Rear and Front Differential Fluid

[ECS Tuning]

A little fluid pump with a flex line would make it a bit easier. I have a little 1 gallon Motive Power Fill (LINK) at the house I use.

[TiAgX5]

The torque spec is 44 ft lbs front and rear (O-ring seal style), if you have a washer style plug in the rear, tq that one to 48 ft lbs. I reused the plug washer and torqued to 50 ft lbs to get a good seal. No leak.

[bugbyte]

Anyone know the torque spec for the bolts (drain and fill)? Is it going to be the same as the transfer case which is 24 lb/ft?

[bugbyte]

Originally Posted by TiAgX5

The torque spec is 44 ft lbs front and rear (O-ring seal style), if you have a washer style plug in the rear, tq that one to 48 ft lbs. I reused the plug washer and torqued to 50 ft lbs to get a good seal. No leak.

Thanx TiAgX5

[TiAgX5]

Originally Posted by bugbyte

Anyone know the torque spec for the bolts (drain and fill)? Is it going to be the same as the transfer case which is 24 lb/ft?

See post #12.

[cncmastr]

Make sure you buy new reinforcement plat bolts after you remove the plate to drain the front diff.

[Isambard]

Originally Posted by cncmastr

Make sure you buy new reinforcement plat bolts after you remove the plate to drain the front diff.

Which bolts are these exactly? I'm looking to change my diff oils at some point soon and want to do everything by the book as I HATE leaks more than I hate doing a job twice!

[SlickGT1]

Originally Posted by Isambard

Which bolts are these exactly? I'm looking to change my diff oils at some point soon and want to do everything by the book as I HATE leaks more than I hate doing a job twice!

The 6 bolts for the bottom engine plate. Which you have to remove for the front diff. The bolts are torque to yield, and need to be tightened to yield. Obviously the bolts cannot be reused when properly tightened.

[Isambard]

Originally Posted by SlickGT1

The 6 bolts for the bottom engine plate. Which you have to remove for the front diff. The bolts are torque to yield, and need to be tightened to yield. Obviously the bolts cannot be reused when properly tightened.

Thanks Slick, yep I know the ones, though I don't know why these have to be torqued to yield, the plate isn't sealing anything..

[cncmastr]

Originally Posted by Isambard

Thanks Slick, yep I know the ones, though I don't know why these have to be torqued to yield, the plate isn't sealing anything..

Please try to learn how to use RealOEM.com

RealOEM.com * BMW E53 X5 4.8is Frnt axle support,wishbone/tension strut

Qty 6 - 31101096987 - bolts
Qty 6 - 33306760587 - nuts


Part #4 in the picture.

You need to replace the bolts because once you torque them to spec, you need to twist the bolts a full 90 degrees. This stretches the bolt locking it into place. If you re-use your old bolts, you would need to turn them, an additional 90 degress or 180 total from when they were originally used.