Parts for your 2014 Mazda Cx-9-Thrust bearing

2014 Mazda CX‑9 Thrust Bearing: What It Does and When To Service It

Based on technical sources including the 2014 Mazda CX‑9 workshop manual (Engine—Crankshaft/Main Bearings) and service literature for the Ford-sourced 3.7‑litre Cyclone V6, this model absolutely uses a thrust bearing. It’s built into the engine’s main bearing assembly to control crankshaft end float. The CX‑9 runs an automatic only, so there’s no clutch release bearing, however, the Aisin 6‑speed automatic also contains internal thrust washers/bearings that are not routine service items.

The thrust bearing’s job is to keep the crankshaft from walking forwards and backwards under axial loads. In a CX‑9, those loads largely come from the torque converter pushing through the crank, plus accessory drive forces. By holding end float within spec, the thrust bearing helps protect the main bearings, timing set, oil pump alignment and crank sensor/trigger accuracy. If it wears, the crank can shift, leading to odd noises at idle, inconsistent engagement when selecting Drive, or metal in the oil.

There’s no scheduled replacement interval for a thrust bearing on a 2014 CX‑9. It’s not a standalone “service” part—replacement typically happens during an engine bottom‑end rebuild. A technician checks crankshaft end float with a dial indicator, if it’s out of spec or there’s visible bearing face damage, the engine comes out, the sump and main bearing caps are removed, and the affected main/thrust bearing shells and crank thrust faces are inspected. It’s smart to pair new main bearings with the thrust set and verify oil clearances on reassembly.

Owners can help the thrust bearing live a long life by sticking to the correct engine oil grade and change intervals listed in the owner’s manual, keeping the transmission fluid at the specified level and spec, and avoiding harsh habits like neutral‑drops or sustained high‑stall launches that load the converter. If the vehicle develops a sudden scraping/whir from the front of the engine, inconsistent idle when shifting into gear, or you find glitter in the oil, get it checked—early diagnosis can save the crank.

For workshops, any time the engine is out or the bottom end is open (rear main seal, timing set, or oil pump work), it’s worth measuring end float. If wear is found, address root causes: low oil pressure, contaminated oil, or converter issues that may be overloading the thrust faces. This isn’t typically a driveway job, it needs proper measuring gear and clean-room assembly practice.

Popular questions about 2014 Mazda CX‑9 thrust bearings

Does a 2014 Mazda CX‑9 have a thrust bearing?
Yes. The 3.7‑litre V6 uses a thrust bearing integrated into the main bearing set to control crankshaft end float. The automatic transmission also has internal thrust washers/bearings, but these aren’t routine service items.

What are signs of a worn thrust bearing on a CX‑9?
Look for a light scraping or knock near the crank pulley at idle, the engine note changing when selecting Drive, visible fore‑aft movement of the crank pulley, or metallic debris in the engine oil. Excessive crank end float measured with a dial indicator confirms the diagnosis.

When should the thrust bearing be replaced, and what does it cost?
There’s no set interval—only if end float is out of spec or there’s damage. Replacement involves bottom‑end work with the engine out, so labour is the major cost. Pricing varies by workshop and whether the crank needs machining or replacement.