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Water Pump Failures and Causes

December 1, 2016

Failure Symptom: 1. Seal Leakage-Dirty System Evidence of seal leakage from weep hole. This pump has been in service only a short time before rusty-looking coolant began to leak out of the weep hole, leaving behind large deposits of rust and calcium.  The figure below shows a buildup of rust particles with a mud-like consistency…

Galvanic Effect

An important concept regarding the endurance and performance of the water pump is electrolytic metal erosion or EME. This is also referred to as the galvanic effect. With the ever-increasing use of dissimilar metals in engine components, plus the higher reliance of electronics, the problem of EME is brought to the forefront. This electrical activity…

Low Flow

Many believe that the number of fins or vanes on the impeller directly increases the pressure and flow through the water pump; however, this is not necessarily true. The number of vanes or fins is not the driving factor for increased flow. It is actually the impeller clearance that increases flow and performance. Impeller clearance…

New vs. Remanufactured Water Pumps

Do It Right. Do It Once. Water pump damage occurs over time as heat and contaminants destroy the internal parts of the pump. Some of this damage is quite obvious, but bearing wear or impeller deterioration may not be so visible. If these components are reused in remanufacturing, their performance can compromise the system, reduce…

New Water Pump Designs Stop the Crying

New Water Pump Designs Stop the Crying Have you ever noticed that when you replace a water pump the replacement pump doesn’t look quite like the OEM pump you removed?  Sometimes there are what appears to be a freeze plug and another boss on the pump housing.  Why the difference? Why They Weep Coolant has…

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