Parts for your 2000 Subaru Legacy-Drive belt pulley

2000 Subaru Legacy drive-belt pulley: what it does, and when to service it

Based on the Subaru Factory Service Manual for MY2000 Legacy/Outback (EJ-series engines) and major parts catalogues from Subaru, Gates and Dayco, the 2000 Subaru Legacy absolutely uses accessory drive-belt pulleys. The system includes the crankshaft (harmonic balancer) pulley and pulleys on the alternator, power steering pump and A/C compressor, supported by idler and tensioner pulleys. These components guide and drive the belts that run key accessories, so they’re very much relevant to this model.

On the 2000 Legacy, the drive-belt pulley’s job is straightforward: transfer the engine’s rotation from the crank pulley to essential accessories. Without healthy pulleys and belts, you’ll get squeals, poor charging, heavy steering and no cold air on a hot arvo. Some variants use two belts (one typically handling alternator/power steering and another for A/C), so there can be several pulleys involved. The crank pulley also doubles as a harmonic damper to smooth vibrations, which helps protect the engine and belts from harshness.

For servicing, a tidy rule is to inspect the pulleys every 12 months or 15,000 km, and any time a belt is replaced. Spin the idler and tensioner pulleys by hand, if there’s roughness, play, or a dry, graunchy sound, replace them. Check for wobble at idle, witness marks from belt mis-tracking, or rust dust from failing bearings. If the belt is glazing, fraying or cracking, fit a new belt and confirm the pulleys aren’t the root cause.

The crank pulley deserves special attention: if you notice wobble, rubber damper separation, or belt walk, address it promptly. A failing damper can chew through fresh belts and stress front-end accessories. When swapping belts, set tension correctly (or verify the automatic tensioner operates smoothly). Over-tight belts can take out bearings, too loose and you’ll get slip, squeal and poor alternator output.

Practical signs it’s time to act include chirping on cold start, squeal with A/C on, voltage drop or battery light flickers, heavier steering at low speed, or a belt that wanders on the pulley. Replacing suspect idler/tensioner pulleys alongside new belts is cost-effective, and it saves a second trip under the bonnet.

• Inspect: every 12 months/15,000 km
• Replace belts: typically 60,000–100,000 km, or if worn
• Replace pulleys: any noise, play, wobble, or damper separation

Popular questions

Do the 2000 Subaru Legacy models use one serpentine belt or multiple belts?
Most 2000 Legacy variants run two accessory belts: one for alternator/power steering and a separate belt for the A/C compressor, each with its own pulleys. That’s why you’ll often see more than one idler or tensioner in the layout.

This setup makes diagnosis simple: noises or slip with A/C on often point to the A/C belt or its pulleys, while charging or steering issues usually trace back to the other belt circuit.

What are the tell-tale signs a drive-belt pulley needs replacing?
Listen and look: a dry bearing growl, chirp or metallic tick at idle, pulley wobble, visible cracks or separation in the crank damper, or belt tracking off-centre. Any roughness when hand-spinning an idler or tensioner off the car is a red flag.

If a new belt squeals straight away, suspect pulley alignment or a tired tensioner rather than the belt itself.

Should pulleys be replaced when changing belts?
Not always, but it’s smart to assess them then. If the bearings are noisy, there’s play, or the surfaces are grooved or corroded, replace the pulleys with the belt. Many techs bundle fresh idlers/tensioners with new belts on older EJ engines to avoid repeat labour and come-backs.