Skip to content
8–23 August: reduced summer staffing. Orders may take up to 5 extra working days to dispatch and emails up to 2 working days to answer. Thanks for your patience.
8–23 Aug: orders may ship up to 5 days later.

STC3691 - Alternator Pulley – Polyvee – 300TDi

- €22,20
€22,20
€22,20 - €22,20
€22,20
Aftermarket Part
Aftermarket: Quality alternative. This is a quality alternative, designed to fit and function like the original part, often at a more competitive price.
Alternator Pulley - Poly-V for the 300 Tdi 2.5-litre turbo diesel, the multi-groove pulley that drives the alternator from the auxiliary drive belt.

Mounted on the alternator shaft, the pulley transfers rotation from the ribbed auxiliary belt to spin the alternator rotor and generate charge. The poly-V (multi-groove) profile matches the ribbed belt for positive, slip-free drive.
Vehicle Model Land Rover Discovery 1 1989-1998 (L318)
Fitment Notes DISCOVERY 1 1989-1998 — 2.5L Tdi 300 Tdi, from VIN VA onwards
Alternative Codes
STC3691

In stock 2 units
0 · Gouda 2 · Drachten
Express delivery available

When will my order arrive?
  • Order before 15:00 (Mon–Fri): same-day dispatch for in-stock items.
  • UPS Express (order before 14:00): dispatched today, delivered tomorrow where available.
  • Netherlands / Belgium / Germany: 2–4 working days.
  • Other EU countries + UK: 4–8 working days.
  • Outside EU/UK: delivery times vary — contact us for an estimate.

Items may ship from multiple warehouses at no extra cost.

Job kits containing this part

This part is included in 0 job kit(s) below. Pick the kit that matches your vehicle and job, then add what you need.

Frequently asked questions

What is the STC3691 alternator pulley used for?
The STC3691 alternator pulley is the multi-groove poly-V pulley that drives the alternator on the 300Tdi engine. It mounts on the alternator shaft and takes drive from the ribbed auxiliary belt, spinning the rotor to generate charge. The poly-V profile matches the ribbed belt for positive, slip-free drive.
Which engine and model does this pulley fit?
This alternator pulley fits the Land Rover Discovery 1 with the 2.5-litre 300Tdi diesel engine, from VIN VA onwards. The 300Tdi uses a ribbed poly-V auxiliary belt, so confirm your engine is the 300Tdi and not the earlier 200Tdi before ordering. Use your VIN to verify the build.
Where does the alternator pulley sit in the drive system?
The alternator pulley sits on the nose of the alternator shaft and is turned by the ribbed auxiliary belt running off the crankshaft. On the 300Tdi it forms part of the poly-V auxiliary drive that typically also turns the water pump and other ancillaries, so belt condition affects charging.