Parts for your 2012 Subaru Legacy-Thrust bearing

2012 Subaru Legacy thrust-bearing — what it does and when to service it

Short answer: yes, a thrust-bearing is absolutely used on the 2012 Subaru Legacy (Liberty in AUS/NZ). Subaru’s factory service manuals for the 2012 Legacy/Outback list a crankshaft thrust bearing integrated into the main bearing set (the thrust faces are on the No. 5 main for the EJ25, and likewise specified for FB engines). The Subaru parts catalogue and transmission manuals also identify a clutch release (throw-out) bearing on manual-transmission models, which is a thrust-type bearing. So it’s a relevant component on this vehicle, both in the engine and (if manual) in the clutch assembly.

Purpose-wise, the engine’s thrust-bearing controls axial movement (end float) of the crankshaft. It cops the in-and-out loads from the clutch and accessory drives, keeping the crank running true so oil clearances stay happy and timing remains spot-on. In manual cars, the clutch release bearing is the bit that presses against the pressure plate’s diaphragm spring to disengage drive — it needs to spin smoothly and quietly each time the pedal’s pushed.

There’s no routine “maintenance” for the engine’s thrust-bearing beyond good servicing habits: quality engine oil, regular changes, and not abusing the clutch. Mechanics will check crank end play if the sump is off or the engine is out for other work. Replacement is a bottom-end job (engine out, main bearings out), typically done during an overhaul or if end float is found out of spec per the Subaru FSM.

On manual models, sensible practice is to renew the clutch release bearing whenever the clutch kit is replaced. It’s relatively cheap compared with the labour of pulling the gearbox. A light application of the correct high-temp grease on the bearing snout/guide and contact points (not the bearing face) during installation helps avoid squeaks and stickiness. If there’s a chirp, growl, or whir that changes when the clutch pedal is pressed, the release bearing is a prime suspect.

1. Watch for engine knock or fore–aft crank movement, metal in the oil, or odd clutch engagement behaviour — these can hint at thrust-bearing trouble.
2. On manuals, replace the release bearing with the clutch, inspect the fork and pivot, and check the slave/CSC operation.
3. If rebuilding the engine, measure and set end float to the Subaru FSM spec, using the correct thrust-bearing shells.

These points reflect Subaru’s factory service information and parts documentation for the 2012 Legacy/Outback drivetrains.

FAQs

Does a 2012 Subaru Legacy have a thrust-bearing?
Yes. The engine uses a thrust main bearing to control crankshaft end float, as specified in Subaru’s factory service manuals. Manual-transmission cars also use a clutch release (throw-out) bearing, which is a thrust-type bearing.

What are the signs of a worn thrust-bearing on a 2012 Legacy?
Engine thrust wear can show up as noticeable fore–aft crank movement, metallic debris in the oil, or odd clutch engagement effects. A noisy clutch release bearing often makes a whir, growl, or chirp that changes when the pedal is pressed.

When should the thrust-bearing be replaced?
The engine thrust-bearing is replaced during bottom-end work or an overhaul, or if crank end play is out of spec per the FSM. The clutch release bearing should be replaced any time the clutch kit is changed, or earlier if it’s noisy.