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EXHAUST SYSTEM AND INTAKE MANIFOLD
11 - 13
MANIFOLD HEAT CONTROL VALVE (FIG. 16)
REMOVAL
(1) Remove the r i g h t exhaust manifold.
(2) Position the valve plate and g r i n d off t h e spot
welds from valve plate a n d shaft.
(3) Remove the a n t i - r a t t l e spring.
(4) Remove counterweight and shaft assembly.
(5) Press out the bushings and seals from t h e ex-
haust m a n i f o l d .
(6) Inspect the vent holes and clean out, i f neces-
sary.
INSTALLATION
(1) Press cup seals i n (cupped ends facing outward)
u n t i l seals extend i n t o manifold 2.54 m m (0.100 inch)
on each side.
(2) Press i n bushings flush w i t h outer edge o f ex-
h a u s t manifold.
(3) L i n e r e a m bushings and seals t o 7.8163-7.8994
m m (0.3095-0.3110 inch) diameter. D o n o t u s e 7.9
m m (5/16 i n c h ) r e a m e r . Test for free f i t of shaft i n
bushings and seals.
(4) I n s t a l l valve stop i n slot o n counterweight so
looped ends face o u t w a r d , away from t h e counter-
w e i g h t shaft hole (Fig. 16).
(5) Position thermostat so the center end or t a b is
p o i n t i n g to t h e left a n d the hook or outer end points
down. I n s t a l l thermostat o n the counterweight.
(6) A t 32.00 m m (1.24 inch), m a r k one end o f shaft
w i t h a suitable dye. Press counterweight o n t h e
m a r k e d end o f the shaft u n t i l flush w i t h shaft end.
(7) W i t h t h e counterweight end of the shaft facing
you, w r a p t h e thermostatic spring 140° i n a counter-
clockwise
direction.
I n s t a l l
t h e shaft
assembly
t h r o u g h outer bushing, seal and valve plate w i t h the
center strap facing t h e flange end o f the manifold.
A t t a c h hook end of thermostatic spring t o stop p i n .
(8) Position t h e counterweight end of the shaft a t
t h e 32.00 m m (1.24 inch) m a r k . W i t h the valve plate
centered
between
t h e seals a n d t h e valve
plate
closed, arc w e l d valve plate to shaft w i t h a stainless
steel r o d . A r c welding ground m u s t be made a t coun-
t e r w e i g h t .
(9)
Test
for free
operation.
I n s t a l l a n t i - r a t t l e
spring.
(10) I n s t a l l exhaust manifold. T i g h t e n the bolts t o
27 N * m (20 f t . lbs.) a n d the nuts to 20 N*m (15 f t .
lbs.) torque.
(11) I n s t a l l t h e exhaust pipe t o manifold. T i g h t e n
t h e n u t s to 33 N»m (24 ft. lbs.) torque.
Fig. 16 Manifold Heat Control
Valve
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