In the second part of the series, MEYLE’s experienced specialists identify some more external factors that are responsible for early water pump failure.
Coolant and Antifreeze
The problem
Improper use of coolant. The coolant used is not specified for the given engine or the mixing ratio is incorrect. At worst, there is no coolant at all or the water is contaminated. Mixing incompatible coolants results in even greater damage.
Possible effects
- Thermal damage
- Frost damage
- Chemical reactions
- Deposits
- Corrosion and cavitation damage
The solution
Check the antifreeze concentration using a spindle (recommended value: -20 to -30°C). Use MEYLE antifreeze or the product authorised by the manufacturer, as specified in the installation manual. Do not blend different types of coolant. Important: Coolants must be treated as heavy metal waste and disposed of accordingly!
Pre-damage of the mechanical seal
The problem
Failure to bleed the cooling system correctly can cause flow breakaway and insufficient coolant circulation. This will reduce cooling performance and result in overheating and damage to the engine and/or its components.
Possible effects
- Overheating and ultimately destruction of the mechanical seal (thermal damage and/or material disintegration)
- Leakage
The solution
Bleed the cooling system according to the manufacturer‘s specifications. If no coolant is discharged into the expansion tank, turn off the engine and bleed the cooling system again. Do not allow the water pump to run dry at any time.
Sealants
The problem
Cooling system contaminated, owing to the incorrect use of silicon sealant.
Possible effects
- Mechanical seal damage
- Clogging of the coolant system
The solution
Only use the sealant provided with the MEYLE product or recommended by the vehicle manufacturer. Use silicon sealant sparingly and protect the cooling system from sealant ingress.
