Torque values source - and a question

gt40mk2 · Post by **gt40mk2** » Wed Jun 10, 2015 9:08 pm

The malloc.nl server that carried the online version of the DVD version of the BMW shop manuals seems to be dead.

I have found another location for them here:

https://www.bmwtechinfo.com/repair/main/057en/index.htm

(I'm E12-based '79 so I'm using the E12 sections. Not sure about what's there for E28/E24.)

If you've never used it, navigation is a little weird. Each section has a Specifications section at the top of its index. Torque values are all here, but you have to wade through a lot of other specs.

Then there is the problem of the terminology and whether it's referring to what you think it's referring to. Hence my question. I'm finishing up a bunch of bushings and axle bellows work and I need to know:

Would Drive flange to rear axle shaft be the hex bolts that attach the half-shaft to the diff? The numbers are very high - around 300 ft-lb. If not, does anyone know what these should be tightened to?

hornhospital · Post by **hornhospital** » Thu Jun 11, 2015 6:43 am

Nope, that's referring to the nut that holds the drive flange on the front of the differential (goes to the pinion gear), where the driveshaft universal joint attaches.

gt40mk2 · Post by **gt40mk2** » Thu Jun 11, 2015 9:17 am

Thanks Ken. That's what I hear from FirstFives too, and that the hex bolts should be 43-48. Sound right to you?

hornhospital · Post by **hornhospital** » Thu Jun 11, 2015 1:44 pm

That sounds too low to me. My manual is at the shop, and I don't have the figures memorized..... I wouldn't trust my leaky brain to hold the info anyway.

gt40mk2 · Post by **gt40mk2** » Thu Jun 11, 2015 2:41 pm

We put them as tight as we could with a 150 lb manual torque wrench. It's still on the lift. I'm gonna dig deeper into the online manual to try and get it.

Brucey · Post by **Brucey** » Thu Jun 11, 2015 3:09 pm

gt40mk2 wrote:We put them as tight as we could with a 150 lb manual torque wrench....

I'm surprised you haven't broken something. These are M10 bolts IIRC; these will be torqued between about 40 to 80 Nm depending on the bolt strength grade and the application.

[edit; I looked in the online manual you linked to and the output flange spec on p33-511 for M10 bolts 60-67Nm looks right to me. These bolts are almost identical on E28 models too.]

cheers