Parts for your 2005 Subaru Impreza-Thrust bearing

2005 Subaru Impreza thrust-bearing — what it is, where it’s used, and how to look after it

Based on Subaru technical sources — the 2005 Impreza Factory Service Manual (Engine and Clutch sections), Subaru’s STIS service information, and the Genuine Parts Catalogue for GD/GG Impreza — a thrust bearing is relevant on this model. Manual-transmission cars use a clutch release (thrust) bearing, and all EJ-series engines (e.g., EJ20/EJ25) use an integrated crankshaft thrust bearing in the No. 5 main bearing. Automatic models don’t have a clutch release bearing, but still have the engine’s thrust bearing. Typical Subaru release bearing part numbers include 30502AA120 (variant-dependent, confirm by VIN).

For owners of manual 2005 Imprezas, the thrust (release) bearing is the bit that lets the stationary clutch fork press on a spinning pressure plate without grinding. When the pedal’s pushed, the bearing carries the axial load and spins smoothly, so gear changes feel tidy and the clutch hardware doesn’t cop unnecessary wear. On some WRX variants with a pull-type clutch, the release bearing locks into the pressure plate, correct engagement is critical to avoid noise and poor pedal feel.

• Common signs it’s on the way out: a whirring, chirp, or squeal that appears with the clutch pedal depressed.
• Notchy engagement or a shudder under load.
• Pedal feel that’s gone rough or grabby.
• Noise that changes with pedal position rather than road speed.

There’s no fixed replacement interval — most are renewed with the clutch kit. As a rule of thumb, many last 120–200,000 km, but stop–start driving, towing, or hard launches will shorten that. During a clutch job, it’s smart practice to replace the release bearing, pressure plate, clutch disc and pilot bearing together, then inspect the fork, pivot/ball, clip springs and the input-shaft guide tube/snout. The bearing itself is sealed — don’t wash or pack it with grease. Instead, apply a light smear of high-temp moly grease to the guide tube and input splines only, keeping grease off the friction surfaces.

Hydraulic models benefit from fresh clutch fluid every couple of years, while cable models should have free play and cable condition checked. For WRX pull-type setups, ensure the release bearing’s retaining clip is properly engaged on refit. Always torque fasteners to the Factory Service Manual specs.

• Does a 2005 Subaru Impreza have a thrust bearing?
  Yes. Manuals have a clutch release (thrust) bearing, and all EJ engines have an integrated crankshaft thrust bearing. Automatics don’t use a clutch release bearing but still rely on the engine’s thrust bearing to control crank end float.
• What symptoms point to a failing thrust/release bearing?
  Noise with the clutch pedal depressed — a whirr, chirp or squeal — is the classic giveaway. You might also feel roughness through the pedal or notice notchy engagement. If the sound changes with pedal position more than with road speed, the release bearing is a prime suspect.
• Should the thrust bearing be greased or serviced?
  The release bearing is a sealed unit and isn’t serviceable. Replace it during a clutch job. Only the guide tube/snout and input splines get a very light, correct high-temp grease. Keeping the area clean and using quality parts goes a long way.