Type 25 Water Pump - 1983-85 - Waterboxer Engines

This replacement water pump is designed for all 1900cc petrol Waterboxer engines fitted to Type 25 / T3 buses from 1983 to 1985. It is the correct early-style pump with offset inlet bolt holes, not the later round-hole design, ensuring proper fitment on the original 1.9 Waterboxer cooling system.

The water pump is a vital component of the cooling system, responsible for circulating coolant through the engine, cylinder heads, radiator, and heater circuits. Driven by the engine, it keeps operating temperatures stable and prevents overheating—essential for the long-term reliability of Waterboxer engines.

This pump is supplied complete with the required O-ring and both gaskets, allowing for a straightforward installation without needing to source additional sealing parts. Using the correct offset-hole pump is critical; fitting the wrong version can lead to sealing issues, coolant leaks, or misalignment.

What this part does and how it works

Coolant enters the pump housing and is driven by the internal impeller through the engine’s coolant passages. Heat absorbed from the engine is then carried away to the radiator and heater system. A healthy water pump ensures consistent coolant flow, even temperature distribution, and protection against hot spots and head gasket stress—common concerns on ageing Waterboxer engines.

Fitment

• Vehicle: Type 25 / T3

• Years: 1983–1985

• Engine capacity: 1900cc Waterboxer

• Engine codes: DH, DF, EY, DG, SP, GW

• Inlet type: Offset bolt holes (early-style pump)

Supplied with

• Water pump assembly

• O-ring seal

• Both required gaskets

Fitting notes / related parts

• Always confirm your original pump has offset inlet holes before ordering

• Clean all mating surfaces thoroughly prior to installation

• Check coolant hoses, thermostat, and housing seals while access is available

• Refill with the correct coolant and bleed the system fully after fitting

Ideal for maintenance, cooling system overhauls, or replacing a noisy or leaking original pump, this unit restores reliable coolant circulation to early 1.9 Waterboxer Type 25 / T3 buses.