Thrust Bearing
WARNING: This page is about a different car, the 2002 Lexus LS 430. However, it is still accessible from the selected car via links, so may be relevant.
Install thrust bearing on No. 3 main bearing journal with grooves facing outward, toward crankshaft. Thrust bearing must be replaced if crankshaft end play is not within specification. See CRANKSHAFT, MAIN & CONNECTING ROD BEARINGS table under ENGINE SPECIFICATIONS.