Parts for your 2004 Mazda 6-Thrust bearing

2004 Mazda 6 Thrust Bearing — What It Is, Where It Lives, and When to Replace

Yes, the 2004 Mazda 6 uses thrust bearings. Technical references from the Mazda factory Workshop Manual for the GG/GY series (2002–2005) confirm two relevant parts: a crankshaft thrust bearing integrated into the main bearing set (controls crankshaft end float), and on manual models, a clutch release “thrust” bearing in the clutch assembly. The Workshop Manual sections for Engine (L3‑VE 2.3 and AJ 3.0) cover crankshaft end play measurement and thrust bearing fitment at the centre main journal, while the Clutch section details the release bearing. Mazda’s Electronic Parts Catalogue for GG/GY also lists these components by VIN.

On this Mazda 6, the engine’s thrust bearing keeps the crankshaft centred, handling axial loads from clutch operation, accessory belt pull, and torque converter thrust on autos. If it wears, the crank can “walk”, which is rough on the block, rear main seal, and timing gear. In manual cars, the clutch release (thrust) bearing lets the pressure plate be disengaged smoothly, when it’s tired, drivers will hear growling or squealing with the pedal pressed.

For everyday servicing, the crankshaft thrust bearing isn’t a routine replacement item. It’s checked when the engine is out, during bottom‑end work, or if there are signs of end‑float issues. A competent mechanic will measure crank end play and, if out of spec, fit a quality main bearing set with the correct thrust halves and verify oil clearances. Good engine oil, not riding the clutch at the lights, and a healthy clutch hydraulic system all help reduce thrust loads.

On manual 2004 Mazda 6 models, it’s smart practice to replace the clutch release bearing whenever the clutch kit is done. Use a reputable bearing, apply only the specified light high‑temp grease to the input sleeve and fork contact points, and bleed the hydraulics. If it’s an auto, there’s no clutch release bearing to worry about, but the engine still relies on its crank thrust bearing—so any engine-out job is a handy time to check end float.

• Common clutch thrust (release) bearing symptoms: noise with the pedal depressed, rough pedal feel, difficulty selecting gears.
• Possible engine thrust bearing symptoms: noticeable crank pulley in/out movement, idle change when pressing the clutch, rapid rear main seal wear.

Technical sources: Mazda GG/GY Mazda6 Workshop Manual (Engine: Main Bearings/Crankshaft End Play, Clutch: Release Bearing), and Mazda Electronic Parts Catalogue for GG/GY.

FAQs

Does a 2004 Mazda 6 have a thrust bearing?

It does. All engines use a crankshaft thrust bearing, and manual-transmission cars also have a clutch release (thrust) bearing. The Mazda workshop manual for GG/GY models details both.

What are the signs the clutch thrust (release) bearing is failing?

Usually a growl, whirr, or squeal when the clutch pedal is pressed, sometimes a notchiness in pedal feel, and harder gear changes. Noise that appears only with the pedal down is a classic giveaway.

Should the thrust bearing be replaced with the clutch?

On manuals, yes—replace the release bearing with every clutch kit. It’s inexpensive insurance while the gearbox is out. The engine’s crank thrust bearing is only replaced if end float is out of spec or during bottom‑end work.