Parts for your 2010 Subaru Tribeca-Drive belt pulley

2010 Subaru Tribeca Drive-Belt Pulley

A drive-belt pulley is absolutely relevant on the 2010 Subaru Tribeca. Technical sources including the Subaru Service Manual available via Subaru’s Technical Information System (STIS), plus Gates and Dayco application catalogues, specify a serpentine accessory drive on the EZ36 3.6‑litre flat‑six with multiple pulleys: the crankshaft (harmonic balancer) pulley, alternator pulley, A/C compressor pulley, an automatic tensioner pulley and one or more idler pulleys. Subaru parts catalogues for the 2010 Tribeca also list these pulleys as serviceable items, confirming they’re fitted from factory.

On this model, the drive-belt pulleys transfer crankshaft rotation to essential accessories. The crank pulley (harmonic balancer) drives the belt, while the alternator, A/C and power steering pump pulleys do the work. The tensioner and idler pulleys guide the belt and keep tension spot on, helping the belt run quiet and true. The EZ36’s water pump is chain‑driven internally, so the external serpentine belt focuses on charging, steering assist and air‑con.

When the pulleys wear, the Tribeca can cop a few annoyances and risks. Common warning signs include:

• Chirping, squealing or rumbling at idle that changes with revs
• Visible wobble of a pulley or the belt “walking” on a rib
• Frayed or glazed belt edges and black dust around the front of the engine
• Battery or steering warning, dim lights, heavy steering, or weak A/C at idle

Good practice is to inspect the belt and pulleys at each service (about every 10,000–15,000 km), and more closely by 100,000–150,000 km. Spin idler and tensioner pulleys by hand (engine off) and feel for roughness or play