Schaeffler provides coolant pump installation guidelines to avoid warranty issues

To help workshops avoid warranty issues, Schaeffler’s technical experts have highlighted the most common coolant pump installation errors they have encountered, and shared best practice guidelines to help technicians carry out efficient and reliable cooling system repairs.

One of the most frequent causes of coolant pump failure is the incorrect application of sealant. Before installing a new pump, the engine’s sealing surface must be cleaned using a sanding fleece to ensure no dirt or old residue enters the coolant circuit.

Sealant should also never be applied unless advised in the vehicle manufacturer’s installation instructions. If a manufacturer does recommend the use of sealant, it must be applied in the correct location and in the precise quantity advised.

Applying too much causes the excess sealant to enter the cooling circuit, which then migrates to the coolant pump shaft and destroys the seal, resulting in coolant leakage.

Another frequent mistake made which can lead to severe damage is the improper filling of the cooling system, as a coolant pump must never be run dry. Operating the system without liquid, or filling it with water before adding coolant, can lead to damage of the both the seal packs and the pump.

To make installation easier, Schaeffler recommends first placing the pump into coolant to lubricate the critical components. Technicians can then turn the engine on safely after installation, as the pump has been pre-lubricated and should therefore not be damaged.

Schaeffler also strongly recommends the use of a vacuum filling device to ensure there is no air in the cooling system and it is filled correctly.

By following these simple guidelines, Schaeffler hopes that costly error can be avoided for both the workshop and their customer, and ensure a reliable and long lasting cooling system repair.