Hudson 1948 - 1952, Service Manual

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1 - 8 LUBRICATION
When starting the engine the release valve has moved to a
position that closes the oil passageway to the oil filter and
allows full pump flow direct through the main oil gallery
extending the full length of the crankcase. This oil gallery is
intersected by drilled leads to main and camshaft bearings
and valve lifters.
Oil pressure is supplied to the connecting rod bearings
through the drilled crankshaft.
The angular hole drilled through the upper half of the
connecting rod bearing shell seat is for the purpose of lubri-
cating the cylinder walls. A tube fitted in the front end of
main oil gallery directs a small pressure stream of oil at the
point where chain meshes with crankshaft sprocket. Re-
turned oil flows over the wide shallow portion of the oil pan
where it is cooled before reaching the sump.
The oil measuring gauge seats on a tube pressed in the
crankcase at left rear side. A sealed pressure type oil signal
switch mounted just above the oil pump and connected with
the main oil gallery, is wired to the dash oil signal light.
Should oil pressure drop below approximately 13 pounds,
the circuit is completed and lights the red dash oil pressure
signal. Capacity of the oil pan is 7 quarts for refill and 7-1/2
quarts when pan is removed for cleaning.
The total engine oil capacity is 7-1/2 quarts for six
cylinder and 8 quarts for eight cylinder engines. When the
oil is drained in the conventional manner, the refilling quan-
tity is 7 quarts for both six and eight cylinder engines.
When the oil pan is removed for cleaning or during
service work, two quarts should be placed in the oil pan tray
of eight cylinder engines before the pan is Installed. The
remaining seven quarts should then be placed in the pan
through the crankcase filler opening. In six cylinder engines
the entire quantity is poured through the crankcase oil filler
pipe.
An engine in normal operating condition is expected to
use some oil, and it is therefore not unusual to add oil
between change periods. Its rate of usage is governed by the
individual engine and is dependent on operating speeds,
temperatures, and the viscosity and quality of the oil used.
The oil level should be checked each time fuel is added.
The gauge is located on the left side of the engine and is
marked to show the "Oil Level Range" and the "Low Mark",
Figure 5.
FIGURE 5
For normal operation the oil level is satisfactory when it
is within the "Oil Level Range". For high speed operation
the level should be maintained at the full mark which is the
top line on the "Oil Level Range".
To make an accurate check, wait a minute or two after
shutting off the engine to permit the oil to drain back into
the oil pan. Approximately three and one-half quarts of oil
are required to bring the level from low to full in both six
and eight
CHECKING ENGINE OIL LEVEL
ENGINE OIL CAPACITIES