Parts for your 2010 Subaru Exiga-Drive belt pulley

2010 Subaru Exiga drive-belt pulley — purpose, care, and replacement

Based on the Subaru Exiga YA-series Factory Service Manual (2008–2012), the Subaru FAST parts catalogue, and Australian application data from Gates and Dayco, the 2010 Subaru Exiga uses accessory drive belts with multiple pulleys (crankshaft/harmonic balancer, alternator, A/C, power steering, and idler/tensioner). So a drive-belt pulley is absolutely fitted and relevant on this model.

On a 2010 Exiga, the drive-belt pulleys transfer the engine’s rotation to vital ancillaries. The crankshaft pulley (which also functions as a harmonic balancer with a rubber isolator) drives the alternator to keep the battery charged, the power steering pump for light steering, and the A/C compressor for cabin comfort. Most EJ20-equipped Exiga variants of this era run two belts off the crank pulley—one for alternator/power steering and another for A/C—with idler or adjuster pulleys to set tension and keep things tracking straight.

When these pulleys wear, bearings can get noisy, the pulley face can groove, or the crank balancer’s rubber can start to separate. Typical tell-tales include a brief squeal on cold start, chirping at idle, a wobbling crank pulley, battery warning lights, heavy steering, or A/C that struggles. Oil contamination from a cam or crank seal can also make belts slip and glaze, which quickly punishes pulley bearings.

During routine servicing, it’s smart to inspect all drive-belt pulleys. Under the bonnet, check belt condition and alignment, spin idler/tensioner pulleys by hand for roughness, and watch the crank pulley at idle for any runout or rubber delamination. Any pulley with play, noise, binding, or obvious misalignment should be replaced. At this age, many Exigas benefit from proactive replacement of noisy idler/tensioner pulleys and tired belts as a set.

Replacement is a straightforward spanner job for a competent home mechanic: disconnect the battery, note the belt routing, slacken the adjusters, remove the belt, then swap the suspect pulley. For the crank pulley or any high-torque fastener, follow the workshop specs and procedures precisely, and use quality OEM or reputable aftermarket parts. After refitting, tension the belts to the service manual guideline, run the engine, and re-check tension and tracking. Keeping oil leaks in check and inspecting every 10,000–15,000 km helps these pulleys live a long, quiet life. Given many 2010 cars are now well over a decade old, a close look at the crank balancer’s rubber and the idler bearings is well worth it.

• Symptoms to watch: squeal/chirp, visible wobble, charging or steering issues, bearing rumble.
• Best practice: replace worn pulleys with the belts, and fix any oil leaks that contaminate the drive.

Popular questions about 2010 Subaru Exiga drive-belt pulleys

Does the 2010 Exiga run one serpentine belt or separate belts?

Most 2010 Exiga EJ20 variants run two accessory belts driven by the crank pulley—one for alternator/power steering and a separate one for A/C. Under-bonnet routing diagrams or the VIN/engine code will confirm the exact setup for a given car.

This twin-belt layout means there are multiple associated pulleys, including idlers or adjusters, so inspection should cover each run.

What are the signs a drive-belt pulley is failing?

Tell-tales include chirping or squealing, a belt that walks to one edge, rumbling or roughness when an idler is spun by hand, visible pulley wobble, or the crank harmonic balancer’s rubber starting to crack or separate.

Owners might also notice secondary symptoms like battery lights, heavier steering, or A/C that slips under load.

Should the crankshaft pulley/harmonic balancer be replaced preventatively?

On an ageing EJ engine, the balancer’s rubber isolator can harden or delaminate. If there’s any wobble, noise, or visible cracking, replacement is wise to protect belts and accessories.

Given the 2010 Exiga’s age, many workshops recommend close inspection at every service and timely replacement if there’s any doubt.