Torque Spec for 8x130mm bolts (235/5 or other) Trans (Byron?

[markmac]

Just noticing that my newly rebuilt 235/5 trans is missing one of the long bolts (8x130mm) that hold the end and sandwich sections together (to the bell).  I figure Byron knows as he just rebuilt one of these for Jeff H (if anyone else knows I'll take it).  Thanks

[gracer]

18-20 lbs/ft.  or quick rattle gun tight.  I have built several of the five speeds in the past.

[visionaut]

Mark - IIRC, the 235/5 specs incl torques are in the BMW Repair Manual, Gearbox section…

 

https://www.bmw2002faq.com/articles/technical-articles/history-and-reference/bmw-2002-service-repair-manual-r247/

 

Tom

 

Edited April 27 by visionaut

[jimk]

Pretty damn tight or the seam leaks.

[stephers]

Follow the good German well respected professor of engineering   theory    Professor Gooduntite!!

 

Thanks, Rick 

[Preyupy]

Gordon is right.  It’s still a 8 mm bolt in an aluminum thread. I have been using my calibrated elbow for the last 40 years on those. Finding that bolt will be much harder. Call if you need one I’m a horder, I’m sure there are a few laying around here somewhere.  

[visionaut]

Yep, you guys are spot on. It’s cited as 25Nm ( 18.1 ft-lb) for Housing bolts for the 235/5... 

 

That 8x130 bolt is WIDELY used across many Bimmers and lots of usages (steering pumps, alternator mounts beside transmission housings), so still available everywhere.

 

[markmac]

Thanks for the info (and the offer Byron).  I had a couple stashed away - hopefully that is all that is / was missing.....jeeze.  It would be interesting to see what BMW would send you.  You can find 8x130mm partial thread bolts in a number of places in zinc and gold zinc but not in black oxide.  Not sure why that is really.

[Mikesmalaga72]

Black oxide is usually reserved grade 10.9 or higher bolts.

2 hours ago, markmac said:

Thanks for the info (and the offer Byron).  I had a couple stashed away - hopefully that is all that is / was missing.....jeeze.  It would be interesting to see what BMW would send you.  You can find 8x130mm partial thread bolts in a number of places in zinc and gold zinc but not in black oxide.  Not sure why that is really.

 

[markmac]

It is - you are right, in the case of the ones in the 235/5 they are indeed black and at the same time grade 8.8.

 

Did a quick search on the part #, the usual cast of characters came up (ECS Tuning/Turner Motorsport)  $2.99 Ea and the appear to be finished in gold zinc.

Edited April 28 by markmac