Lesson 5/Learning Event 2
The impeller shaft turns on bearings in the housing and has a pulley attached to its outer end. A seal assembly
prevents coolant from leaking out by the impeller shaft.
The pump is driven by a V-type belt that generally fits in the pulleys on the crankshaft, generator, and coolant
pump.
Radiator
It is not enough just to pump coolant out of an engine and back into it again. When the coolant leaves the
engine, it is quite hot. If this hot coolant was pumped right back into the engine, all the coolant would start to
boil soon. Therefore, before the coolant can be used again, it must be cooled. This is the job of the radiator.
A radiator has two tanks or containers connected by a center section called the core. The top tank contains an
inlet, a filler opening, and an overflow tube. The bottom tank has an outlet and drain openings. A frame for
mounting the radiator in the vehicle is soldered to the upper and lower tanks.
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