EXAMPLES OF WATER PUMP FAILURE MODES
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Transcript of EXAMPLES OF WATER PUMP FAILURE MODES
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EXAMPLES OF WATER PUMP FAILURE MODES
David Lewis Jan 2014
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Failure modes
• Corrosion• Cavitation and Erosion• Electrolysis• Body damage (Cracking)• Dirt or incrustations• Excessive use of gasket sealant• Impeller cracks• Overload (Tension)
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Corrosion
CAUSE
Use of Non specified manufacturer coolant
Top up with Water only
RESULT
Rust contaminates the cooling system and results in leakage.
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Cavitation and Erosion CAUSE• Incorrect bleeding
of cooling system• Temperature
exceeds boiling point
RESULT• Loss of flow, holes
in casting leading to leakage
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Electrolysis
CAUSE• Low PH value causes acidic
action.
• Incorrect coolant
RESULT
• Reduced flow and over heating
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Body Damage (Cracking)
CAUSE• Over tightening of bolts• Non sequential tightening of
bolts• Porosity (Unlikely)
RESULT• Unable to fit pump• Pump leaks in service
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Dirt or Incrustations
CAUSE• Engine not flushed
out when changing cooling system components
RESULT• Damages the
surface of the mechanical seal.
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Excessive use of gasket sealant
CAUSE • Over application
to ensure it fits first time and doesn’t leak
RESULT• Sealant strands
detach and force themselves between the unitised seal
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Impeller Cracks
CAUSE• Poor handling of
pumps
RESULT• Loss of interference
between impeller and centre spigot
• Gradual erosion of the impeller
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Overload (Tension)
CAUSE• Don’t follow
vehicle manufacturers instruction
• Belief in Automatic tensioners
Result• Bearing failure• Extreme Engine
damage (Particularly in synchronous drive)