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Possible causes of water pump failure

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tschida
10 diapositives · 242 Views · Jan 02, 2020

This guide explores eight possible causes of water pump failure in automotive cooling systems, such as corrosion, contaminated coolant, improper sealant application, and timing belt tension issues. Learn how chemical damage, vibration overload, and corrosion can lead to impeller wheel damage and bearing fatigue. Understand the importance of cleaning and replacing damaged components to prevent contamination and wear in the cooling system. Discover how neglecting maintenance can result in leaks and decreased performance of the water pump over time.

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Possible causes of water pump failure
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  1. Possible causes of water pump failure

  2. 1. Traces of condensate or streak-like sediment on the leakage hole. Possible cause: Rings of coolant and steam leakage are possible. Complaint because of leakages is not justified. Possible causes of water pump failure

  3. 2. Discharge of coolant at the leakage hole. Possible cause: corrosion in the cooling system. The cooling system was operated with pure water. Possible causes of water pump failure

  4. 3. Impeller wheel and housing badly damaged by pitting corrosion. Possible cause: expended cooling water with a large proportion of chlorides and salt compounds in combination with high temperatures. Possible causes of water pump failure

  5. 4. Water discharge at tube connector and housing seal. Possible cause: Seals provided were not used. Sealant not applied properly. Possible causes of water pump failure

  6. 5. Tooth profile of the driving wheel slightly worn and rubber abrasion on the tooth flanks Possible cause: timing belt too tight Possible causes of water pump failure

  7. 6. Fatigue fracture of the water pump bearing. Bearing cage and ring adapter ruined. Possible cause: vibrations and imbalance caused by defective fan clutch, leading to the pump bearing being overloaded Possible causes of water pump failure

  8. 7. Heavily-corroded impeller wheel running surface. Possible cause: chemical damage to the slip rings caused by contaminated coolant Possible causes of water pump failure

  9. 8. Corrosion in the entire cooling system. Possible cause: defective cylinder head gasket. Motor exhaust reaches the cooling system causing the pH value to fall. Possible causes of water pump failure

  10. It should be taken into account that coolants are highly dissolvent for deposits in the cooling system and have a much higher penetration capacity than pure water. If the cooling system has not been cleaned and components damaged by corrosion were not replaced, abrasive mini-particles become detached after the system has been filled with new coolant, and these remain in the uncleaned motor. The consequence of this is that the cooling system becomes contaminated as the vehicle is operated. The particles inevitably find their way into the sealing gap of the mechanical seal. This seal needs the coolant as a lubricant. All types of deposit accelerate wear and tear and adversely affect the sealing function. Consequence: The water pump soon leaks more than is permissible. Possible causes of water pump failure