Coolant Pump

Function

It is the coolant pump's task to keep the coolant moving with a rotating tool, without too high pressure. The pump has to be able to cope with more than 100 liters per minute when the engine speed is high. In certain vehicles it is already driven electrically, and is switched on only when required.

How it works

A wheel equipped with ribs is driven by the engine. It is sufficient to have a joined by an interference fit via V-belt. The turning wheel (see 3-rd picture) flings the liquid, which comes in from the middle, to the edge of the round case. There, the outlet port is arranged slightly tangential.
In earlier days, the pumps were integrated into the cylinder block, nowadays they are accommodated in their own cases. From the outside, they are recognizable by the thickness of the inflow- and outlet port. The first picture displays a pump directly driven by toothed belts. The pump in picture 2 is driven from the back, or also on the front of the flat belt. However, in this case, the friction surface will show wear after sometime.

Important

Flow pumps are normally not self-priming.