an urgent question on diff torque settings

[deQuincey]

hi all

a friend of mine has dissasembled the rear diff, and now he is trying to assemble it again after some cleaning and re-greasing

the question is which is the apropirate torque setting for the main pinion

the diff ratio is 3/45 and is of 25% autoblock

your help will be mostly appreciated, he is in a hurry because is in his way to a classic-rallye competition in a couple of weeks:twisted:

regards

remark: detail of question: torque setting of nut number "3" in the attached drawing

 

[61porsche]

Diff

DQ,

Here is the section from the manual,
http://www.e9-driven.com/Public/Library/BMW-E9-Manual/pages/en/33110110.html#refertoc

In brief, there is a miniumum torque and a frictional reading that must be combined for a final result.

 

[Stevehose]

From the 2002 - similar issue with measuring resistance before and after removal and the need for bearing preload:

http://www.bmw2002faq.com/component...ewtopic/t,347925/highlight,differential+seal/

http://www.bmw2002faq.com/component...ewtopic/t,288769/highlight,differential+seal/

Search there for more info

 

[M5dCS]

torque

Assuming that you are using a new crush sleeve (#7 in the illustration) you tighten the pinion nut (#3 in the illustration) a little at a time until you have a turning resistance of about 25 inch pounds. Remember that this resistance spec is for having the pinion only installed in the diff case. I never attempt to just install a new pinion seal and then get things close, I've just had too much trouble from not really doing it right the first time. Good Luck, Leroy

 

[deQuincey]

thanks to all

it has been a real help, thanks, the different sources can be combined to find a path and proceed that way

regards