This water pump seal is a critical component designed to prevent coolant leakage from the water pump housing where the shaft exits. It is constructed from durable, chemically resistant materials to withstand the harsh environment of the engine cooling system, unlike a worn seal that will allow coolant to escape. Operators may notice a persistent coolant leak originating from the water pump area, a sweet smell of burning coolant, or a low coolant level warning if this seal fails.
Always verify with serial number before ordering.
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Alternate part numbers that interchange with Volvo 20430678
Fitment: Volvo Trucks: FH13: 2006> 2007, FM13: 2006> 2007, Renault Trucks: Premium II TR/PR, Kerax /DXi11/13, Magnum DXi12/13, C-Range, K-Range, T-Range, Volvo Bus
Inspect mating surfaces for wear before fitting. Use torque specs from service manual. Replace gaskets and seals as a set — reusing compressed gaskets causes oil leaks. Clean all oil passages with compressed air.
Always consult the OEM service manual for model-specific torque values and procedures. WhatsApp our technical team if you need fitment guidance.
The first sign of a failing water pump seal is usually a visible coolant leak from the water pump weep hole or shaft area. If left unaddressed, the leak will worsen, leading to a gradual loss of coolant and potential engine overheating. A complete seal failure can result in significant coolant loss, potentially leading to severe engine damage if the equipment continues to operate.
Carefully inspect the water pump shaft for any scoring or damage that could compromise the new seal's effectiveness. Avoid hammering the seal directly; use a proper seal driver or a socket of the correct diameter to press it in evenly.
When replacing the water pump seal, it is highly recommended to also inspect and potentially replace the water pump bearing and impeller.