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Type 25 Alternator Belt (V Belt L=1100mm W=10mm) - 1986-92 - Waterboxer Engines

This alternator V-belt is the correct replacement for Volkswagen Type 25 / T3 buses fitted with 1900cc and 2100cc Waterboxer engines from August 1986 through July 1992. Manufactured to the original specification, it provides dependable drive to the alternator, ensuring consistent battery charging and stable electrical performance.

On Waterboxer engines, the alternator belt transfers drive from the crankshaft pulley to the alternator. Proper belt length and width are critical: an incorrect belt can slip under load (causing charging issues and squeal) or run too tight, leading to premature bearing wear. This 10mm x 1100mm belt matches the later Waterboxer pulley setup used from 08/86 onward, allowing correct tensioning and long service life.

How it works

The reinforced rubber V-belt grips the pulley faces and converts crankshaft rotation into alternator drive. Its construction resists heat, flex fatigue and stretch, maintaining steady output even under electrical load. Correct sizing helps keep the belt aligned, reduces noise, and protects alternator bearings.

Fitment notes

  • For alternator use only (not power steering)

  • Always check pulley condition and alignment before fitting

  • Recheck belt tension after initial running-in


Applications

  • VW Transporter T3 – 1.9 & 2.1 Waterboxer (08/1986–07/1992)


Technical Specifications

  • Width: 10mm

  • Length: 1100mm

  • Type: V-belt (alternator)


May also be required (sold separately)

  • Alternator pulley shims

  • Alternator mounting hardware

  • Additional accessory belts (where fitted)

This Part Fits: Type 25

Availability: Stock Item

Item Name: V-belt, 10x1100 mm

Description: V-Belt

Product Group: Engine

Group: Belt Drive

Unit of Measure: Each

Manufacturer: JOPEX

Dimensions:

Width: 110mm

Height: 470mm

Depth: 10mm

Volume: 517000mm3

Weight: 0.08kg

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