cylinder head bolt torque

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  • 02stu
    E30 Modder
    • Jan 2005
    • 872

    #1

    cylinder head bolt torque

    Quick question, what is the proper torque for m50 or s50 cylinder head bolts.
    Thanks
    Stu
  • ZiMMie
    E30 Modder
    • Jun 2004
    • 968

    #2
    86Inch Lbs. 10N.m
    for both small and the main bolts

    www.stancefactory.com

    Comment

    • PiercedE30
      R3V Elite
      • Apr 2005
      • 4220

      #3
      I thought the main bolts where 17 ft lbs plus 50 degrees.....
      My 2.9L Build!

      Originally posted by Ernest Hemingway
      There are only three sports: bullfighting, motor racing, and mountaineering; all the rest are merely games.

      Comment

      • ZiMMie
        E30 Modder
        • Jun 2004
        • 968

        #4


        www.stancefactory.com

        Comment

        • PiercedE30
          R3V Elite
          • Apr 2005
          • 4220

          #5
          hey, you have Mitchell On-Demand lol. so do I (at work).
          My 2.9L Build!

          Originally posted by Ernest Hemingway
          There are only three sports: bullfighting, motor racing, and mountaineering; all the rest are merely games.

          Comment

          • ZiMMie
            E30 Modder
            • Jun 2004
            • 968

            #6
            Originally posted by PiercedE30
            hey, you have Mitchell On-Demand lol. so do I (at work).
            any there is internet i got mitchell there also :)

            www.stancefactory.com

            Comment

            • 02stu
              E30 Modder
              • Jan 2005
              • 872

              #7
              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.

              Comment

              • PiercedE30
                R3V Elite
                • Apr 2005
                • 4220

                #8
                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?
                My 2.9L Build!

                Originally posted by Ernest Hemingway
                There are only three sports: bullfighting, motor racing, and mountaineering; all the rest are merely games.

                Comment

                • matt
                  No R3VLimiter
                  • Oct 2003
                  • 3731

                  #9
                  Originally posted by 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.
                  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...

                  Comment

                  • 02stu
                    E30 Modder
                    • Jan 2005
                    • 872

                    #10
                    Originally posted by 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?
                    No just 22 ft-lbs/30Nm.

                    Comment

                    • PiercedE30
                      R3V Elite
                      • Apr 2005
                      • 4220

                      #11
                      well that would be the problem right there.
                      My 2.9L Build!

                      Originally posted by Ernest Hemingway
                      There are only three sports: bullfighting, motor racing, and mountaineering; all the rest are merely games.

                      Comment

                      • 02stu
                        E30 Modder
                        • Jan 2005
                        • 872

                        #12
                        wait, if I followed the site and added an addition 90 degree torque angle I would have over torqued it even more

                        Comment

                        • PiercedE30
                          R3V Elite
                          • Apr 2005
                          • 4220

                          #13
                          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.
                          My 2.9L Build!

                          Originally posted by Ernest Hemingway
                          There are only three sports: bullfighting, motor racing, and mountaineering; all the rest are merely games.

                          Comment

                          • 02stu
                            E30 Modder
                            • Jan 2005
                            • 872

                            #14
                            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

                            Comment

                            • PiercedE30
                              R3V Elite
                              • Apr 2005
                              • 4220

                              #15
                              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.
                              My 2.9L Build!

                              Originally posted by Ernest Hemingway
                              There are only three sports: bullfighting, motor racing, and mountaineering; all the rest are merely games.

                              Comment

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