BMW Rear Differential Seal Installer Set 33 5 130 / 33 5 140

A seal driver set built to the pattern of BMW special tools 33 5 130 (part 0495860) and 33 5 140 (part 0495862), the factory tools called up in BMW repair procedures for installing the radial shaft seals in the rear axle final drive. The set is two machined aluminum driver cups sized to the seal outer lip, a threaded steel spindle that pulls the cup in, and a fitted carry case.

A leaking diff seal on a BMW usually gets done with a socket and a hammer, and that is where the trouble starts. Tap one side of the seal and it cocks in the bore, the lip rolls, and the new seal weeps gear oil within a few hundred miles. A driver cup that bears on the whole outer face of the seal pushes it in evenly and stops it at the right depth, so the lip rides the flange where it was designed to.

On the bench or in the car: drain the final drive, pull the output flange or axle shaft, and pry out the old seal without scoring the housing bore. Clean the bore, then coat the seal lip and the housing flange face with the specified rear axle oil as the BMW procedure calls for. Start the new seal square by hand, set the matching cup over it, and draw it home with the spindle until the cup seats. Reinstall the flange or shaft and refill.

Look up the 33 5 130 / 33 5 140 callout for your chassis in the BMW repair information before ordering to confirm this is the tool your final drive uses. Seals and gear oil are not included.