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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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1.Screw in special tool
retainer holder attachment (MB992090) to special tool valve
spring
compressor (MD998772), and assemble special tool retainer
holder D (MB992283). 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 MB992283 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.Mount the special tool
installer inlet ring (MH062687) to the crankshaft, and set
the
No. 1 cylinder top dead centre of its compression
stroke.
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2.Loosen the adjust screws
of the No. 1 and No. 3 exhaust rocker arm assemblies shown
in
the figure. 3.Remove the exhaust rocker arm
assembly. 4.Set cylinder No. 4 to the top dead
centre of compression stroke.
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5.Loosen the adjusting
screws of the No.2 and No.4 exhaust rocker arm assemblies
shown in
the figure. 6.Slide the spherical surface of the
adjusting screw from the pivot bolt, and remove
the exhaust rocker arm assembly.
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7.Remove the No. 4 exhaust
rocker arm assembly as follows. (1)
Turn the crankshaft clockwise from the No. 4 cylinder top
dead centre of its compression
stroke by 180°. With this status, the cam nose faces
upward. (2)
Loosen the adjusting screw of the exhaust rocker arm
assembly. (3)
Screw in special tool retainer holder attachment (MB992090)
to special tool valve spring
compressor (MD998772), and assemble special tool retainer
holder D (MB992283). (4)
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caution |
Note that the
valve may fall into the cylinder
when the retainer lock
comes off because the piston is not
in the TDC position.
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Install special tool MD998772 (with special tools
MB992090 and MB992283 attached) to the
cylinder head, and compress the valve spring while avoiding
the rocker arm. (5)
Remove the exhaust rocker arm assembly from the gap between
the cam and the cylinder inner
surface.
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1.
caution |
Valve stem seal for inlet
valves and for exhaust valves are different.
Be sure to install the correct
ones.
- Identification
colour.
Exhaust
valve stem seal: Green
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Apply an adequate and minimum amount of engine oil
to the valve stem seal.
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2.
caution |
- Valve stem seal cannot
be reused.
- Special tool valve stem seal installer
(MD998775) must be used to install the
valve
stem seal. Improper installation could
result in oil leaking past the valve
guide.
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Use special tool valve stem seal installer
(MD998775) to fill a new valve stem seal in
the valve guide using the valve stem area as a
guide. Driving amount of exhaust valve stem
seal: 19.8 mm
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Install the valve spring with its
identification colour painted end facing the locker
arm. Identification colour
Inlet:
Blue Exhaust: Nothing
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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 D (MB992283)
attached to compress the valve spring, and install the valve
spring retainer lock.
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In the same removal manner as No. 4
exhaust rocker arm assembly shown in the figure, using
the special tool valve spring compressor (MD998772) to which
the special tool retainer holder
attachment (MB992090) and special tool retainer holder D
(MB992283) are assembled, compress
the valve spring and install the exhaust rocker
arm.
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1.
caution |
Valve stem seal for inlet
valves and for exhaust valves are different.
Be sure to install the correct
ones.
- Identification
colour.
Inlet
valve stem seal: Grey
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Apply an adequate and minimum amount of engine oil
to the valve stem seal.
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2.
caution |
- Valve stem seal cannot
be reused.
- Special tool valve stem seal installer
(MB992284) must be used to install the
valve
stem seal. Improper installation could
result in oil leaking past the valve
guide.
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Use special tool valve stem seal installer
(MB992284) to fill a new valve stem seal in
the valve guide using the valve stem area as a
guide. Driving amount of inlet valve stem seal:
18.6 mm
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1.Install the rocker arm and
shaft assembly so that the Φ5.0 mm holes of rocker
arm shaft face the cylinder head side. 2.Check
that the identification marks on the rocker arm and shaft
assembly are on the
position shown in the figure. 3.Tighten the rocker
arm and shaft mounting bolts to the specified
torque. Tightening torque: 31 ± 3
N·m
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1.Completely remove the
sealant adhered to camshaft bearing rear cap and the
cylinder
head installation side of the camshaft bearing rear cap, and
degrease them with the volatile
degreasing agent.
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2.
caution |
- Remove the excessive sealant at the
supply pump assembly
mounting hole and the vacuum pump
assembly mounting hole using a rag or
the like.
- After the installation, until a
sufficient period of time (one hour or
more) elapses,
do not apply the engine oil or water to
the sealant application area or start
the engine.
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Apply the sealant with a diameter of 2 mm to the
camshaft bearing rear cap as shown in
the figure. Specified sealant: ThreeBond 1217G
or equivalent
note |
Install the camshaft bearing
rear cap immediately after applying
sealant.
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3.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 bearing cap number and additionally
its symbol to identify the inlet and exhaust
sides
for correct installation.
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4.Tighten each camshaft bearing cap mounting
bolt to the specified torque in the order
of number shown in the figure in two or three
steps.
Tightening
torque:
M6: 11 ± 1
N·m M8: 20 ± 1 N·m
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