Parts for your 2000 Nissan Serena-Drive belt tensioner

2000 Nissan Serena drive-belt tensioner — is it actually used?

Short answer: for most 2000 Nissan Serena models seen in Australia and New Zealand, a separate spring-loaded drive-belt tensioner isn’t used. The common 2000 C24 Serena with the SR20DE petrol engine runs individual accessory belts that are tensioned manually via the alternator, power steering pump brackets, and an A/C idler pulley, rather than a dedicated automatic tensioner assembly. This call is based on technical references including the Nissan Serena C24 Service Manual (Engine Mechanical and Maintenance sections), the Nissan FAST electronic parts catalogue, and major belt catalogues (Dayco and Gates) that list no automatic tensioner for the SR20DE in that model year but do list one for later QR20DE-equipped Serenas.

Why no separate tensioner? The SR20DE setup is a straightforward multi-belt layout. Belt tension is set by loosening the lock bolts on the accessory (or its idler), adjusting the belt with the factory adjuster screw or bracket travel, then re-tightening. The alternator, power steering pump, and A/C idler each take care of their own belt tension. It’s simple, rugged, and keeps parts count down — which is why there’s no standalone, spring-loaded drive-belt tensioner to replace on these early C24s.

What should owners and workshops do instead? Keep an eye on belt wear and tension as part of routine servicing. If there’s a cold-start squeal, dimming charge light at idle, heavy steering on turn, or A/C squeak with the compressor on, chances are a belt is loose or glazed. Inspect for cracking, fraying, glazing, or contamination with oil/coolant. Adjust tension using the factory procedure and recheck after a short run-in, as new belts can bed in and slacken slightly. Don’t over-tighten — that can chew out accessory bearings. If a belt shows age or damage, replace it rather than chasing endless adjustments.

• Service tip: check belt condition at each service (around every 10–15,000 km or 12 months) and adjust as needed. Replace belts when worn, noisy, or at the interval recommended in the service schedule.
• Engine variants note: some later C24 Serenas (e.g., QR20DE petrol, YD22 diesel) do use a serpentine belt with an automatic tensioner. If your Serena isn’t the SR20DE, confirm by engine code or VIN before ordering parts.

Popular questions

Does a 2000 Nissan Serena have a drive-belt tensioner?
Generally, no — the 2000 C24 with the SR20DE uses manually adjusted accessory belts, so there’s no separate spring-loaded tensioner assembly to replace. Later C24s with different engines (like the QR20DE) do have an automatic tensioner, so it pays to check the engine code.

How are the belts adjusted on an SR20DE Serena?
Each belt is adjusted at its accessory. Loosen the lock and pivot bolts, use the factory adjuster (or bracket travel) to set tension, then tighten everything back up. It’s a quick job with basic spanners, but follow the workshop spec so you don’t over-tighten and stress bearings.

When should the Serena’s accessory belts be replaced?
Inspect every service and replace if you see cracking, fraying, glazing, or if there’s persistent squeal after correct adjustment. Many owners swap belts around 60–100,000 km, sooner if belts have been contaminated by oil or coolant.