Help! Valvetronic motor inner T25 torx bolts tightening torque
 

Hi, I am doing a VCG job on my E70 ( 2009/X5 4.8i) and kind of stuck at reinstalling the valavetronic motor

Anybody know what is the tightening torque for this spacer that goes before the valvetronic motor ? I tried to do 10NM with the old fasteners and the bolt broke right at the middle. Luckily, I was able to get it out without removing the valve cover

#13 and #15 in the picture is what I am talking about
https://www.realoem.com/bmw/enUS/sho...diagId=11_3606

I bought all new bolts and doing it all over again, it's really tight when I do it with a ratchet, but when I go for 10NM with a torque wrench, it still keep going. I am afraid if I am going to break the new bolts. Don't think my Craftsman torque wrench is wrong

10 ok for 6mm bolt those are 5mm.

Bewteen 6 and 8 N·m is spec for 5mm ranging from 8.8 to 10.9 grade.

11 00 Standard screw connection
Tightening Torques
TypeThreadTightening specificationsTorque
1AZScrews and nuts
M5 5 Nm


From newtis. Spec for 5mm screws coincidentally 5 N·m.

10 N·m is a fair amount of torque often enough to strip 6mm out of an engine block. 7-8 N·m about all you can do.

5 N·m torque for 5mm is BMW baseline.

Thanks a lot andrewwynn!

I am glad I didn't go all the way to 10NM with the new bolts, as said in some of the YouTube videos. Those guys are lucky they didn't break the bolt as I did

with the new bolts I did up to 7NM last night and it was just fine, then I thought let me try 8NM and it was still spinning as if it didn't bottom out at all. That's the point I stopped my work and decided to seek some help from the online community. Thanks again!

10.9 spec on 5mm is 8 but that's into steel not aluminum!

I've done destructive testing on 10mm bolts to see what they could take when torqued to vield multiple times. It's a very weird feeling when a bolt stops getting harder to turn it's an even weirder thing to watch the torque value climb up to 90 N·m and them just stay there through the last 45°

Do that 4-5x and a 10.9 10mm bolt will snap in half.