Hudson 1948 - 1952, Service Manual

Page: 47 / 333

LUBRICATION
8 CYLINDER
Engine lubrication is by the Duo-flow system which
delivers the lubrication oil in ratio to engine speed to all
bearing surfaces immediately from the first turn of the
crankshaft.
The oil is drawn through a pipe connecting with a
floating screen in the oil pump by the oscillating plunger
type oil pump which is driven from the camshaft.
Oil is forced through oil lines to the front and rear of the
engine where it is then deposited in the splash troughs of the
oil pan tray.
The oil is then picked up by the connecting rod dippers
and vigorously distributed to interior working surfaces by
the splash system and a series of channels which convey it
to wells over the crankshaft and camshaft bearings.
Overflow oil running down the Crankcase wall is diverted
by drain troughs in the oil pan tray until it reaches the center
splash troughs.
LUBRICATION
6 CYLINDER
Full pressure lubrication to friction surfaces of the
engine is maintained by a rotor type centrifugal pump
mounted on the right side of the cylinder block. The
pump is driven by a worm gear on the camshaft. Oil is
drawn through the suction side of the pump by means of
a pipe connecting to a floating screen in the oil pan. The
oil is then forced up into the horizontal oil gallery for
distribution to the valve tappets, camshaft bearings, main
bearings, connecting rod bearings, pistons, piston pins
and bushings, timing chain and sprockets and all other
movable parts requiring lubrication, Figure 8.
NOTE: Normal oil pressure is 40 lbs. at 30 MPH.
OIL CHECK VALVE
8 CYLINDER
The check valve assembly shown in Figure 2 is used in
conjunction with the oscillating plunger type oil pump.
The function of the check valve is to indicate oil flow by
building up enough pressure to operate the oil pressure
indicator light on the instrument panel. This operating pres-
sure ranges from 4 to 12 pounds.
FIGURE 2
1. Valve body
2. Valve body plug
3. Valve body plug gasket
4. Valve ball
5. Valve plunger
6. Valve plunger spring
7. Valve plunger pin
8. Valve plunger pin retainer
9. Valve pressure indicator pin
10. Pressure indicator pin gasket
11. Pressure pin terminal nut
12. Pressure pin contact nut
13. Pump to check valve pipe elbow
The unit consists of a housing in which is carried the
check ball (4) and a plunger (5) which operates against the
pressure of a spring (6).
When there is no oil flowing and therefore no pressure,
the plunger is pushed down by the spring and contacts an
insulated pin (9) which is the ground for the signal light.
The light will burn until sufficient oil pressure is developed
to raise the plunger.
A bleed path is provided between the plunger and pin
(7) to allow a small quantity of oil to pass by the piston to
the outlet. This hole must be kept clean or the lamp will not
light immediately when the oil flow stops because the
ENGINE 3 - 5