Parts for your 2008 Subaru Legacy-Thrust bearing

2008 Subaru Legacy thrust-bearing — what it does and when to replace it

Based on the Subaru Legacy/Liberty 2008 Factory Service Manual (BP/BL platform) — Engine (ME, crankshaft endplay and main bearings) and Clutch System (CL), as well as Subaru FAST electronic parts listings for BP/BL models, a thrust-bearing is absolutely relevant on this vehicle. The EJ-series engines use a thrust main bearing to control crankshaft endfloat, and 5-speed manual models use a clutch release thrust bearing (often just called the throw-out bearing). These sources also note variant differences between push- and pull-type clutches on certain trims.

For the 2008 Subaru Legacy with a manual gearbox, the thrust-bearing most owners talk about is the clutch release bearing. It sits on the transmission input shaft snout and pushes against the pressure plate’s diaphragm spring when the clutch pedal is pressed. Its whole job is to take axial load and spin smoothly under pressure, so gear changes stay clean and the pedal feel remains consistent.

Over time, that bearing can dry out or wear, especially with lots of stop–start driving. Tell-tale signs include a whirring or chirping noise when the clutch pedal is depressed (that fades when the pedal’s released), a notchy pedal, or vibration through the fork. If any of that shows up, it’s smart to plan a bearing replacement before it takes out the pressure plate or chews up the guide tube.

Best practice is to replace the thrust-bearing any time the clutch is out for a disc or cover swap. While the box is out, a good workshop will also:

• Inspect the fork, pivot/ball stud and guide tube for wear or grooves.
• Lightly lubricate the fork pivot, release fork contact points and gearbox input splines with a high-temp moly grease (keep grease off the friction surfaces and bearing face).
• Check the rear main seal and input shaft seal for weeps, fix now to avoid doing the job twice.
• Verify clutch type (push vs pull) and follow the FSM procedure for bearing fitment and release clip orientation.
• Tighten clutch cover bolts evenly in sequence to the specified torque in the Subaru manual.

For automatic models, there’s no external clutch release bearing, internal transmission thrust elements and the engine’s thrust main bearing exist but aren’t routine service items unless there are symptoms like abnormal endfloat or internal noises. Engine thrust main bearing inspection is part of rebuild-level work and is measured against factory endplay specs from the Subaru manual.

With the right parts and procedures, a fresh thrust-bearing keeps the 2008 Legacy shifting sweetly and helps protect the clutch investment for the long haul.

Popular questions

What noise does a failing thrust (throw-out) bearing make on a 2008 Legacy?

Typically a light whirring, chirp or grinding that appears when the clutch pedal is pressed and disappears when it’s released. If the noise changes with pedal travel or is worse when the car is hot, it’s a strong hint the release bearing is rough or dry. Catch it early to avoid collateral damage to the pressure plate fingers.

Should the thrust-bearing be replaced every time the clutch is done?

Yes. Because the gearbox is already out, replacing the release bearing with the clutch kit is low extra cost and high insurance. It’s also the right time to inspect the fork, pivot, guide tube and input splines, and to apply the correct lubricant at the specified points per the Subaru service manual.

Do automatic 2008 Legacy models have a thrust-bearing to service?

They don’t have a serviceable clutch release bearing. The transmission and engine contain internal thrust bearings/washers, but these aren’t routine service items. Any concerns there are addressed during transmission or engine overhaul following factory endplay and inspection procedures.