Hudson 1947 3/4-TON COMMERCIAL, Руководство пользователя

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passing through the oil in the troughs causes it to be violently sprayed against the inside of the
crankcase. The mist thus created heavily coats all working parts, providing them with a
protective film of oil. See Fig. 11. A portion of this oil is caught in channels cast in the side
of the crankcase and is fed by gravity into large reservoirs located directly over the crankshaft
and camshaft bearings. The rotating action of the crankshaft and camshaft draws the oil into the
bearings, affording a constant, positive supply of lubricant.
The overflow of oil from the front and rear troughs toward the center of the engine
provides oil to the adjoining troughs. As this oil reaches the center of the tray it is
returned to the lower reservoir where it is cooled and strained by circulating through a
series of labyrinthian passages and fine mesh screens.
COOLING SYSTEM
A pressure pump circulating type cooling system, incorporating thermostatic control, is
used on all Hudson models.
Series 171, 172, 173 and 178 use the choke type thermostat which is located in outlet (C),
Fig. 12, and prevents circulation of the cool-
ant through the radiator core until such
time as the water reaches a temperature of 150°
to 155°, when the thermostat begins to open.
At 185° the thermostat should be fully opened.
The path of water circulation is as illustrated.
Series 174, which uses a by-pass type water
pump, is equipped with a by-pass type thermo-
stat, located in outlet (D ), Fig. 13. This type
thermostat, although restricting water circula-
tion through the radiator core, does permit cir-
culation through the by-pass (C) in the
pump and back into the cylinder b l o c k .
T h i s t h e r m o s t a t a l s o b e g i n s to open
at 150
°
to 155
°
and is fully opened at 185°.
TO DRAIN the radiator only, turn handle
of the drain cock located a I the lower left corner of the radiator, counter-clockwise. To
drain the complete cooling system also remove the pipe plug located at the left rear
corner of the cylinder block.
Note: If it becomes necessary to drain the radiator when it
contains anti-freeze and it is desired to save it, a 7/16" inside diameter hose may be fitted
over the end of the drain cock and the loose end placed in a container.
PROPER CARE of the cooling system is highly essential to maintain efficient engine
operation. Rust and scale in the cylinder block is a natural product of water and iron.
Therefore, unless the necessary precautions are taken to prevent this accumulation, which acts as an insu-
28 HUDSON OWNER’S MANUAL
Figure 12