Parts for your 2021 Mazda Cx-5-Thrust bearing

2021 Mazda CX-5 thrust bearing — what it is and when to worry

Based on Mazda’s KF CX‑5 workshop manual for the SKYACTIV‑G engines (crankshaft and main bearing sections), the vehicle uses a crankshaft thrust bearing integrated into the main bearing set to control end‑float. Mazda’s SKYACTIV‑Drive 6‑speed automatic transmission training literature also details internal thrust bearings used to manage axial loads in the gearsets. On turbo models, the IHI turbocharger core includes a thrust bearing for the compressor/turbine shaft. The front MacPherson strut top mount incorporates a rotation bearing (often called a strut mount bearing). So yes — a “thrust bearing” exists on the 2021 CX‑5, but it’s mostly an internal, non-routine service item rather than a standalone maintenance part.

For the 2021 Mazda CX‑5, the thrust bearing’s core job in the engine is to keep the crankshaft from walking fore and aft under clutch/torque converter and accessory drive loads. That axial control protects the crank, bearings, oil pump drive and timing hardware, and preserves smooth shifting and idle quality. In the automatic transmission, thrust bearings support axial loads within the planetary sets and drums, helping the 6AT stay quiet and efficient. On turbo models, the thrust bearing in the CHRA manages axial loads from boost pressure changes. None of these are scheduled service items, so owners won’t see “thrust bearing” on routine maintenance menus.

When should a CX‑5 owner think about thrust bearings? Mainly when there are symptoms: unusual longitudinal movement of the crank pulley, metallic glitter in the engine oil, odd transmission noises that change with load, or—on turbo cars—whistle/scrape and sudden oil use. Any of these warrant professional diagnosis. A technician will confirm crankshaft end‑float against Mazda specs using a dial gauge, inspect oil condition, and check transmission end‑play if required. Replacement of the engine’s thrust/main bearings involves sump and bearing cap work and is typically done during an engine rebuild, transmission thrust bearing work is part of a full trans overhaul. Turbo CHRA thrust bearings are usually renewed by replacing the cartridge or re‑building the core.

Helpful habits go a long way: use the correct Mazda‑spec engine oil and change it on time, avoid prolonged power‑braking or lugging the engine, keep the 6AT fluid serviced as per Mazda guidance, and let a turbo engine cool down gently after hard runs. If a customer is chasing a notchy steering feel at low speeds, that’s usually the front strut mount bearing (a separate part), not the engine or transmission thrust bearing.

• Key signs to act on: noticeable crank pulley fore/aft shift, glittery oil, load-dependent trans noises, sudden turbo oiling issues
• Typical remedy: diagnose end‑float, internal bearing service during engine/trans overhaul, CHRA repair on turbo models

Popular questions

Does a 2021 Mazda CX‑5 actually have a thrust bearing?
It does. The engine’s crankshaft uses an integrated thrust bearing within the main bearings, the 6‑speed auto has several internal thrust bearings, and turbo variants include a thrust bearing in the turbo core. These aren’t routine service parts, they’re addressed only if there’s wear or during an overhaul.

When would a thrust bearing need replacing on a CX‑5?
Only when there are symptoms or out‑of‑spec measurements. A technician would check crankshaft end‑float against Mazda specs, look for metal in the oil, and assess transmission or turbo end‑play/noise. Replacement is internal work: engine bottom‑end, transmission overhaul, or turbo CHRA service.

Is the steering strut top bearing the same as a thrust bearing?
No. The front strut mount has a rotation bearing for steering, often called a strut mount bearing. If there’s low‑speed steering notchiness or creaks, that’s the mount bearing. The engine/trans thrust bearings are internal and unrelated to steering feel.