REPAIR INSTRUCTIONS, PART 1
Page 319
368
Figure 368 — Head Bolt Torque Sequence Chart
Exhaust Manifold Installation
[214 EG]
MANIFOLD STUD INSTALLATION
It is recommended that all 12 manifold mounting
studs be replaced any time the exhaust manifold
has been removed.
Lower exhaust stud holes intersect with the push
rod holes; upper exhaust holes may intersect as
well. This requires that all exhaust studs be
sealed at installation to prevent oil leakage.
Replacement studs from the MACK Parts System
come with thread sealer pre-applied.
On some engines, the lower or upper exhaust
manifold-to-cylinder head stud hole may be
drilled deep enough to allow the stud to enter the
push rod bore. In these instances, the 20 lb-ft
(27 N
폷
m) of torque may not be reached until the
stud contacts the push rod. In all cases, a stud
protrusion of 1.75 inches (44.45 mm) must be
maintained, even if the full torque of 20 lb-ft
(27 N
폷
m) is never reached. Refer to Figure 369.
369
Figure 369 — Exhaust Stud Protrusion
5-111.bk Page 319 Monday, July 10, 2006 2:26 PM
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