Parts for your 2013 Subaru Tribeca-Drive belt pulley

2013 Subaru Tribeca drive-belt pulley

Technical sources confirm the 2013 Subaru Tribeca (EZ36D 3.6L H6) absolutely uses drive-belt pulleys. The Subaru factory service manual for the 2013 MY Tribeca details a single serpentine accessory belt with an automatic tensioner and multiple pulleys, while Subaru’s parts catalogue lists the crankshaft (harmonic balancer) pulley, idler pulleys and the belt tensioner assembly. Dayco and Gates application data also show the same belt routing for the alternator, A/C compressor and power steering pump.

On the Tribeca, the drive-belt pulley system transfers rotation from the crankshaft to run the alternator, power steering pump and aircon compressor. The crank pulley (harmonic balancer) damps torsional vibration, and the idler and tensioner pulleys keep the belt routed and tensioned just right so everything under the bonnet spins smoothly. Note for the tech-minded: on the EZ36D, the water pump is chain-driven internally, not by the accessory belt.

As part of servicing, it’s smart to give the belt and pulleys a look at every regular service. In Aussie and NZ conditions, many workshops check them every 10,000–15,000 kilometres. They’ll listen for bearing rumble, feel for play or wobble, and look for belt cracks, glazing or frayed ribs. A chirp or squeal on start-up, a rumbling that rises with revs, a mis-tracking belt or a flickering battery light are common tells a pulley or tensioner is on the way out.

Plenty of owners choose to replace the belt, tensioner and idler pulleys as a set somewhere around 100,000–150,000 kilometres, or earlier if there’s any noise or belt wear. Using OE-quality or reputable aftermarket components keeps the EZ36 happy. If the harmonic balancer shows rubber deterioration, wobble or wobbling at idle, swap it—don’t ignore it.

• Keep oil and coolant off the belt—fix leaks first, belt dressings aren’t a fix.
• When replacing, note the belt routing, use the correct tool to unload the tensioner, and spin-check every pulley for noise or roughness.
• Re-torque fasteners to the Subaru spec and make sure the belt ribs sit perfectly in the pulley grooves.
• After start-up, watch the belt track and listen—no squeaks, no wobble.

Done right, the Tribeca’s drive-belt pulleys clock up big kilometres with minimal fuss, keeping charging, steering assist and aircon spot on.

Popular questions

How can someone tell if a 2013 Tribeca drive-belt pulley or tensioner is failing?
They’ll usually hear it first: a cold-start chirp, constant squeal, or a gravelly rumble that follows engine revs. Visuals help too—belt rib fraying, shiny glazing, dusting, or the belt walking off-centre. With the engine off, a pulley that feels gritty, wobbles, or has side play is due for replacement. If the harmonic balancer wobbles at idle, that’s a red flag for the crank pulley.

Do special tools be needed to replace the belt or pulleys on the EZ36 Tribeca?
For the serpentine belt and idler/tensioner pulleys, a serpentine belt tool or long-handled 14 mm/15 mm spanner typically does the trick, plus a torque wrench. If changing the crank pulley (harmonic balancer), a holding tool may be required. Allow clearance around the cooling fans and shrouds and always follow the Subaru torque specs from the factory manual.

Should the pulleys and tensioner be replaced when fitting a new belt?
Best practice is yes—replace the belt, idlers and tensioner together if there’s any noise or age on the parts. It saves labour down the track and keeps belt tracking spot-on. If everything spins silky smooth and the bearings are quiet, they can be left in service, but any roughness or play means it’s time to bundle them with the new belt.