Using SST and a hammer, install a new oil seal.

Using a dial indicator, measure the inside diameter of the oil pump body bushing.

• Standard inside diameter:
• 38.138 mm (1.5015 in.)

If the inside diameter is greater than the standard inside diameter, replace the oil pump body.

Remove the O-ring from the oil pump assembly.

Lexus IS250 IS220d GSE20 ALE20 A960E AUTOMATIC TRANSMISSION

Coat 2 new O-rings with ATF, and install them to the brake reaction sleeve.

Using vernier calipers, measure the free length of the spring together with the spring seat.

• Standard free length:
• 23.74 mm (0.94 in.)

If the free length is shorter than the standard free length, replace the brake piston return spring sub-assembly.

Remove the 2 bolts and the transmission case cover.

Lexus IS250 IS220d GSE20 ALE20 A960E AUTOMATIC TRANSMISSION

Inspect the one-way clutch.

Using calipers and a straight edge, measure dimension A between the engine and the end surface of the drive plate (#1).