Parts for your 2018 Mazda 3-Thrust bearing

2018 Mazda 3 thrust-bearing: what it does and when to service it

Based on technical sources, a thrust bearing is relevant to the 2018 Mazda 3. The SKYACTIV‑G engine uses thrust faces within the crankshaft main bearing set to control end float, and manual-transmission models also use a clutch release (thrust) bearing. This is documented in the Mazda3 (BM/BN, MY2018) Workshop Manual: Engine Mechanical – Main Bearings/Crankshaft End Play, and Manual Transmission/Clutch – Release Bearing, and is supported by the Mazda Electronic Parts Catalogue, which lists the crankshaft main bearing set with thrust elements and the clutch release bearing for 6‑speed manual variants.

In plain terms, a thrust bearing’s job is to manage axial loads. In the engine, it keeps the crankshaft from walking forwards and backwards under clutch and accessory loads, protecting the block, crank, and transmission. In manual models, the clutch release (often called a thrust bearing) lets the clutch pedal action smoothly load the pressure plate without gritty noise or drag.

For owners of a 2018 Mazda 3, care is simple but important:

• Engine thrust bearing: It’s not a routine replacement item. Healthy oil pressure and clean engine oil are key to its long life. If there’s unusual crank pulley movement, metallic scraping with clutch use, or odd axial play picked up during service, a technician will check end float as per the workshop manual.
• Clutch release (thrust) bearing: On 6‑speed manuals, it’s standard practice to replace it whenever the clutch kit is renewed. If there’s a chirp, whirr, or growl when the clutch pedal is pressed, or a notchiness that eases when the pedal is down, the bearing may be tired.

Service tips the workshop will back:

1. Stick to quality oil and on‑time changes, thrust surfaces rely on a solid oil film.
2. Avoid riding the clutch or holding the car on a hill with the pedal, that cooks a release bearing.
3. When doing a clutch, replace the release bearing, pressure plate, and disc as a set, and inspect the fork and pivot.
4. If the engine or gearbox is out for any reason, it’s a good moment to measure crank end float and inspect bearing faces.

With the right servicing approach, the 2018 Mazda 3’s thrust bearings quietly do their job for a very long time.

Popular questions

Does a 2018 Mazda 3 have a thrust bearing?
Yes. Every 2018 Mazda 3 has engine thrust faces within the main bearing set. Manual‑transmission models also use a clutch release (thrust) bearing. These functions are detailed in Mazda’s BM/BN Workshop Manual and reflected in the Mazda parts catalogue.

When should the clutch thrust/release bearing be replaced on a 2018 Mazda 3?
Replace it whenever the clutch is replaced, and sooner if there’s a noise when the clutch pedal is depressed (chirp, whirr, or growl) or engagement feels rough. It’s a low‑cost part best done with the clutch because the labour overlaps.

What are signs of a worn engine thrust bearing on a Mazda 3?
It’s uncommon, but red flags include noticeable fore‑aft crank pulley movement, scraping noises that change with clutch use, inconsistent clutch engagement, or metal debris in the oil. A technician will confirm by checking crankshaft end float against workshop specs.