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Subject: Sealant on mating surfaces

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Kimberly    Posted 01-22-2021 at 18:42:11 [URL] [DELETE]        [Reply] [Email]  
  • Sealant on mating surfaces
  • I am making progress on getting the Old Girl back together; sometimes you just have to make do. My question is what sealant, if any, to use on the mating surfaces? I will be getting the trumpet back on; I have all the gaskets on hand. Do I use any sort of sealant on the trumpet/centre housing surfaces or just the gasket without any sort of sealant?

    Greg NE    Posted 01-22-2021 at 23:51:06 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Sealant on mating surfaces
  • I have found and read that the trumpet gasket works and fits best if you soak it in water right before you assemble the parts. They are a little small dry but if you let them soak they fit good. No sealer needed.

    Kimberly    Posted 01-23-2021 at 10:10:41 [URL] [DELETE]        [Reply] [No Email]  
  • Thanks Greg; what about the torque on the bolts?
  • I am guessing they need to be torqued to around 30-40 lbs giving the size of the studs?

    Kimberly    Posted 01-23-2021 at 17:47:09 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Thanks Greg; what about the torque on the bolts?
  • Also, dry or wet threads when torquing?

    TheOldHokie    Posted 01-23-2021 at 18:21:24 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Thanks Greg; what about the torque on the bolts?
  • Standard torque for 7/16-20 grade 5 plain steel is 46 lb-ft dry. Rule of thumb for plain steel fasteners is to reduce torque by 30% for oiled threads and 40% if using Loctite.

    TOH

    Bruce(OR)    Posted 01-23-2021 at 18:09:50 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Thanks Greg; what about the torque on the bolts?
  • Torquing is generally better with lubed fasteners. Doesn't have to be dripping.

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