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  • Loctite 603

    This may be belt & suspenders but overkill is just right for me.

    I made a bushing to decrease the axle bore on a motorcycle fork slider and I've got .0015" interference fit.
    Is that too tight to use Loctite 603? (The slider is cast aluminum and the bushing is 6061)

    They give specs for how much of a gap it'll function with but they probably never considered a guy like me would buy the stuff.
    Len

  • #2
    What size is the bushing?

    Comment


    • #3
      OD is .7515". ID is .667".
      1.125" long
      Len

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      • #4
        ...I would use loctite or an interference fit, but not both.

        interested to hear what others think.
        "...do you not think you have enough machines?"

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        • #5
          Originally posted by Davidhcnc View Post
          ...I would use loctite or an interference fit, but not both.

          interested to hear what others think.
          Agree.
          Gene

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          • #6
            I agree with David. With an interference fit where would that leave the loctite?
            It needs a gap in order to function, without the gap there is no loctite.
            Home, down in the valley behind the Red Angus
            Bad Decisions Make Good Stories​

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            • #7
              Done and done.
              Thanks!
              Len

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              • #8
                Originally posted by Willy View Post
                I agree with David. With an interference fit where would that leave the loctite?
                It needs a gap in order to function, without the gap there is no loctite.
                It's only a press fit on average, there will be plenty of tiny voids for the Loctite to fill. The Loctite will make for better retention.

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                • #9
                  If you have the energy to do this, register to post over at ADVrider.com and go to the "Garage" sub-forum and look for the "Loctite" thread ... there's a member there named "Dirty Sanchez" who is a Loctite rep, who apparently monitors the thread and answers all questions related to Loctite and motorcycles...and your question sounds like it's right up his alley.

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                  • #10
                    From Loctite's 603 data sheet:-

                    "4. For Press Fitted Assemblies, apply adhesive thoroughly
                    to both bond surfaces and assemble at high press on
                    rates.
                    5. For Shrink Fitted Assemblies the adhesive should be
                    coated onto the pin, the collar should then be heated to
                    create sufficient clearance for free assembly."
                    Location- Rugby, Warwickshire. UK

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                    • #11
                      Don't forget the Loctite primer with an aluminum to aluminum bond, otherwise you're wasting your time. Aluminum is considered an "inactive" material.

                      Ed P

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                      • #12
                        Well...I ended up applying some anyway, mostly because I had to remove and install the bushing enough times that it was almost a slip fit by the time I was done.

                        Did NOT know about the primer, but the bushing is captured by a larger diameter on the axle on one side and a nut and washer on the other so it'll be fine.

                        Thanks all, as always I learned things.
                        Len

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                        • #13
                          Loctite being anerobic works only when you take the air away. That is why the bottles or tubes are never full. Pressing a part together will not remove all the loctite. The primer/accelerator gives a faster setup and back to service time. I used to wait 24 hours for red to setup on parts that had a lot of vibration. That gave the best service life. Mike

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                          • #14
                            Originally posted by Mike279 View Post
                            Loctite being anerobic works only when you take the air away. That is why the bottles or tubes are never full.
                            A very common misconception. The adhesive does react when there is no air, *and* in the presence of a catalyst. That catalyst is the metal. Sealing it up in a plastic bottle without air will not cause a reaction. It must have no air *and* be in contact with an *active* metal (or inactive metal and the primer).

                            Ed P

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                            • #15
                              When I was assembling the outboard pictured below I made a mistake and didn't use a primer for the anaerobic sealant between the two cases. I asked when buying the loctite if I needed a primer (which they didn't have on the shelf) and was told no, but then I see it mentioned in other places. I wish I would have found it and used it but in the end I didn't. The motor is on its third running season now and no problems but to this day it still bothers me. I don't see any case leaks yet either.

                              Andy

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