21781059 Volvo FH FH4/FH5 D13K Water Pump

What does a water pump do?

The water pump is a vital centrifugal-type component within the engine cooling system, responsible for continuously circulating coolant between the engine block, cylinder head, and radiator. By maintaining consistent coolant flow, this part prevents engine overheating and ensures optimal thermal regulation during heavy-duty operation.

Vehicle and engine compatibility

This specific water pump is designed to fit Volvo FH (FH4/FH5) models featuring the D13K engine. It functions as a reliable replacement for original equipment, ensuring the cooling system operates within required temperature parameters for heavy commercial vehicle engines.

Installation and maintenance

For optimal performance, technicians should inspect the pump during routine belt or timing belt service. When replacing the unit, it is recommended to check related components such as the thermostat and radiator hoses to ensure full system integrity and prevent premature wear of new high-strength components.

Troubleshooting guidance

Monitoring for symptoms such as coolant leaks from the weep hole or unusual bearing noise can help identify potential failures before they lead to engine overheating. Consult your authorized distributor to ensure perfect fitment for your specific engine configuration.

OE cross-reference

525.03.0009 (Water Pump Water Pumps) is the equivalent of the Volvo OE number. This part directly replaces Volvo OE number 21781059.