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11-6
EXHAUST SYSTEM
(7) Inspect the manifolds
for
cracks or distortion.
Test the operation of manifold heat control valve. If
the shaft is binding, apply Manifold Heat Control Sol-
vent,
Part
Number 1879318, as outlined in Paragraph,
"Manifold Heat Control Valve."
Installation
(1) Install a new gasket between the two manifolds
and install the three long screws securing the mani-
folds (Fig. 8 ) .
Do not tighten the screws at this time.
Leave them loose temporarily.
(2)
Position the manifold assembly on the cylinder
head, using a new gasket. Install the triangular wash-
ers and nuts on the upper studs opposite numbers
2
and 5 cylinders and on the six lower studs. The eight
triangular washers should be positioned squarely on
the machined surfaces of both the intake and exhaust
manifold retaining pads. These washers must be in-
stalled with the cup sides against the manifold. In-
stall the nuts and washers only when the engine is
cold.
(3) Install the other conical washers with cup side
against manifold. Tighten nuts to 10 foot-pounds.
CAUTION: Do not over tighten these nuts.
(4)
Tighten the three screws securing the intake
manifold to the exhaust manifold to 15 foot-pounds,
starting with the
inner
screw, then the
two outer
screws.
(5)
Attach the exhaust pipe to the manifold flang?,
using a new gasket and tighten bolt nuts to 35 foot-
pounds.
(6) Install the carburetor and connect the automat-
ic choke rod and throttle linkage. Assemble crank-
case ventilating valve hose, vacuum control tube and
fuel line to carburetor. Install the carburetor air
cleaner, and connect the closed breather cap hose to
air cleaner inlet tube, if used.
TRIANGULbR WASHERS
NY8458
7
Fig. 8-Manifold
Assembly l6-CylinderJ
INTAKE MANIFOLD (273 Cubic Inch Engine)
NOTE: Remove the intake manifold as outlined
in
Group
9,
"Engine."
Servicing
(1) Clean the manifold
in
solvent and blow dry
with compressed air. Inspect the manifold for cracks.
(2)
Inspect the mating surfaces of the manifold for
parallelism with a straightedge.
(3) Inspect the exhaust crossover passages through
the manifold (Fig. 9 ) . If passages are coated with
hard, black carbon, they should be scraped clean and
sandblasted
to
remove the carbon deposits.
(4)
Install the intake manifold, using new gaskets.
Tighten the manifold screws
to
270 inch-pounds.
EXHAUST MANIFOLD (273
Cubic
Inch Engine)
Removal
(1) Remove the bolts and the
nuts
attaching the
ex-
haust pipe to the manifold.
On
the left hand mani-
fold,
remove the bolt, nut and washer attaching the
two manifold braces.
(2)
Remove the bolts, nuts and washers attaching
the manifolds to the cylinder heads. Remove the
manifolds from the cylinder heads.
(3) Clean the gasket surfaces on the cylinder heads
and the manifolds, wash with solvent and blow dry
with compressed air. Inspect the manifolds for cracks.
(4)
Inspect the mating surfaces of the manifold for
parallelism with a straightedge. Gasket surfaces must
be flat within .008 inch.
(5) On the right hand manifold,
test
the manifold
heat control valve for free operation. If necessary to
free up, apply Manifold Heat Control Solvent, Part
Number 1879318, as outlined in Paragraph "Manifold
Heat Control Valve."
Installation
(1) Position the two outboard arms of the mani-
CARBURETOR MOUNTING FLANGE
EXHAUST
CROSSOVER
PASSAGE
7 5
v
8 6
/
\
4
2
AUTOMATIC
CHOKE WELL
~~~$~~
CROSSOVER
~ ~ 1 2 0
Fig. 9 4 n t a k e Manifold
1273 Cu.
In. Enginel
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