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    Stainless Steel Nuts & Bolts

    A few listings lately and sales regarding stainless steel nuts & bolts. I personally am a bit cautious about using them on the exhaust manifold. I don't know if any reaction between s/steel and alloy occurs as in the head bolts,which as we all know is the reason that so many are a pig to get off. I looked the bolts up in a nut & bolt suppliers catalogue and the following guide was printed.

    Stainless steel bolts are not High Tensile and must not be used for stressed connections.

    Zinc Plated bolts after plating remain slightly weaker than unplated bolts. For maximum strength specify unplated (black) bolts.

    Over the years it has been tradition to fit black studds with brass nuts. The reason that some break is because they have been fitted with steel nuts and they have rusted of corroded together. With brass nuts they can usually be removed by hook or by crook by splitting the soft brass nut. The s/steel bolt would probably shear on anything more than 15lbs /ft leaverage and might involve heads off or engine out to remove the snapped end. I would imagine they are O.K. for inlet manifold or covers etc. where they do not get a lot of stress or tighness .

    Any opinions?

    Bob

    #2
    imported post

    I'm far from an expert on this subject but I'm inclined to agree, the main reason for using stainless steel is cosmetic, its not good for high tensile applications.

    If I do have to remove my inlet manifold ( I'm just keeping an eye on it for now) I will definitely use new bolts, I'm hoping to avoid it because if anything is going to break it will be while undoing the old bolts, who knows how long they have been there and if any copper grease has been used:?
    ZF 4 spd box, Datsun shafts, SS exhaust, 38DGMS weber 158.9bhp, BMW MC Tomcat seatssigpic

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      #3
      imported post

      Removing the bolts in the inlet manifold should not be too bad as the torque involved is quite low, what is more likeley to happen is the soft aluminium thread in the head will strip and the bolt will come out quite easily, and even more likeley to happen when re-assembling. A little bit of advice but one learnt from experience - buy a 1/2" unc helicoil kit and helicoil all the inlet manifold threads before reassembly as it will save you taking off all those really awkward to get at bolts three times. Why is it always the last bolt on the last tighten that strips?!

      Dave

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        #4
        imported post

        Thanks, I've read about helicoils on several threads, but I've never used them before, and its a long time since I've used a tap and die. Its always easy to use the 'ostrich' approach and hope the problem goes away. I know it won't but the leak is no more than a weep at the moment, which seems to stop as the engine heats up so I'll see how it goes.
        ZF 4 spd box, Datsun shafts, SS exhaust, 38DGMS weber 158.9bhp, BMW MC Tomcat seatssigpic

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          #5
          imported post

          dogsnadgers wrote:
          buy a 1/2" unc helicoil kit and helicoil all the inlet manifold threads before reassembly
          Dave
          Great idea, I have done all my threads that go into the heads. One point, its not 1/2" UNC its 5/16"UNC for all except a couple around the PAS pump which are 3/8" UNC.

          Not found any 1/2" UNC yet. - Alan

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            #6
            imported post

            It'd be nice to know for certain which kit to get
            ZF 4 spd box, Datsun shafts, SS exhaust, 38DGMS weber 158.9bhp, BMW MC Tomcat seatssigpic

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              #7
              imported post

              Hi Kevin

              For the inlet manifold bolts you need 5/16 unc. You can buy a kitmade by Re-coil which I have used myself, easy job, with 10 inserts, special tap and insert tool for £27.18 inc p+p the only other thing you need is a 21/64 drill.

              (we seem to have changed threads, joke, this one should have been on the Bournemouth run) this is supposed to be about stainless steel bolts on the exhaust manifold.

              Bob

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                #8
                imported post

                Thanks Bob,

                And point taken about the change of threads, its very easy to meander off course

                Kevin
                ZF 4 spd box, Datsun shafts, SS exhaust, 38DGMS weber 158.9bhp, BMW MC Tomcat seatssigpic

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