Parts for your 2010 Subaru Exiga-Drive belt tensioner

2010 Subaru Exiga — Drive Belt Tensioner

Based on Subaru’s YA-series technical literature and parts data, whether a drive belt tensioner is used on a 2010 Subaru Exiga depends on the engine. Subaru’s Exiga (YA) Service Manual and the Subaru FAST electronic parts catalogue show the turbocharged EJ20 models (often badged 2.0GT) run a single serpentine accessory belt with a spring-loaded automatic drive-belt tensioner. In contrast, naturally aspirated EJ20 Exiga variants use two V-ribbed accessory belts with manual adjustment at the alternator/power-steering bracket and an idler for the A/C, so there’s no separate automatic tensioner on those NA cars. This split is echoed in Australian and New Zealand aftermarket catalogues (Gates/Dayco), which list an automatic tensioner for the turbo Exiga only, and none for the NA version.

For NA 2010 Exiga models, a standalone drive-belt tensioner isn’t used because belt tension is set with mechanical adjusters on the alternator and an A/C idler. That layout keeps costs down and works fine at lower accessory loads, but it does rely on correct manual adjustment during servicing.

On turbocharged 2010 Exiga models equipped with a drive-belt tensioner, the unit’s job is to keep the serpentine belt at the right tension as it spins the alternator, A/C compressor and power steering. The spring-loaded arm takes up slack as the belt wears and as loads change, so accessories run quietly and efficiently without constant manual tweaks. It also helps reduce belt slip on damp mornings or when the A/C kicks in, and keeps the belt tracking straight to protect pulleys and bearings.

As part of regular servicing, the tensioner deserves a look under the bonnet. A quick visual check for arm wobble, misalignment, or a bouncing belt at idle is worthwhile. Any chirps, squeals, rattles or a grinding pulley are red flags. On higher-kilometre cars, a tired spring can let the belt flutter or glaze, and that’s often when a new belt plus a new tensioner is the tidy fix. Many techs in Aus and NZ will replace the tensioner preventatively when fitting a fresh serpentine belt somewhere around the 100–150,000 km mark or at 7–10 years, especially if the old belt showed uneven wear.

Replacement is straightforward workshop fare: support the arm, relieve the spring, slip off the belt, and swap the unit, checking the pulley spins freely and the arm pivots smoothly. After refitting, run the engine and watch the belt track. If the belt still wanders or chatters, look for a bent bracket or a failing accessory pulley. Keeping the tensioner in good nick helps the Exiga’s charging, cooling and steering systems stay happy, and saves belts from an early exit.

• Applicable engines with automatic tensioner: 2010 Exiga EJ20 Turbo (serpentine belt system).
• Not applicable: 2010 Exiga EJ20 Naturally Aspirated (manual belt adjusters, no automatic tensioner).
• Technical references: Subaru Exiga (YA) Service Manual – Mechanical H4 sections (NA vs Turbo belt layouts), Subaru FAST EPC – YA-series accessory drive diagrams, AU/NZ Gates and Dayco catalogues indicating tensioner fitment on turbo only.

Popular questions

How can someone tell if their 2010 Exiga actually has a drive-belt tensioner?
Open the bonnet and look at the front of the engine. Turbo models will show one long serpentine belt and a spring-loaded arm with a pulley (the tensioner). NA models have two shorter belts and no spring-loaded arm, tension is set by adjuster bolts on the alternator/power steering and an A/C idler.

What symptoms point to a failing tensioner on a turbo Exiga?
Common signs include belt squeal on start-up, rattling from the tensioner pulley, visible belt flutter, or accessories misbehaving (intermittent charging or heavy steering). A glazed or frayed belt can also hint that the tensioner spring is weak or the pulley bearing is rough.

Should the tensioner be replaced whenever the serpentine belt is changed?
Not always, but it’s smart to assess both together. If the car’s at higher kilometres or the old belt shows uneven wear, many workshops will fit a new tensioner with the new belt to avoid coming back to the same area twice. If the pulley spins smoothly and the arm moves firmly without play, it can often stay in service.