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EXHAUST SYSTEM
11-9
CONTRO
Fig. 17-Manifold
Heat Control Valve (273
Cu. In. Engines)
-RATTLE SPRING
Fig. 19-Manifold
Heat Control V a l v e
1273
Cu. In. Engine)
(4)
Center the counterweight on the shaft and turn
the valve counterclockwise until the bumper passes
the stop pin (Fig. 16).
(5) Press the counterweight on the shaft until it
is
seated. Tighten the clamp bolt (Fig. 16) to 50 inch-
pounds with (2-3380 Torque Wrench.
(6) Make sure that the anti-rattle spring on oppo-
site
end of the shaft is in place. Test the operation
of the valve.
MANIFOLD HEAT CONTROL VALVE (273,
318, 361 and 426 Cu. In. Engines)
The application of a few drops of Manifold Heat
Control Valve Solvent, Part Number 1879318, every
six
months, to both ends of the manifold heat con-
trol valve shaft at the bushings will keep the valve
working freely. The solvent should be applied when
the engine is
COOL
and allowed to soak several min-
utes. Work the valve back and forth until it turns
freely.
Operation of the manifold heat control valve (Figs.
17, 18 and 20) should be inspected periodically. With
the engine idling, accelerate momentarily to wide open
throttle. The counterweight should respond by moving
counterclockwise approimately
V 2
inch and return to
a
63x432A
NK989
Fig. 20-Manifold
Heat Control Valve-Rear
Outlet Manifold (361,383 and 426 Cu. In.
f i g . 1 8 4 a n i f o l d Heat Control Valve
(318 Cu. In. Engine)
Engines)
its original position. If no movement is observed, the
shaft
is
binding due to accumulation of deposits
or
the thermostat is weak
or
broken.
Removal (All 8 Cylinder Engines Except
318 Cu. In. Engine)
(1) Remove the counterweight, lodk and bumper
from the end of shaft by loosening the clamp bolt
(Figs. 19,20 and 21).
(2)
Unhook the thermostat from the stop pin and
remove from the valve shaft slot.
Counterweight-Removarl (31 8 Cu.
In.
Engine)
(1) Remove the counterweight and the bumper
from the outer end of the valve shaft by loosening the
clamp bolt (Figs. 18 and
22).
Thermostat-Removal
(31 8 Cu. In. Engine)
(1) To replace the thermostat on the inner end of
the valve shaft, first remove the anti-rattle spring
(Figs. 18 and 2 2 ) .
(2)
Unhook the thermostat from the stop pin and
slide from the valve shaft.
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