Parts for your 2009 Subaru Tribeca-Drive belt pulley

2009 Subaru Tribeca drive-belt pulley: what it does and how to look after it

Yes, the 2009 Subaru Tribeca absolutely uses a drive-belt pulley system. Technical references including the Subaru factory service manual for the EZ36D engine (Drive Belt section), Subaru parts catalogues for the 3.6R/Tribeca, and Dayco/Gates application guides all specify a single serpentine belt running over the crankshaft pulley (harmonic balancer), alternator, power steering pump, and A/C compressor, with an automatic tensioner and idler pulleys. The water pump is chain-driven internally, so it isn’t on the accessory belt.

On this Tribeca, the drive-belt pulleys transfer and guide the engine’s rotation from the crankshaft to the accessories. The crank pulley provides the drive, the alternator and A/C pulleys are driven components, and the tensioner and idler pulleys maintain belt wrap and alignment so everything spins smoothly. A healthy pulley set keeps charging strong, steering light, and cabin air cold.

For servicing, a quick look under the bonnet at each service interval is smart. In Aussie and Kiwi conditions—heat, dust, and the odd salty breeze—inspect the belt for cracking or glazing, and spin each pulley by hand (engine off) to feel for roughness. Many workshops replace the serpentine belt around 90,000–105,000 km or 6 years (whichever comes first), following common belt manufacturer guidance, pulleys and the automatic tensioner are replaced on condition—any noise, wobble, binding, or obvious play means it’s time.

• Watch for chirps or squeals on cold start, a whining/grinding from the front of the engine, wobbling pulley faces, frayed belt edges, black rubber dust, heavy steering, dim charge light, or weak A/C at idle.

When replacing a drive-belt pulley, use an OE-quality part and check belt alignment across all ribs. It’s good practice to change a noisy idler and the tensioner together, then fit a fresh belt. Avoid prying on the harmonic balancer, if its rubber damper shows cracks or the pulley wobbles, replace it. Refit hardware to the service manual torque, rotate the engine by hand one full turn to confirm tracking, then start and listen—no chirps, no flits of rubber dust. Recheck belt tension and tracking after a few hundred kilometres.

Keeping the Tribeca’s drive-belt pulleys in top nick is simple, inexpensive, and saves hassles from flat batteries, heavy steering, or a hot cabin on a scorcher of a day.

Popular questions about 2009 Subaru Tribeca drive-belt pulley

Does the 2009 Tribeca have a timing belt, and is the water pump on the drive belt?
The 3.6-litre EZ36D uses timing chains, not a timing belt. Its water pump is chain-driven inside the timing case, so it’s not powered by the external serpentine drive-belt. The drive-belt pulleys handle the alternator, power steering pump, and A/C compressor, plus idler and tensioner duties.

How often should the drive-belt or pulleys be replaced?
Inspect the belt and pulleys at every service. Many techs replace the belt around 90,000–105,000 km or 6 years. Pulleys and the automatic tensioner are replaced when noisy, rough, loose, or misaligned. If one idler fails, it’s common to renew the set and the belt together for reliability.

What noises point to a bad pulley versus a worn belt?
A high-pitched chirp that changes with moisture can be a glazed belt, a dry bearing growl, rumble, or rhythmic grind is more pulley-like. With the engine off, spin each pulley—any roughness or play means it’s due. Persistent wobble at idle can indicate a failing pulley or harmonic balancer.