Air Cleaner - Hudson 1953 Jet Mechanical Procedure Manual

2. Connect vacuum line from distributor to carburetor
(F) and gas line from fuel pump to carburetor (G).
3. Connect heat riser tube from exhaust manifold to
carburetor (H) and throttle to carburetor, install
clamp.
4. Adjust and test carburetor for maximum
performance.
5. Install air cleaner.
NOTE: Do not tighten air cleaner clamp so tight
that carburetor air horn will be distorted
.
AIR CLEANER, DRY
(OIL WETTED TYPE)
The oil wetted type air filter can be cleaned by
removing the attaching wing nut and lifting out the
unit. Clean off old oil and dirt by dipping in kerosene
and blowing dry. Re-oil by dipping unit in engine oil
(using the same grade as used in the engine). Permit
excessive oil to drain off and reinstall unit in the
cleaner.

AIR CLEANER

(OIL BATH)
1. Loosen long clamp screw at cleaner base, lift off
complete cleaner.
2. Remove the wing nut at top of cleaner, lift out filter
element and wash element in kerosene. DO NOT
oil.
3. Remove oil, wash out base and refill to level indi-
cated with one pint of S.A.E. 50 oil at tempera-
tures above 32° and S.A.E. 20 oil at temperature
below 32 degrees.
FIGURE 13
FUEL SYSTEM & EXHAUST 48
FUEL PUMP
A Carter mechanical fuel pump M-729SZ Fig-
ure 13, is used as standard equipment. A combina-
tion fuel and vacuum pump is also available as an
option. The pump cam lever (A) fits under an
eccentric on the camshaft. Rotation of the cam-
shaft forces the cam lever down against the dia-
phragm spring (G) pressure, raising the diaphragm
(H). Fuel is drawn into the fuel chamber through
the inlet port (L) screen (M), and the inlet valve (I).
When the low side of the eccentric is against the
cam lever, the diaphragm spring forces the dia-
phragm down, expelling fuel through the o u t le t
valve (N) and outlet port (K) to the carburetor bowl.
Continued pump operation fills the carburetor
bowl, and the float needle valve closes the carbu-
retor inlet. Fuel pressure built up in the pump fuel
chamber opposes the diaphragm spring, resulting
in shorter strokes until the pump stops completely.
Normal diaphragm stroke is about 1/64".
FUEL PUMP TEST
1. Make sure all connections and cover screws are
tight after replacement.
2. Disconnect the fuel line at the carburetor and
connect the fuel pump pressure gauge.
3. Start the engine and run at 1800 R.P.M. Pre s
sure should be 4 to 5 pounds. Stop engine and
watch pressure gauge. Pressure should not fall
perceptibly.
4. If pressure falls, leaking pump valves are
indicated.
5. If pressure s below specifications, attach vac-
uum gauge to inlet port of pump and operate
engine. Gauge should show 6" of mercury or
higher for satisfactory operation.
6. If fuel pump pressure is low, but vacuum reading
satisfactory, difficulty is in the gasoline tank or
lines to the pump.
7. If pump pressure and vacuum are both low,
pump should be repaired or replaced.