Parts for your 2017 Subaru Legacy-Thrust bearing

2017 Subaru Legacy thrust bearing — what it is, and when it matters

Technical sources including the Subaru Factory Service Manual for the 2015–2019 Legacy/Outback (FB25 and EZ36 engine sections) and Subaru’s STIS service documentation show that the 2017 Subaru Legacy’s engine uses an integrated crankshaft thrust bearing as part of the main bearing set to control end float. Because 2017 Legacy models are equipped with Lineartronic CVT rather than a manual gearbox, there’s no clutch release (throwout) bearing to service. So yes, a thrust bearing is fitted — but it’s in the engine, not the clutch.

On the 2017 Subaru Legacy, the thrust bearing lives inside the engine as part of the crankshaft main bearings. Its job is to keep the crank from walking fore and aft when axial loads try to shove it around — things like torque converter/flexplate loads, accessory belt pull, and normal combustion forces. Those flanged bearing surfaces maintain crank endplay within spec so oil clearances, timing alignment, and sensor readings stay happy. In plain speak: it keeps the crank where it belongs.

It isn’t a routine service item. The thrust bearing is lubricated by engine oil and is designed to last the life of the engine when oil quality and levels are kept on point. Good servicing habits matter here: stick to the recommended oil grade, change intervals, and use quality filters. Letting oil run low or thin can accelerate wear, and any misstep during transmission removal/installation (like not fully seating the torque converter before bolting up the flexplate) can load the thrust bearing and wipe it out fast.

When it does need attention, it’s not a driveway job. Replacement means removing the engine, splitting the case halves, measuring the crank, and installing a matched main bearing set. A workshop will confirm endplay with a dial indicator against the crank pulley or flexplate, check for metallic debris in the oil, and inspect the flexplate and converter fitment. If there’s axial knock, erratic idle when shifting from Park to Drive, a metallic rub from the bellhousing area, or unexplained crank position sensor faults, a proper diagnosis is due.

Tips to keep the Legacy’s thrust bearing out of trouble:

• Keep engine oil fresh and at the correct level.
• If the CVT is removed, ensure the torque converter is correctly seated before refit.
• Address any flexplate cracks or misalignment promptly.
• Use factory procedures and specs from the Subaru service manual.

With those boxes ticked, the engine’s thrust bearing should cruise along for many kilometres without complaint.

Popular questions

Does a 2017 Subaru Legacy have a throwout (clutch) bearing?
No. The 2017 Legacy runs a Lineartronic CVT, so there’s no conventional clutch or throwout bearing. The only “thrust bearing” owners will hear about is the crankshaft thrust bearing inside the engine, which controls endplay.

What are the signs of a worn crankshaft thrust bearing on a 2017 Legacy?
Look for axial knocking noises near the bellhousing, fluctuating idle or stalling when selecting Drive, metal glints in the engine oil, or visible fore–aft movement of the crank pulley. A workshop will confirm by measuring endplay and checking for flexplate or torque converter issues.

Is the thrust bearing a regular service item?
No. It’s internal to the engine and only addressed during major engine repairs. The best “maintenance” is simply correct oil servicing and proper transmission installation practices to avoid axial overloads.