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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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