Parts for your 2019 Lexus Is-Thrust bearing

2019 Lexus IS thrust-bearing — what it does and how it’s serviced

Based on the Lexus Repair Manual for the 2019 IS range, the Toyota/Lexus Electronic Parts Catalogue, and Aisin automatic transmission service literature (AA80E/A960E), the 2019 Lexus IS does use a thrust-bearing. It’s part of the engine’s main bearing set (thrust washers controlling crankshaft end-float). A separate clutch release/throw-out “thrust” bearing isn’t fitted because all 2019 IS models in this market run automatic transmissions. The Aisin autos also contain internal thrust/needle bearings, though these are not user-serviceable items.

For the 2019 IS (including 8AR-FTS 2.0T and 2GR-FKS 3.5 V6 variants), the crankshaft thrust-bearing’s job is to keep the crank from walking fore and aft under axial loads. Those loads come from the torque converter and flexplate, the accessory drive, and geartrain forces. By controlling end-float, the thrust-bearing protects the engine’s oil pump gears, timing hardware, and crankshaft position control, and keeps the driveline feeling smooth when shifting into Drive or Reverse.

This thrust-bearing isn’t a routine replacement item. In normal service it lives a quiet life provided the engine gets clean oil at the right viscosity and on-time intervals. If the vehicle is looked after with quality oil and filters and the correct ATF for the Aisin auto, the thrust-bearing will typically last the life of the engine.

When work is required, it’s usually during an engine rebuild or if excessive end-float is measured. A technician will check crankshaft end-play with a dial indicator, inspect the thrust faces and main bearings, and select the correct OEM bearing grade. If wear is found, the main bearing set (including thrust washers) is replaced, the crank thrust faces are measured and polished or machined as needed, and clearances verified with plastigauge and micrometers before final torque-up.

• Watch for signs that suggest thrust wear: a dull knock when selecting Drive/Reverse at idle, visible in–out movement of the crank pulley, or metal in the oil. These are uncommon but worth checking if the engine has suffered lubrication issues.
• Good habits help: stick to logbook oil changes (typically 12 months/15,000 km), use the specified oil grade, and ensure the torque converter is fully seated during transmission refits to avoid undue axial loading.
• If the sump’s off for other work, it’s smart to measure crank end-float, catching excessive movement early can prevent bigger dramas.

Parts naming varies by catalogue: this may appear as “thrust washer, crankshaft” or as part of the “main bearing set”. Genuine or quality equivalent bearings with the correct grade coding are recommended.

Popular questions about 2019 Lexus IS thrust-bearing

Does a 2019 Lexus IS have a thrust-bearing?
The 2019 IS does feature an engine crankshaft thrust-bearing (thrust washers) to control axial movement. There’s no separate clutch release/throw-out bearing because the 2019 IS is automatic-only in this market. The Aisin automatic also uses internal thrust/needle bearings that aren’t serviced separately in regular maintenance.

When should the thrust-bearing be replaced on a 2019 IS?
It isn’t a scheduled service item. Replacement is typically considered during an engine rebuild or if excessive crankshaft end-float is found. If oil changes are done on time with the specified grade, the thrust-bearing generally lasts the life of the engine.

What symptoms point to thrust-bearing wear?
Uncommon but notable signs include a knock or clunk when selecting Drive/Reverse, visible fore–aft movement of the crank pulley, or metallic debris in the oil. Any of these warrants end-float measurement and an expert inspection before further driving.