Connecting Rod Bolts

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  • March 22, 2015 at 5:22 pm #996
    chris-p
    Participant

      Ive never had a bolt back out on me, YET, but would there be any negatives to putting a dab of Loctite, or 3M 847 on the threads of the rod cap bolts before torqueing, on the models that DONT have any locking tabs or safety wire?

      March 22, 2015 at 5:35 pm #12542
      wedgie
      Participant

        The negative with loctite would be that the caps would be hard to undo. I would use the medium strength /non permanent stuff if I thought there was a chance I would have to take it apart again….and I often do have to 😳 I asked this question on the old blue boards and F.R. said the loctite is an acceptable option if the locks were unavailable. Not sure the 847 would do much to stop the screw from unwinding

        March 22, 2015 at 5:37 pm #12543
        jeff-register
        Participant

          US Member - 2 Years

          Yes locktite 222 or 242 will work.

          March 22, 2015 at 5:42 pm #12544
          frankr
          Participant

            US Member

            Depends on what motor you are talking about. A dab of Loctite on one that uses lock tabs is ok, I suppose, but make sure don’t use so much that it wicks out into the bearing. On the other hand, rods with roller bearings are perfectly happy with no other safeguards than proper torque….which is an absolute MUST. Too little torque and they may come loose. Too much torque and they may break while running. And use an inch-pound torque wrench for better accuracy.

            March 22, 2015 at 5:51 pm #12546
            jeff-register
            Participant

              US Member - 2 Years

              Frank,
              Are you speaking of roller or needle bearings?

              March 22, 2015 at 7:15 pm #12560
              chris-p
              Participant

                I agree Frank, I have never used anything on the threads, but always wondered if a dab of the 518 or the like would help before sealing her up. Always use my inch/lbs torque wrench as well. I think Ill just stick to what has worked for me so far, nothing 😉

                Cheers thanks all.

                EDIT: Frank what do you recommend on the bushing motors with no lock tabs on them? An example would be say a ’57 QD where the wrist pins are non roller? OR do you mean just on the big end?

                March 22, 2015 at 7:46 pm #12563
                frankr
                Participant

                  US Member

                  Talking about the big end in all cases here.

                  Jeff, I call needles & rollers the same thing. Rollers are just fatter.

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