Hudson 1948 - 1952, Service Manual

Page: 125 / 333

MANIFOLD HEAT CONTROL
(8 Cylinder)
Exhaust and intake manifolds are separate castings bolted
to the cylinder block and also to each other as there are
interconnecting passages through which the exhaust gases
flow to heat the fuel mixture. The amount of exhaust gases
directed on to the walls of the inlet manifold and the dura-
tion of time during which these gases are so directed is
controlled by a heat resistant valve set into the exhaust
manifold. This valve is controlled according to the under
hood temperature by a thermostatic coil spring.
HEAT CONTROL VALVE
(8 Cylinder)
REMOVAL:
NOTE: For removal, follow same procedure as exhaust
manifold removal and, in addition, the following operations:
1. Disconnect spring from lever.
2. Remove cotter key from shaft and remove washer.
3. Remove heat control spring.
4. Remove the two nuts holding cover to manifold, and
remove cover.
5. Remove springs from lower pin and shaft.
6. Use a drift to remove the tapered pin. This will allow
removal of the shaft butterfly.
Installation:
Reverse procedure of removal.
EXHAUST AND
INTAKE MANIFOLDS
(6 Cylinder)
Remove both manifolds as a single unit as follows:
REMOVAL:
1. Remove air cleaner by loosening the attaching screw at
the carburetor air horn.
2. Remove the throttle connection from carburetor.
3. Remove the fuel line and vacuum line from carburetor.
4. Remove heat riser tube from the carburetor.
5. Remove the fourteen nuts and retainers attaching mani-
folds to block and remove manifolds with carburetor at-
tached.
6. Clean off all traces of old gasket material.
Installation:
Reverse the procedure of removal.
HEAT CONTROL VALVE
(6 Cylinder)
REMOVAL:
For removal, follow same procedure as exhaust and
intake manifold removal and, in addition, perform the fol-
lowing operations:
1. Remove exhaust manifold elbow from exhaust manifold.
2. Remove spring, retainer, cotter pin, and heat control
spring.
3. Remove heat riser shaft. Use a hack saw blade to cut shaft
at each side of butterfly. This will allow removal of shaft and
butterfly as an assembly.
NOTE: Counterweight can be salvaged by driving out
retaining pin (weight to shaft).
Installation:
1. Assemble new shaft with counterweight and butterfly.
NOTE: The butterfly should be centrally spaced on the
shaft to eliminate any binding. After determining that
fly is in the open position, securely weld the butterfly
to shaft.
2. Install heat control spring, retainer, anti-rattle spring and
retainer and cotter pin.
3. Install exhaust manifold elbow to manifold.
FUEL SYSTEM & EXHAUST 4 - 41