Type 25 Water Hose - Left Hand Manifold To Left Cylinder Head - 1980-85 - 1900cc Waterboxer

This replacement rubber water hose is designed for Type 25 buses fitted with 1900cc petrol Waterboxer engines produced from 1983 up to July 1985. The hose connects the left-hand inlet manifold to the left-hand cylinder head—passenger side on RHD models—and is formed to the correct OE shape for a precise, leak-free fit.

On early 1.9 Waterboxer engines, this hose is a key part of the coolant circuit between the inlet manifold and the cylinder head. It allows heated coolant to circulate correctly through the engine, supporting even temperature distribution and stable operation. Because it sits close to engine heat and is subject to pressure and vibration, original hoses often harden, crack, or swell over time, leading to coolant loss or intermittent leaks.

Manufactured from high-quality rubber to the original profile, this replacement restores correct routing, clearance, and sealing—ideal for maintenance, cooling system refreshes, or replacing aged originals.

What this hose does and how it works

Coolant flows between the cylinder head and the inlet manifold via this hose, helping regulate temperatures across the engine. A sound hose here is essential for proper cooling efficiency and for preventing air ingress or coolant seepage that can compromise thermostat operation and overall engine health.

Fitment

• Vehicle: Type 25

• Years: 1983 – July 1985

• Engine: 1900cc petrol Waterboxer

• Engine codes: DG, DF, EY

• Location (RHD): Left-hand manifold to left-hand cylinder head (Passenger side)

Fitting requirements (sold separately)

• 1 × N0164021 hose clip

• 1 × N0164041 hose clip

Fitting notes / related checks

• Replace hose clips to ensure even clamping and prevent leaks

• Inspect mating stubs on the manifold and head for corrosion or pitting

• Refill with the correct coolant and bleed the cooling system thoroughly after installation

A correctly formed, high-quality replacement hose that helps keep your early 1.9 Waterboxer Type 25 cooling system reliable and leak-free.