T4 Timing Belt Tensioner - 1991-95 - 2.5 Petrol (AAF,ACU)

Ensure dependable timing belt operation on your VW T4 Transporter 2.5 petrol engine with this premium replacement timing belt tensioner pulley. Designed for accurate fitment and long service life, this pulley plays a critical role in maintaining correct belt tension, protecting vital engine components, and ensuring smooth, reliable running.

Manufactured to precise dimensions, it is suitable for specific AAF and ACU engine applications, as detailed below.

What this part does

The timing belt tensioner pulley maintains the correct tension on the timing (cam) belt as the engine runs. Proper tension is essential to keep the camshaft and crankshaft synchronised. A worn or noisy pulley can cause belt vibration, uneven wear, or even belt failure—potentially leading to serious engine damage.

How it works

As the timing belt rotates, the tensioner pulley applies consistent pressure to the belt, compensating for belt stretch and thermal expansion. The pulley’s internal bearing allows smooth, low-friction rotation, keeping belt movement stable and accurately guided around the cam and crank sprockets.

Key specifications

• Application: Timing belt tensioner pulley

• Outer diameter: 63mm

• Width: 27mm

• Quality: Premium replacement

• Function: Maintains correct timing belt tension

Engine compatibility & fitment

Designed for Volkswagen T4 Transporter 2.5 petrol engines with the following specifications:

• AAF – 2.5 Petrol

  • Production: 10/1991 – 07/1995

  • Chassis numbers: 70-N-014 001 onwards

• ACU – 2.5 Petrol

  • Production: 10/1991 – 12/1994

  • Chassis numbers: 70-N-014 001 onwards

Fitting notes

• Always replace the tensioner pulley during a timing belt service

• Inspect the timing belt, idler pulleys, and water pump at the same time

• Correct belt tension and torque settings are essential for safe operation

This timing belt tensioner pulley is a vital maintenance component, helping to ensure long-term reliability and peace of mind for your T4 2.5 petrol Transporter, whether used daily or for longer journeys.