Rocker Arm Repair
When your rockers
go from clickety click to clack clack it is time to pull that valve cover
and take a look. Much of the time the problem is quite obvious. One
common problem is that an adjuster has come loose.
|This could be from not
getting it locked down well when you adjusted the valves last or it
could be a stripped lock nut. Another
not so obvious problem is a broken spring shim between the rocker
|This allows the rocker
to bang back and forth on the shaft. If you look closely you can see
the extra gap and you can move the rocker when in the TDC position.
|To fix this you will need
to unbolt the rocker shaft from the head and then remove the clip
from one end.
|Now you can slide the
rockers and shims off the shaft. Pay close attention to how they are
all arranged. While you have the shaft apart it is a good opportunity
to rotate the shaft 180 degrees so that the rockers are now running
on what was the back side of the shaft.
|This surface should still
be like new. Another problem that we are seeing more of now that the
cars are so much older is broken pushrods due to metal fatigue.
|When they are broken in
two it is quite obvious but occasionally they will mushroom and this
takes a closer look. Of course this can be fixed by merely replacing
the pushrod and readjusting the valves. Last but not least you could
have a broken valve spring. Again this is usually very obvious but
not an easy fix. Unless you have are familiar with head and valve
work this one you may need to take to the shop. This whole operation
can be seen on Bug Me Video Volume 3.
Bug Me Video, Inc.
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