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1.Remove the rocker cover
(Refer to  ).
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2.
| caution |
The crankshaft should always
be turned in a clockwise direction.
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Align the camshaft sprocket timing marks and set the
No. 1 cylinder at top dead centre.
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3.By using the thickness
gauge, respectively measure the clearance between the cam at
the
portion marked with the arrow and the roller, as shown in
the illustration.
Standard value (cold
engine):
Inlet valve: 0.08 ± 0.03
mm
Exhaust valve: 0.16 ± 0.03
mm
4.If the valve clearance is
not as specified, loosen the rocker arm lock nut and adjust
the clearance using a thickness gauge between the cam and
the roller while turning the adjusting
screw.
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5.
| caution |
Pay special attention that the
tightening torque is not beyond
this valve. If the tightening torque is beyond
the valve, the valve stem would possibly
bend.
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While holding the adjusting screw with a screwdriver
to prevent it from turning, tighten
the lock nut to the specified torque using the special tool,
valve adjusting socket.
Special tool (valve
adjusting socket):
Inlet side:
MB991477
Exhaust side:
MB992046
Tightening
torque:
Inlet side: 9.0 ± 1.0
N·m
Exhaust side: 9.8 ± 1.0
N·m
6.Turn the crankshaft
360° clockwise to bring No. 4 cylinder to the top dead
centre position.
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7.Respectively measure the
clearance at the portion marked with the arrow, according to
step 3.
8.If the clearance is not within the
standard value, repeat steps 4 and 5
above.
9.Install the rocker cover (Refer to ).
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