G3,G4 Alternator Belt Tensioner

This high-quality alternator belt tensioner is a direct replacement for the factory tensioner used on a wide range of VW 1.4 and 1.6 petrol engines. The belt tensioner ensures the auxiliary (alternator) belt maintains the correct tension as the engine runs, preventing belt slip, squeal, charging issues, or premature wear to the alternator pulley and belt itself.

Over time, original tensioners can wear internally, develop noisy bearings, or lose spring strength, leading to poor belt tracking or loss of charging output. Replacing a tired tensioner restores stable belt tension, smooth auxiliary drive operation, and reliable alternator performance—especially noticeable on vehicles using electrical loads such as air-conditioning, heated screens, or aftermarket audio systems.

This unit features a precision bearing and OE-spec pulley profile, ensuring quiet running and long service life. It installs directly in place of the original unit with no modifications required.

Technical Specification

• Width: 26mm

• Outer Diameter: 70mm

Confirmed Fitment

VW Golf Mk3 (1995–1998)

(Fits models from chassis 1H-S-120 001 >>)
Engines:

• 1.4 – ABD, AEX

• 1.6 – AEA, ABU, AEE

VW Golf Mk4 / Bora (1998–2004)

1.4 Engines:

• AXP, BCA, APE, AHW

1.6 Engines:

• AKQ, ATN, AUS, AZD, AHW, BCB, BAD

VW Polo (Various Models)

1.0 / 1.05 Engines:

• AEV, AER, ALL

1.3 Engines:

• ADX

1.4 Engines:

• AEX, AFH, AKV, ANX, APQ, AFK

1.6 Engines:

• AEA, AEE, AHS, AJV

Suitable for a broad range of VW small-block petrol engines, this tensioner is ideal when renewing the auxiliary belt or resolving belt noise and charging faults.