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1.Temporarily install the engine oil pan which was removed at the valve timing chain
removal (Refer to  ).
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2.
| caution |
When supporting the engine and transmission assembly with
a garage jack, be careful not to deform the engine oil pan.
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Place a garage jack against the engine oil pan with a piece of wood in between to support
the engine and transmission assembly.
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3.Remove special tool engine hanger (MB991928 or MB991895) which was installed for supporting
the engine and transmission assembly when the valve timing chain was removed.
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4.
| caution |
Be careful not to drop the camshaft bearing.
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Loosen the camshaft bearing front cap mounting bolts in the order of number shown in the
figure, and remove the camshaft bearing front cap assembly.
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Loosen the camshaft bearing cap mounting bolts in the order of number shown in the figure
in four or five steps, and remove the camshaft bearing caps.
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Remove all of the valve tappets by hands.
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1.Screw in special tool retainer holder attachment (MB992090) to special tool valve spring
compressor (MD998772), and assemble special tool retainer holder C (MB992089).
2.
| caution |
When removing the valve spring retainer lock, leave the piston
of the cylinder in the TDC (Top Dead Centre) position. The valve may fall into the cylinder
if the piston is not properly in the TDC position.
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Install special tool MD998772 (with special tools MB992090 and MB992089 attached) to the
cylinder head and compress the valve spring. Then, remove the valve spring retainer lock.
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Use special tool valve stem seal pliers (MB992085) to nip the base of the stem seal (where
the outside diameter is larger) securely, and remove it by twisting it to the left and right.
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1.Apply a small amount of engine oil to the valve stem seals.
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2.
| caution |
- Valve stem seals cannot
be reused.
- Do not damage the wall of the tappet hole when installing the valve stem seal.
- Special tool valve stem seal installer (MD998737) must be used to install the valve
stem seal. Improper installation of the valve stem seal could result in oil leaking past the
valve guide.
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Use special tool valve stem seal installer (MD998737) to press-fit a new valve stem seal
in the valve guide using the valve stem area as a guide.
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In the same manner as removal, use special tool valve spring compressor (MD998772) with
special tool retainer holder attachment (MB992090) and special tool retainer holder C (MB992089)
attached to compress the valve spring, and install the valve spring retainer lock.
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1.Apply a small amount of engine oil to the valve tappets.
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2.
| caution |
- Do not use pliers or
other tools to install the valve tappets. Always install them by hand.
- Be sure to install the valve tappets in the same position as before.
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Install the valve tappet to the cylinder head by hand.
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1.Install the camshaft bearing caps to the cylinder head.
| note |
Because the camshaft bearing thrust cap and camshaft bearing cap are the same in shape,
check the cap number and additionally its symbol to identify the inlet and exhaust sides for
correct installation.
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2.Tighten each camshaft bearing cap mounting bolts to the specified torque in the order
of number shown in the figure in two or three steps.
Tightening torque: 12 ± 1 N·m
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When replacing the camshaft bearing, select a camshaft bearing in relevant size according
to the camshaft bearing front cap identification mark in the table below. Identification mark
of the camshaft bearing is painted in the position shown in the figure.
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Camshaft
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Camshaft bearing identification mark
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Identification mark
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Journal diameter mm
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1
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40.000 - 40.008
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1
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2
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40.008 - 40.016
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2
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3
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40.016 - 40.024
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3
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1.
| caution |
When the mounting bolts are tightened with the camshaft bearing front
cap tilted, the camshaft bearing front cap is damaged. Install the camshaft bearing front cap
properly to the cylinder head and camshaft.
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Install the camshaft bearing front cap to the cylinder head, and temporarily tighten the
camshaft bearing front cap mounting bolts to the specified torque in the order shown in the
figure (1).
Tightening torque: 17 ± 3 N·m
2.Tighten again the camshaft bearing front cap mounting bolts to the specified torque
again in the order shown in the figure (2).
Tightening torque: 30 ± 2 N·m
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3.Install special tool engine hanger (MB991928 or MB991895) which was installed for supporting
the engine and transmission assembly when the valve timing chain was removed (Refer to ).
4.Remove the garage jack which supports the engine and transmission assembly.
5.Remove the engine oil pan installed temporarily.
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