Page 384
REPAIR INSTRUCTIONS, PART 2
4. At the locations recorded in steps “a” and “b”
above, the rotators must be replaced. Be
sure to use a magnet to clean all the pieces
of broken rotator springs from the valve
spring seat counterbores before the valve
springs and rotators are reinstalled.
If the above inspections, plus any obviously failed
rotators, determine that replacement of 12 valve
rotators is necessary, then all 24 rotators should
be replaced.
If a significant amount of coil spring pieces are
found on the magnetic drain plug and cylinder
head top surface, but the inspections performed
in steps “a” and “b” indicate that less than 12
rotators must be replaced, all rotators should be
removed and the valve spring seat counterbores
checked for pieces of coil spring. Any location
where pieces of coil spring are found require that
the rotators be replaced.
Failure to replace a rotator that has a broken
spring will result in complete failure of the rotator,
and will eventually lead to major engine damage.
VALVE LIFTER H-RING
DISLODGEMENT AND
ALIGNMENT INSPECTIONS
(IN-CHASSIS)
[213 CH]
After the camshaft has been removed, the valve
lifter H-rings must be inspected for dislodgement
and alignment. H-ring dislodgement is checked
by using a piece of welding rod as described in
the following procedure; whereas, H-ring
alignment checked with special tool No. J 46083
is described in the procedure outlined under
“Alignment Inspection.”
The H-ring alignment checking tool cannot be
used to determine if an H-ring has been
dislodged and pushed up into the lifter bore.
H-ring height must be checked using the
following “Dislodgement Inspection” procedure.
Any valve train failure that results in excessive
valve lash or subjects the lifter body to rotational
force can result in the H-ring being dislodged, or
rotated out of proper alignment. This can be
caused by a cam/lifter failure or by breakage of a
rocker arm, rocker arm shaft or mounting bolts.
When any such failure has occurred, inspection
of the lifters and H-rings must be conducted to
ensure that the H-rings are properly aligned. An
existing out-of-alignment condition that is not
corrected will result in subsequent cam/lifter
failure.
5-111.bk Page 384 Monday, July 10, 2006 2:26 PM
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