The BMW 2500 Water Pump prevents an engine from becoming too hot by pushing coolant around the block and the radiator, carrying the heat away before it can do damage. Many often driven by a crankshaft belt, this trusted BMW cooling element utilizes an internal shaft that spins an impeller. At this point, coolant gets pushed from the lower radiator hose into the water jacket. From here, it is onward toward the thermostat and radiator to get back into a continual loop. Earlier models were made of heavy cast iron bodies; however, many later ones changed to light aluminum castings but continued with the same basic pulley bearing shaft and seal pattern. Each Water Pump has a tight shaft seal to keep the coolant away from the bearings. The shaft seal allows the Water Pump to run without leaking and without squeaking. In addition, as long as the Water Pump is working, circulation is steady. A clogged Water Pump can rapidly overheat the inline six. A small number of the 2500 models adopted an electric style in recent times, taking away the belt to allow for an electric motor to spin the impeller for better flow at low revs, a move that classic 2500 fans approved of. BMW sedans can remain cool when the Water Pump is replaced in time as a failing pump will cause coolant to leak out, produce a grinding sound, and lead to overheating.
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