Hudson 1938 Terraplane, Owner'S Manual

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Lubrication System
The Hudson Duo-flo Automatic Lubrication System gives positive flow of oil
to every working part of the engine from the moment of starting throughout the
period of operation. It also, through in-built features, conditions the oil so that
all oil supplied by the oscillating plunger pump is cooled and freed of solid matter
and diluents.
There are only two moving parts in the entire system—the oscillating plunger
and the drive shaft of the pump, which is driven by gears directly from the
camshaft. There are no small drilled passages to clog or restrict free flow of oil when
cold. The oil pipes (3 in number) are all located outside the engine and can
readily be removed should there be any necessity to do so.
Crankcase Ventilation and Oil Conditioning
Proper crankcase ventilation is essential to provide for removal of diluents, con-
sisting mainly of unburnt gasoline and condensation, which have harmful effects
on engine oil. Two large crankcase ventilators are provided on the right side of
the engine for this purpose. The temperature in the crankcase is near the boiling
point of these diluents and, with the agitation of the moving parts of the engine,
they are readily vaporized and removed by the slight suction maintained on the
ventilators.
The flow of oil after returning to the crankcase is controlled so that it circulates
around passages adjacent to the cool outside walls of the reservoir and is cooled
before passing through the filter, which removes all solid matter before the oil is
recirculated by the pump.
The filter surfaces are so placed that they are flushed each time the crankcase
is drained and, therefore, require
no
special cleaning nor do they have to be
replaced.
Valve Tappet Adjustment
To assure proper valve clearance under all operating conditions, it is essential
that tappets be adjusted while the engine is at normal operating temperature.
To check or adjust tappets, remove the engine side plates (right side of engine
below intake manifold) and insert a .006" feeler gauge between the top of the
tappet screw and bottom of valve stem of intake valves while engine is running.
Intake valves are numbers 2-4-5-8-9-11, counting from the front of the engine.
An .008" feeler gauge should be inserted between the top of the tappet screw and
bottom of valve stem of exhaust valves while engine is running. Exhaust valves are
numbers 1-3-6-7-10-12, counting from front of engine.
Proper clearance is obtained by turning the tappet adjusting screw to the right
or clockwise direction to increase clearance, and to the left or counter-clockwise
direction to decrease clearance. The tappet adjusting screw lock nut should be
securely tightened after adjustment.
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