Hudson 481 Series, Owner'S Manual

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HUDSON OWNER MANUAL 31
COOLING SYSTEM
The cooling system is of the pressure type, employing a cellular, tubular radiator,
centrifugal pump and four blade fan.
The water pump has a large six vane impeller
and the shaft is mounted on a double row ball
bearing with grease sealed in and requiring no
lubrication attention. A new type spring loaded
bellows seal and composition thrust washers
prevent leakage around the shaft.
By-pass type thermostats are used which
permit quick engine warm-up by restricting the
coolant circulation through the radiator and
by-pass it around the cylinder block. The ther-
mostat begins to open at temperatures of from
150 to 155 degrees and is wide open at 185
degrees.
A large 4 blade fan, with blades unevenly
spaced to minimize sound, is used.
COOLING SYSTEM CAPACITY-6 Cylinder Models-17 Quarts
8 Cylinder Models-18 Quarts
TO DRAIN the radiator only, turn handle of the drain cock located at the lower right
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 antifreeze and it is
desired to save it, a piece of 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 insulator, so-called "hot spots" may result through the inability of the water to cool
the cylinders and the area adjacent to the valve seats.
The use of Hudson Rust and Corrosion Inhibitor in the cooling system prior to adding
anti-freeze in the fall and after draining in the spring will assist to a large measure in keeping
the system clean and permit efficient circulation. This product is available through all
Authorized Hudson Dealers.
FAN BELT
The fan belt is of the "V" type and drives the water pump and generator through the
vibration dampener pulley.
Figure 17