REPAIR INSTRUCTIONS, PART 1
Page 333
4. Again, depress the rocker arm screw end of
each rocker arm into each push rod and
rotate each push rod to ensure proper
installation.
5. Beginning at the center mounting bracket
with bolt No. 1 (as shown in Figure 389),
tighten each rocker shaft mounting bracket
bolt evenly (in the sequence shown in
Figure 389), keeping the rocker shaft
assembly level until the brackets are against
the cylinder head. When the brackets have
contacted the cylinder head, tighten the
mounting bracket bolts in the sequence
shown, using a two-step process; first
tighten the mounting bolts to 25 lb-ft
(34 N폷m), then, using the same sequence,
tighten the mounting bolts to 45 lb-ft
(61 N폷m).
The mounting bracket-to-rocker shaft bolts at the
center and rear mounting brackets must be
FINGER-TIGHT ONLY when the rocker shaft
assembly is being installed on the engine. This
allows the slip-fit mounting brackets to align and
properly seat firmly on the cylinder head surface.
After the rocker shaft mounting bolts have been
tightened to the proper specifications, the
mounting bracket-to-shaft bolts must then be
tightened to proper specifications. This ensures
that there is no possibility of any relative motion
between the mounting bracket and the rocker
shaft. Failure to follow this assembly procedure
can result in broken hold-down bolts, broken
shaft or both, with the possibility of major engine
damage.
389
Figure 389 — Tightening Sequence — Rocker Shaft Mounting Bracket and Locating Bolts
6. After the rocker shaft mounting bracket bolts
have been properly tightened (bolt Nos. 1
through 6 in Figure 389), tighten the center
and rear mounting bracket-to-rocker shaft
locating bolts (bolt Nos. 7 and 8 in
Figure 389) to 18 lb-ft (24 N폷m). The front
mounting bracket-to-rocker shaft bolt (bolt
No. 9 in Figure 389) can be tightened to
23 lb-ft (31 N폷m) anytime during the process.
Whenever the rocker shaft assembly is removed
for any type of service procedure, the mounting
bracket-to-rocker shaft locating bolts must be
loosened. Upon reassembly, the rocker shaft
mounting bracket bolts must be tightened as
outlined in the procedures above, or serious
engine damage may result.
5-111.bk Page 333 Monday, July 10, 2006 2:26 PM
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