cylinder head bolt torque

[02stu]

Quick question, what is the proper torque for m50 or s50 cylinder head bolts.
Thanks
Stu

[ZiMMie]

86Inch Lbs. 10N.m
for both small and the main bolts

[PiercedE30]

I thought the main bolts where 17 ft lbs plus 50 degrees.....

[ZiMMie]

[PiercedE30]

hey, you have Mitchell On-Demand lol. so do I (at work).

[ZiMMie]

hey, you have Mitchell On-Demand lol. so do I (at work).

any there is internet i got mitchell there also :)

[02stu]

Dam, I torqued mine to 30Nm. I used this site which looks legit. http://tedserbinski.com/files/bmw_torq.pdf

Now the car is acting like it has a blown head gasket, so I guess that is why.

[PiercedE30]

30 NM is 22 ft-lbs. Did you do the additional 90 degrees of torque and then another 90 degrees after the initial torquing of 22 ft-lbs/30Nm?

[matt]

Dam, I torqued mine to 30Nm. I used this site which looks legit. http://tedserbinski.com/files/bmw_torq.pdf

Now the car is acting like it has a blown head gasket, so I guess that is why.

That site is legit, it says right under 30Nm that you need to do two 90* torque angles after that.


Doh.

Hey don't feel bad, I made a bigger mistake than that with mine...

[02stu]

30 NM is 22 ft-lbs. Did you do the additional 90 degrees of torque and then another 90 degrees after the initial torquing of 22 ft-lbs/30Nm?

No just 22 ft-lbs/30Nm.

[PiercedE30]

well that would be the problem right there.

[02stu]

wait, if I followed the site and added an addition 90 degree torque angle I would have over torqued it even more

[PiercedE30]

That's the idea. You torque it initially to 22 ftlbs. Then, you torque it down another 90 degrees (all bolts), then once you do that sequence, you do an additional 90 degrees in the same sequence.

[02stu]

So the information on that site is correct? Can add the torque angle now? or should I replace the bolts and gasket.
Thanks again for you help!
Stu

[PiercedE30]

Go ahead and do the torque angle, both of them. Do one sequence, then let it sit for about 10-15 minutes before doing the next sequence. That should let it get to where it needs to be. If the HG still leaks, then pull it off and put some studs in there with a new gasket.