4919813 Cummins Diesel Engine NH220 NH250 Water Pump

What Causes Water Pumps to Fail?

Water pumps can fail prematurely due to corrosion inside the cooling system or from an imbalanced water-pump shaft. But in most instances, water pumps fail because of shaft leaks.

If a water pump is expected to last 100,000 miles without any issues, that’s about 110 average-size swimming pools one little pump would fill in its lifetime. It’s hard to imagine that a pump could last so long – and many do – but many fail prematurely due to other cooling-system factors.

Water pumps can fail prematurely due to corrosion inside the cooling system or from an imbalanced water-pump shaft. If there’s a mechanical fan mounted on the water-pump shaft, vibrations are the result of a bent fan blade, which can lead to the shaft cracking or breaking. A bent pulley also can cause the same damage. Excessive tension on a fan belt or serpentine belt also can overload the water-pump shaft bearings and cause the pump to fail. But in most instances, water pumps fail because of shaft leaks.

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