Parts for your 2008 Subaru Tribeca-Drive belt tensioner

2008 Subaru Tribeca Drive-Belt Tensioner

Based on technical references, the 2008 Subaru Tribeca is fitted with an automatic serpentine drive‑belt tensioner. The Subaru factory service manual for the 2008 Tribeca (ME/H6 belt drive section), Subaru’s FAST electronic parts catalogue, and major aftermarket catalogues from Gates and Dayco all list a drive‑belt tensioner assembly for the EZ36 (3.6L) and late EZ30 (3.0L) H6 engines. Note this is for the accessory/serpentine belt, the Tribeca’s camshafts are driven by a timing chain, not a timing belt.

On this model, the drive‑belt tensioner keeps the serpentine belt at the right tension so the alternator, power steering pump and air‑con compressor all run smoothly without slip or noise. It’s a spring‑loaded unit that automatically compensates for belt stretch and load changes, so the driver doesn’t need to fiddle with manual adjustments under the bonnet.

As part of regular servicing, it’s smart to have the belt and tensioner checked every service or at least every 10,000–15,000 km. Listen for squeaks or chirps on cold starts, watch for belt flutter, and inspect the tensioner pulley for wobble, roughness or signs of the arm sitting off-centre. Oil or coolant leaks onto the belt can also upset tension and should be sorted straight away.

Replacement is typically considered around 120,000–160,000 km, or sooner if there’s bearing noise, visible misalignment, a weak spring, or cracking in the pulley. Many workshops replace the tensioner when fitting a new serpentine belt to avoid coming back for the same area twice. Always use quality OEM or reputable aftermarket parts and replace any glazed or cracked belt at the same time. After fitting, check belt routing, ensure the tensioner arm moves smoothly through its range, and torque fasteners to spec from the service manual.

A few quick tips for an easier job: relieve tension with the correct spanner on the tensioner hex, rotate in the specified direction, and take a quick photo of belt routing before removal. If the pulley feels gritty when spun by hand, or there’s side‑to‑side play, it’s time for a new unit. Keeping the drive‑belt system healthy helps the Tribeca charge properly, steer lightly, and keep the cabin cool—no dramas on long Kiwi or Aussie road trips.

• Common symptoms of a failing tensioner: belt squeal, intermittent battery light, power steering heaviness at idle, visible belt shake, or a ticking/grinding pulley noise.
• Good practice: inspect every service, replace the belt and tensioner together if wear is evident.

Popular questions

Does the 2008 Tribeca have a timing belt tensioner?
No. The 2008 Tribeca’s H6 uses timing chains, so there’s no timing belt tensioner to service. The drive‑belt tensioner discussed here manages the external serpentine belt that runs the alternator, A/C and power steering.

How often should the drive‑belt tensioner be replaced?
There’s no fixed mileage, but many techs see reliable service to around 120,000–160,000 km. Inspect at every service, replace if the pulley is noisy, the spring is weak, there’s misalignment, or when fitting a new belt on a high‑km vehicle.

What are the signs my Tribeca’s tensioner is on the way out?
Cold‑start squeals, belt chirps, a flickering charge light, heavier steering at idle, or a grinding/whirring from the pulley are common tells. Under the bonnet, look for belt flutter, a tensioner arm that’s hunting, or any pulley wobble.