Parts for your 2012 Mazda Cx-9-Centre bearing

2012 Mazda CX-9 centre-bearing

Based on Mazda’s own technical literature—the CX-9 Workshop Manual (2007–2015) “Propeller Shaft” section and the Mazda Electronic Parts Catalogue—the 2012 Mazda CX-9 only uses a centre-bearing on All-Wheel Drive (AWD) models. Those AWD variants run a two-piece propeller shaft to the rear differential that’s supported mid-vehicle by a centre support bearing. Front-Wheel Drive (FWD) CX-9s don’t have a propeller shaft to the rear, so a centre-bearing isn’t fitted or required. Mazda service bulletins for CX-9 AWD also note driveline noise concerns that can trace back to wear in the centre support bearing, further confirming its use on AWD models.

For an AWD 2012 CX-9, the centre-bearing’s job is to hold the two-piece propeller shaft steady, keep it aligned, and tame vibration as torque heads to the rear wheels. The rubber carrier isolates noise and harshness, while the bearing itself lets the shaft spin smoothly at highway speeds. When that rubber perishes or the bearing wears, drivers may notice a low rumble, a droning vibration in the floor, or a thump on take-off.

It’s a sealed bearing, so there’s no greasing required, but it’s smart to have it checked at regular services—especially from around 80,000–120,000 km onward, or sooner if the vehicle tows, sees rough roads, or has had underbody impacts. Technicians will look for cracked rubber in the carrier, rusty dust around the bearing, looseness when the shaft is levered up and down, and any contact marks on nearby heat shields.

• Common signs it’s tired: droning or humming that changes with road speed, vibration under load, clunk when shifting from reverse to drive, visible splits in the rubber mount.
• Good practices: keep underbody shields intact, avoid soaking the mount in degreasers, and address exhaust or mount issues that can add extra stress to the bearing.

On many CX-9s Mazda supplies the centre support as part of the complete propeller shaft assembly, while aftermarket options may offer the bearing and carrier separately. Replacement involves removing the shaft, keeping the driveshaft halves in phase, and torquing flanges correctly to avoid new vibrations. Because the shaft is balanced as an assembly, marking orientation before removal and following the Workshop Manual procedure is key. If there’s vibration after a tyre balance and wheel alignment check, a driveline specialist can confirm whether the centre-bearing is the culprit or if a universal/CV joint or mount is to blame.

For FWD 2012 CX-9 owners: a centre-bearing isn’t used because there’s no rear propeller shaft—power stays at the front transaxle, eliminating the need for a mid-shaft support.

Popular questions

Does every 2012 Mazda CX-9 have a centre-bearing?
No. Only AWD models have a centre-bearing because they run a two-piece propeller shaft to the rear differential. FWD models don’t have a rear shaft, so there’s no centre support bearing fitted. This layout is confirmed by the CX-9 Workshop Manual’s propeller shaft section and Mazda’s parts catalogue listings.

Can the CX-9 centre-bearing be replaced on its own?
Mazda often supplies the propeller shaft as a complete assembly, which includes the centre support. Aftermarket bearing-and-carrier kits exist for AWD CX-9s, but correct installation and maintaining shaft balance and phasing are critical. Many workshops prefer replacing the full shaft to avoid vibration issues, while others will press in a quality bearing if the rest of the shaft is healthy.

How long does a CX-9 centre-bearing usually last?
Service life varies with use, but many see well over 150,000 km. Towing, rough roads, heat from nearby exhaust components, and fluid contamination can shorten life. Regular inspections from around 80,000–120,000 km can catch early rubber deterioration or bearing noise before it becomes a bigger driveline problem.