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1.Check the camshaft bearing
journals for damage and binding. If the journals are
binding,
check the cylinder head for damage. Also check the cylinder
head for clogged oil holes.
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2.Check the cam surface for
abnormal wear and damage and replace if necessary. Also
measure
the cam height and replace if out of minimum
limit. Standard value: Intake 37.584
mm Exhaust 36.953
mm Limit: Intake 37.080
mm Exhaust 36.450 mm
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caution |
- The lash adjusters are
precision-engineered
mechanisms. Do not allow them to become
contaminated by dirt or other foreign
substances.
- Do not attempt to disassemble the lash
adjusters.
- Use only fresh diesel fuel to clean the
lash adjusters.
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1.Prepare three containers and approximately
5 dm3 of diesel fuel. Into each
container, pour enough diesel fuel to completely cover a
lash adjuster when it is standing upright.
Then, perform the following steps with each lash
adjuster.
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2.Place the lash adjuster in
container A and clean its outside surface.
note |
Use a nylon brush if deposits
are hard to remove.
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3.
caution |
The steel ball spring is
extremely weak, so the lash adjuster’s
functionality may be lost if the air bleed wire
is pushed in hard.
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While gently pushing down the internal steel ball
using wire (0.5 mm in diameter) or special
tool Air bleed wire (MD998442), move the plunger through
five to ten strokes until it slides
smoothly. In addition to eliminating stiffness in the
plunger, this operation will remove dirty
oil.
note |
If the plunger remains stiff
or the mechanism appears otherwise abnormal,
replace the lash
adjuster.
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4.Remove the lash adjuster
from the container. Then, push down the steel ball gently
and
push the plunger to eliminate diesel fuel from the pressure
chamber.
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5.
caution |
The steel ball spring is
extremely weak, so the lash adjuster’s
functionality may be lost if the air bleed wire
is pushed in hard.
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Place the lash adjuster in container B. Then, gently
push down the internal steel ball
using a wire (0.5 mm in diameter) or special tool Air bleed
wire (MD998442) and move the plunger
through five to ten strokes until it slides smoothly. This
operation will clean the lash adjuster’s pressure
chamber.
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6.Remove the lash adjuster
from the container. Then, push down the steel ball gently
and
push the plunger to eliminate diesel fuel from the pressure
chamber.
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7.
caution |
Do not use container C for
cleaning. If cleaning is performed
in container C, foreign matter could enter the
pressure chamber when the chamber is filled with
diesel fuel.
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Place the lash adjuster in container C. Then, gently
push down the internal steel ball
using a wire (0.5 in diameter) or special tool Air bleed
wire (MD998442).
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8.Stand the lash adjuster
with its plunger at the top, then push the plunger downward
firmly
until it moves through its greatest possible stroke. Return
the plunger slowly, then release
the steel ball and allow the pressure chamber to fill with
diesel fuel.
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9.Remove the lash adjuster
from the container, then stand the lash adjuster with its
plunger
at the top. Push the plunger firmly and check that it does
not move.
note |
If the lash adjuster contracts
or moves, perform the operations 7 through 9
again to fill
it with diesel fuel completely. Replace the lash
adjuster if it still contracts or moves after
performing these steps.
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10.Stand the lash adjuster upright to prevent
diesel fuel from spilling out. Do not allow
the lash adjuster to become contaminated by dirt or other
foreign matter. Fit the lash adjuster
onto the engine as soon as possible.
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