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Parts for your 2002 Subaru Forester-Drive belt tensioner
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2002 Subaru Forester drive-belt tensioner: what’s actually fitted and what to service
For a 2002 Subaru Forester, a conventional automatic drive-belt tensioner isn’t used on the accessory belts. Technical references that cover this model—namely the Subaru Factory Service Manual for MY2002 Forester (H4 SOHC sections for Alternator/Power Steering Belt and Air Conditioner Belt), Gates ABDS application data for EJ-series engines, Dayco Australia’s catalogue, and Subaru’s FAST parts listings—show two separate V‑ribbed accessory belts with manual adjustment via an idler/adjuster assembly, rather than a spring‑loaded serpentine tensioner.
Why no tensioner? The EJ-series engine in this Forester runs separate belts: one for the alternator/power steering and another for the A/C. Each uses a simple idler pulley and an adjusting bolt with lock hardware to set belt tension. It’s an old-school, reliable arrangement that predates Subaru’s later single serpentine-belt setups with automatic tensioners on FB-series engines. Important distinction: there is a hydraulic timing belt tensioner inside the timing cover, but that’s for the timing belt only—not the external accessory/drive belts.
- What this means for servicing: belt tension is set manually. Under the bonnet, the alternator/PS belt is tightened by loosening the lock nuts, turning the adjuster to achieve spec tension, then re‑locking. The A/C belt is similar, using its dedicated idler adjuster.
- Good practice: inspect belts at regular service intervals for cracking, glazing, fraying, or chirping on cold start. Re‑tension if there’s slip, and recheck after a few hundred kilometres on fresh belts as they can bed in.
- Listen and spin: while belts are off, spin the idler pulleys. Any roughness, wobble, or noise means the bearing’s tired—replace the pulley to avoid squeals or flicked belts later.
- Set tension to the factory spec using a belt gauge or a precise deflection method. Overtight belts can knock out alternator or idler bearings
