Parts for your 2007 Toyota Bb-Thrust bearing

2007 Toyota bB thrust-bearing — what’s actually fitted

Based on Toyota’s own technical documentation, a traditional clutch thrust (release) bearing isn’t used on the 2007 Toyota bB (QNC2# series). The Toyota New Car Features (NCF) and Electronic Parts Catalogue (EPC) for the QNC20/21/25 platforms list the driveline with a Super ECT 4‑speed automatic (Aisin) and a torque converter, with no manual gearbox option shown for this generation and market. Because there’s no clutch, there’s no clutch release/thrust bearing to service or replace.

Owners and workshops sometimes use “thrust bearing” to mean the clutch release bearing you’d find in a manual. On the 2007 bB that term doesn’t apply to the transmission at all. What the engine does have are crankshaft thrust bearings (thrust washers) integrated into the main bearing set, as documented in Toyota’s 1NZ‑FE and 2SZ‑FE Repair Manuals. Those control crank end float, but they aren’t a routine service item—inspection is only called for during engine overhaul or if diagnosing unusual axial movement.

Why isn’t a thrust bearing used? The automatic transmission relies on a torque converter to couple the engine to the gearbox hydraulically, so there’s no clutch fork, pressure plate, or release/thrust bearing in the bellhousing. That’s by design in Toyota’s bB of this era, which prioritised simple, urban-friendly auto drivability.

If someone reports a “thrust bearing noise” on a 2007 bB, it’s worth steering diagnosis toward components that actually exist on the car:

• Front-of-engine ancillaries: serpentine belt, idler/tensioner pulleys, alternator, A/C compressor clutch, water pump
• Automatic transmission/torque converter: fluid (ATF) condition, torque converter shudder, front pump whine
• Driveline and mounts: engine mounts, CV joints, wheel bearings

Good practice for longevity is straightforward: keep engine oil changes on schedule to protect the crank bearings and thrust faces, use the specified ATF and refresh it per service guidance, and listen for changes in noise or vibration under the bonnet. If crankshaft end float is ever suspected, a proper measurement against the Repair Manual spec is the go, otherwise, there’s no thrust-bearing service task for this model.

• Does a 2007 Toyota bB have a clutch thrust/release bearing?
  No. The QNC2# bB runs an automatic with a torque converter, so there’s no manual clutch hardware or release/thrust bearing fitted.
• Are there any thrust bearings in the engine, and do they need servicing?
  Yes—crankshaft thrust bearings are part of the main bearings. They’re checked during engine rebuilds or specific diagnostics, not as part of regular servicing. Regular oil changes help protect them.
• What noises get mistaken for a thrust-bearing fault on a bB?
  Common culprits include serpentine belt pulleys, the A/C compressor clutch, alternator bearings, or torque converter/front pump whine. ATF condition and engine mounts are also worth checking.