Parts for your 2014 Mazda 3-Centre bearing

2014 Mazda 3 centre-bearing — what’s actually on the car

After checking the technical literature, a traditional driveshaft centre-bearing (centre support bearing) is not used on the 2014 Mazda 3 (BM/BN). Mazda’s BM/BN platform is front‑wheel drive with a transaxle and front drive shafts, so there’s no long, two‑piece propeller shaft running to a rear differential that would require a centre-bearing.

In driveline terms, a “centre-bearing” supports the middle of a split propeller shaft on rear‑wheel drive or AWD vehicles to control run‑out and NVH. Because the 2014 Mazda 3 doesn’t have that prop shaft architecture, there’s simply nowhere for a centre-bearing to live. Instead, many variants use a right‑hand intermediate (jack) shaft to equalise left/right axle lengths, that assembly may include a carrier/support bearing bolted to the engine block. Some catalogues loosely (and confusingly) call that a “centre bearing”, but it’s not the same part or job as a prop‑shaft centre support bearing.

Why Mazda didn’t use a centre-bearing on this model comes down to packaging, weight, efficiency and cost. The FWD transaxle keeps all the torque transmission up front with two short CV axles, which reduces rotating mass and helps fuel economy and NVH without the complexity of a split prop shaft.

Chasing a rumble or vibration that someone’s blamed on a “centre-bearing”? On a 2014 Mazda 3 it’s more likely to be one of these:

• Front wheel bearings or tyre cupping/uneven wear
• Outer/inner CV joints, damaged boots, or imbalance in the shafts
• Right‑hand intermediate shaft carrier bearing (if fitted) starting to growl
• Engine/transmission mounts allowing excessive movement under load
• Out‑of‑round tyres or bent wheels

If the vehicle is fitted with the RH intermediate shaft carrier bearing and it’s noisy, the remedy is different to a prop‑shaft centre-bearing. The bearing is pressed onto the intermediate shaft and supported by a bracket, service usually involves removing the shaft, pressing off the old bearing, pressing on a quality replacement (or swapping the complete shaft assembly), and torquing the bracket fasteners to spec. A wheel alignment isn’t required for this job, but correct driveshaft seating and seal inspection matter to avoid leaks or vibration.

Technical sources referenced:

• Mazda 3 (BM/BN) Workshop Manual — Driveline/Axle: Front Drive Shaft and General Information (FWD layout, no propeller shaft)
• Mazda Parts Catalogue (BM/BN) — Front drive shaft diagrams showing RH intermediate shaft with support bearing on applicable variants
• Driveline engineering texts describing centre support bearings as components of two‑piece propeller shafts on RWD/AWD vehicles

Bottom line: a catalogue entry for a “2014 Mazda 3 centre-bearing” usually points to a mislabelled intermediate shaft carrier bearing. For a genuine centre-bearing on a prop shaft, this model simply doesn’t use one.

Popular questions about a 2014 Mazda 3 centre-bearing

Does a 2014 Mazda 3 have a centre-bearing?
No. The BM/BN Mazda 3 is front‑wheel drive and doesn’t run a two‑piece propeller shaft, so there’s no traditional centre-bearing. Some variants have a right‑hand intermediate shaft with a carrier bearing, which is a different component and job.

What’s that humming at 60–80 km/h — could it be a centre-bearing?
On this car it’s more likely a front wheel bearing, tyre issue, or a CV joint. If fitted, the RH intermediate shaft carrier bearing can also hum when worn. A road test with gentle steering inputs, plus tyre rotation and hub play checks, will help pinpoint the culprit.

How is the intermediate shaft carrier bearing serviced on a Mazda 3?
The shaft is removed, the bearing is pressed off/on, and the bracket bolts are torqued to spec. Many workshops replace the complete intermediate shaft assembly to save time and ensure longevity. Always use quality parts and check seals where the shaft enters the transmission.