Hudson 481 Series Owner's Manual page 40

HUDSON OWNER MANUAL
through a pipe passing through the exhaust manifold, causes the thermostatic coil spring
to release its tension on the choke valve, permitting it to open gradually. Thus as the
engine temperature increases, the choke valve gradually opens, resulting in a leaner
mixture being fed into the engine to meet operating requirements.
Any service required on the Automatic Choke should be referred to your Authorized
Hudson Dealer.
MANIFOLD HEAT CONTROL VALVE—is automatic and requires no adjustment.
FILTER SCREEN CAP (D)—should be removed and the screen cleaned every 2,000
miles.
CARBURETOR AIR CLEANERS
THE OIL WETTED type air cleaner is used as standard equipment on all models. In this
type cleaner the wire gauze is oil soaked and as the air passes through it, foreign particles
are removed, thereby permitting only clean air to enter the carburetor.
At periods of 2,000 miles, or oftener if local conditions warrant, the filter unit should be
taken out by removing wing nut and lifting off cover. Clean off old oil and dirt by dipping
it in kerosene. Blow it dry and re-oil by dipping it in engine oil, using the same grade as
used in the engine. Permit excess oil to drain off and reinstall it in the cleaner.
The OIL BATH air cleaner is available as an option or may be installed by your
Authorized Hudson Dealer. In this unit, dirt is washed out of the air by the oil spray created
as the incoming air strikes the oil in the sump
The oil bath type air cleaners should be serviced
at 2,000 mile intervals or more frequently during
severe dust conditions, as follows:
SIX CYLINDER ENGINES
1. Loosen long clamp screw at base, lift up and
take off cleaner.
2. Remove wing nut at top of cleaner, take out
upper section and wash filter element in
gasoline.
3. Remove old oil, wash out cleaner base and
refill to level indicated with new oil of grade
as used in engine.
4. Replace upper section of cleaner without
oiling filter element and tighten wing nut.
5. Install cleaner on engine and tighten clamp
screw. Do not tighten excessively, as this
may distort carburetor air horn.
6. Remove oil filler pipe air cleaner and wash in gasoline.
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Figure 20