Parts for your 2004 Lexus Is-Thrust bearing

2004 Lexus IS Thrust Bearing: What It Does and When To Service It

Technical documentation confirms a thrust bearing is relevant and used on the 2004 Lexus IS range. Both engines fitted to this model line — the 1G‑FE (IS200) and the 2JZ‑GE (IS300) — use crankshaft thrust bearings (thrust washers integrated at a main bearing journal) to control axial movement. This is specified in Toyota/Lexus factory repair manuals for the 1G‑FE and 2JZ‑GE engine mechanical sections and shown in the Toyota Electronic Parts Catalog. Manual-transmission variants also use a clutch release bearing (commonly called a thrust or throwout bearing), covered in the transmission/clutch sections of the same sources.

Sources: Toyota/Lexus Repair Manual (Engine Mechanical, 1G‑FE, Engine Mechanical, 2JZ‑GE) and Toyota Electronic Parts Catalog (crankshaft/main bearing set and thrust washers, clutch release bearing).

On a 2004 Lexus IS, the thrust bearing’s job is to keep the crankshaft from walking forwards and backwards under load. Every time the clutch is pressed on a manual, or when an automatic’s converter/pump loads the crank, axial force tries to shove the crank one way or the other. The thrust faces at a designated main bearing journal take that load, maintaining correct end float so the timing gear, rear main seal, and crank sensor relationships stay spot on. By keeping the crank centred, the engine runs smoothly, oil films stay intact, and there’s less chance of odd noises or premature wear.

In everyday servicing, the crankshaft thrust bearing isn’t a routine replacement item. It lives inside the block and is assessed during engine work. Good oil and sensible driving habits go a long way: fresh, correct‑spec engine oil and filters at proper kilometre intervals help the bearing keep its hydrodynamic film, avoiding riding the clutch and sidestepping hard clutch dumps keeps axial loads civilised.

There are a few tell‑tales owners and technicians watch for. Excessive crank end play can show up as a change in engine note or pulley/flywheel contact noises. On manuals, a scraping or change in idle when the clutch pedal is dipped can suggest axial movement issues — although that can also point to a tired clutch release (thrust) bearing. During clutch replacement on a manual IS, the release bearing should always be renewed, it’s a relatively cheap part that saves pulling the gearbox again. If the engine is out for major work, checking crank end float with a dial gauge and inspecting the thrust faces is standard practice. If wear is found, the main bearings (including the thrust pair) are replaced as a set, end float is measured against the Lexus spec, and graded bearings are selected as required.

A quick note on terminology: parts catalogues sometimes call the manual’s clutch release bearing a “thrust” bearing. That’s a separate part from the engine’s crankshaft thrust bearing. Both exist on a manual IS, automatics omit the clutch release bearing but still have the crankshaft thrust bearing.

• Best practice: keep oil quality high, avoid clutch abuse, replace the clutch release bearing with every clutch, and measure crank end float whenever the engine is open.
• If end float is out of spec, investigate clutch hydraulic issues, crank thrust face wear, and main bearing condition before reassembly.

Popular questions about 2004 Lexus IS thrust bearings

Where is the thrust bearing on a 2004 Lexus IS?
The engine’s thrust bearing is integrated at a main bearing journal (thrust faces on the main bearing shells) inside the block. On manual cars, there’s also a clutch release bearing inside the bellhousing that acts on the pressure plate fingers. They serve different roles and aren’t interchangeable.

What symptoms point to a worn thrust bearing?
For the engine thrust bearing: noticeable crank pulley movement, rubbing noises near the front or rear of the engine, or changes in idle when axial load is applied. For the clutch release bearing: whirring or growling that changes when the clutch pedal is pressed. Proper diagnosis includes checking crank end float with a dial indicator and inspecting the clutch hardware.

Should the thrust bearing be replaced during a clutch job?
The clutch release bearing should absolutely be replaced with the clutch on a manual IS. The engine’s crankshaft thrust bearing isn’t replaced as routine, it’s inspected during engine work and renewed only if measurements or wear indicate it’s needed.