Parts for your 2009 Subaru Tribeca-Drive belt tensioner

2009 Subaru Tribeca Drive Belt Tensioner — What It Does and When to Replace It

Referencing factory and aftermarket technical sources — including the Subaru service manual for the EZ36 engine, and application data from common catalogue publishers like Gates and Dayco — the 2009 Subaru Tribeca is equipped with an automatic drive belt tensioner for the main accessory (serpentine) belt. On this model, the air-conditioning belt is a separate stretch-fit belt that does not use a tensioner, but the primary belt that drives the alternator and power steering relies on a spring-loaded tensioner assembly.

On a 2009 Tribeca, the drive belt tensioner keeps the main serpentine belt at the right tension as it turns key accessories under the bonnet. It automatically takes up slack as the belt wears and counters belt flutter at higher revs. That steady tension means quieter running, better battery charging, consistent power steering assistance, and less chance of the belt glazing or slipping on a wet morning.

As part of routine servicing, it’s smart to give the tensioner a once-over whenever the accessory belt is inspected or replaced. A good technician will spin the pulley to feel for roughness, check the arm for smooth travel, watch for signs of misalignment, and look for any hydraulic damping leaks if equipped. If the belt’s being swapped at major intervals — many shops in Australia and New Zealand aim for around 100,000–150,000 kilometres depending on condition and climate — it’s common sense to consider a new tensioner and idler pulley at the same time. It saves a second trip back under the car later.

Tell-tale signs the tensioner’s had its day include:

• Chirping or squealing on cold start or when accessories load up
• Belt fraying, glazing, or edge wear from poor tracking
• Visible tensioner wobble, weak spring force, or a rattly pulley bearing
• Intermittent battery light or heavy steering at idle due to belt slip

Replacement is straightforward with the right tools: relieve the spring tension, remove the belt, unbolt the old unit, then refit and route the new belt per the factory diagram. The separate A/C stretch belt needs the proper installation tool, forcing it on with screwdrivers risks damage. Always follow OEM torque specs and belt routing, and recheck after a short test drive. Fitting a quality OE or reputable aftermarket tensioner will keep the Tribeca happy on long Kiwi and Aussie road trips, from city commutes to coastal getaways.

Popular questions

Does the 2009 Subaru Tribeca actually have a drive belt tensioner?

Yes. The main serpentine belt that runs the alternator and power steering uses an automatic spring-loaded tensioner. Only the air-conditioning belt is a separate stretch-fit design without a tensioner on this model.

How often should the drive belt tensioner be replaced on a 2009 Tribeca?

There’s no strict time limit, but it should be inspected at every service and strongly considered for replacement when the main belt is due — commonly around 100,000–150,000 kilometres, or earlier if there’s noise, rough pulley bearings, weak spring action, or poor belt tracking.

Is it safe to keep driving if the tensioner is noisy?

Not recommended. A failing tensioner can let the belt slip or come off, which can quickly lead to loss of charging and heavy steering. If it’s squeaking or wobbling, book it in promptly before a minor nuisance turns into a roadside headache.