The 101 Association, Inc.
For the preservation and enjoyment of 1928 to 1931 Indian Scout Motocycles
"You can't wear out an Indian Scout"

Header sealant ?

  • 12 Aug 2019 7:46 AM
    Message # 7823594

    Good evening good morning members, where ever you may be.  My inquiry now is ...sealant.  What type of sealant, if any, are you using on the header pipe, where it slides into the exhaust port of the barrel.  

  • 17 Aug 2019 7:35 PM
    Reply # 7833950 on 7823594

    If pipes slide into the exhaust port, then you have the later 1931-34 cylinders or 1934-39 Sport Scout Y cylinders. What I have heard working is plain clear bathroom silicone, it doesn't burn or melt.

    On the 101 the pipes seal with cones on the exhaust spigot and in the nuts. For others I explain what I have done with my 101 downpipes..

    I haven't used any sealant but put down some time to adjust the tube cones to the cylinder, carefully hammer and some carborundum. Exact tight fit like valve seat fit isn't needed at all. The nuts are supposed to clamp the cones to fit, but the tube material is thicker and sturdier on the repro downpipes, and I can't rely that the cylinder threads can take the nut force that would require, so I took the time to hammer them to fit. 

    The pipes need some slack to be able to slide into the collector and turned into place, and must not be clamped to the collector solid, the pipes have to be able to move because of vibrations and heat expansion. I haven't cared to use any sealing compound but if the gap is too big it might be possible to use a small exhaust pipe expander. Or bathroom silicone.

    Last modified: 17 Aug 2019 8:08 PM | Carl-Erik Renquist
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