the exhaust camshaft sprocket. Temporarily tighten
the mounting bolt.
3.Place the inlet camshaft and exhaust camshaft on the installing location of the cylinder
head.
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4.The No.2 to No.4 bearing caps are equally shaped for both the inlet and exhaust camshafts.
Be sure to correctly install them by referring to the identification marks.
Identification mark (stamped on the front and No.2
to No.4 bearing caps)
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5.Tighten each camshaft bearing cap mounting bolts to the specified torque in the order
shown, and then tighten the front camshaft bearing cap mounting bolts as well.
Tightening torque:
11 ± 1 N·m (Camshaft bearing cap
mounting bolts)
20 ± 1 N·m (Front camshaft bearing cap mounting bolts)
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6.While holding the inlet camshaft hexagonal area using a wrench or a similar tool, use
special tool torque wrench adapter (MB991992) to tighten the inlet camshaft sprocket mounting
bolt to the specified torque. Since the inlet camshaft sprocket mounting bolt is tightened by
special tool (MB991992), calculate the tightening torque by the following formula.
Tightening torque: (65 ± 5) × {L ÷ (L + 150)} N·m
65 ± 5: Tightening torque of the inlet camshaft sprocket
mounting bolt (unit: N·m)
L: Distance between the centre of a torque wrench drive and of its handle (unit:
mm)
150: Length of special tool (unit: mm)
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7.While holding the exhaust camshaft hexagonal area using a wrench or similar tool, tighten
the camshaft sprocket mounting bolt to the specified torque.
Tightening torque: 92 ± 13 N·m
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1.Install the timing chain tensioner with the pin or the similar tool to the cylinder block
through the timing chain case hole, and tighten the timing chain tensioner mounting bolts to
the specified torque.
Tightening torque: 9.5 ± 2.5 N·m
2.Pull out the pin or the similar tool of the timing chain tensioner.
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1.Remove the sealant from the installation face of the timing chain tensioner cover
and the timing chain case assembly.
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2.Apply a bead of the specified sealant to the mating surface of the timing chain case assembly.
Specified sealant: ThreeBond 1217G or equivalent
| note |
Install the timing chain case cover immediately after applying sealant.
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1.Remove the sealant from the cylinder head cover assembly and the matching area of
the cylinder head assembly and the timing chain case assembly.
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2.
| caution |
After the installation, until a sufficient period of time (one hour or
more) elapses, do not apply the oil or water to the sealant application area or start the engine.
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Apply sealant to the joint between the cylinder head and timing chain case assembly as
shown in the figure and install the cylinder head cover assembly to the cylinder head.
Specified sealant: ThreeBond 1217G or equivalent
| note |
Install the cylinder head cover assembly immediately after the application of sealant.
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3.Tighten the cylinder head cover assembly mounting bolts to the specified torque in the
order of the numbers shown in the illustration.
Tightening torque: 3.0 ± 1.0 N·m
4.Tighten again the cylinder head cover assembly mounting bolts to the specified torque
in the order of number shown in the figure.
Tightening torque: 5.5 ± 0.5 N·m
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