Parts for your 2012 Mazda 6-Centre bearing

2012 Mazda 6 centre-bearing: is it fitted, and does it need servicing?

For the 2012 Mazda 6, a centre-bearing isn’t part of the driveline. Referencing the Mazda 6 Workshop Manual for GH (2008–2012) and early GJ (2012-on) models under Driveline/Axle, the layout is front‑wheel drive with a transverse transaxle and two front CV shafts. The Mazda Electronic Parts Catalogue for these models lists no propeller shaft or carrier/centre support bearing. In driveline design texts, centre-bearings are used to support long, two‑piece prop shafts in rear‑ or all‑wheel drive vehicles—hardware the 2012 Mazda 6 simply doesn’t have.

That’s why a centre-bearing isn’t used on this model: there’s no rear differential and no long tailshaft to support. Power goes straight from the transaxle to the front wheels via the left and right driveshafts, so there’s nothing mid‑car that needs a carrier bearing. The only Mazda 6 variant known to use a prop shaft and carrier bearing was the earlier AWD Mazdaspeed6/MPS (mid‑2000s), not the 2012 front‑drive GH/GJ cars.

Owners sometimes ask about a “middle” bearing because the right‑hand (passenger‑side) driveshaft on some FWD Mazdas uses an intermediate shaft with its own support bearing bolted to the engine block. That part is an intermediate/axle support bearing, not a centre-bearing. Different job, different location, and different symptoms.

If a 2012 Mazda 6 shows noises or vibrations often blamed on a centre-bearing—think droning at highway speeds, thumps on take‑off, or shudder under load—the likely culprits are elsewhere. Sensible checks include:

• Front wheel bearings for play or humming with road speed
• CV joints and boots for clicking, split rubber, or grease spray
• Right‑hand intermediate shaft support bearing (if fitted) for roughness or movement
• Engine and transmission mounts for excess movement on take‑off
• Tyres, balance, and alignment for cupping or out‑of‑round issues

Technical sources referenced: Mazda 6 GH/GJ Workshop Manual (Driveline/Axle sections), Mazda Electronic Parts Catalogue (absence of propeller shaft/centre support bearing for 2012 Mazda 6), and standard driveline engineering references noting centre-bearings are specific to two‑piece prop shafts in RWD/AWD layouts. Based on these, a centre-bearing isn’t relevant to servicing a 2012 Mazda 6.

Popular questions

Does a 2012 Mazda 6 have a centre-bearing?
No. The 2012 Mazda 6 is front‑wheel drive and doesn’t use a prop shaft, so there’s no centre-bearing to inspect or replace. Any mid‑car vibration should be traced to front wheel bearings, CVs, mounts, tyres, or the intermediate shaft support bearing on the passenger side (if equipped).

What’s the bearing halfway along the passenger‑side shaft on some 2012 Mazda 6 models?
That’s an intermediate (axle) shaft support bearing. It supports the longer right‑hand driveshaft to reduce torque steer and vibration. It’s mounted to the engine block and is separate from the hub wheel bearing and CV joints.

What should be checked if it feels like a failed centre-bearing on a 2012 Mazda 6?
Since there’s no centre-bearing, check the front wheel bearings for humming, CV joints for clicking, the intermediate shaft support bearing for roughness, engine/gearbox mounts for excess movement, and tyre condition/balance. These items usually resolve driveline shakes on this model.