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Striped out thread fix

Discussion in 'General CB Services Discussion' started by sunbulls, May 30, 2021.

  1. sunbulls

    sunbulls Sr. Member

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    What you’re looking at is the inside mic clip portion on a Cobra 29LTD cover. The two holes the nuts are covering were striped out by someone that over tightened the sheet metal screws. The application of PC-7 Epoxy Paste solved this problem. M3 screws are the popular size that is used on most CB chassis and I wanted to maintain the same M3 size consistency throughout. The M3 nuts I’m using are stainless steel so soldering them in place is not an option. To form the hole alignment plus maintaining stability while waiting for the paste to cure (24 hours), I simply screw down the nut to the inside of the chassis. Care is taken so that the screw thread does not go beyond the nut after tightening. I have some short screws that fit perfect, but adding washers to a longer one will do. The idea is that you only need to envelope the sides of the nut. Getting any paste on the threads will make the screw difficult to remove. Once cured this paste becomes rock hard. Afterwards you can remove the screw and apply any length or matching crew. I use JB Weld on many other repairs, but it’s not strong enough for this job.

    PC-7 repair.jpg


     

  2. Shadetree Mechanic

    Shadetree Mechanic 808 On The North Side of Dover

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    I was getting ready to say JB until I read that last line. I will have to check out the PC7. Do you have a picture of the package?
     
  3. DXman

    DXman Yes, that's 3100 degrees F. Nine yrs of hard work.

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    Tip: when applying any type of thread repair, just coat the threads with "Pam" cooking spray or Johnson Past Wax and you won't have any problems with not getting the screw or bolt out.
     
    S&W357, sunbulls, Eldorado828 and 4 others like this.
  4. sunbulls

    sunbulls Sr. Member

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    It comes in cans for large jobs, but I just buy the small two part cylinder for my purposes. For strength, PC-7 is like JB Weld on steroids, but the downsides is the 24 hour or longer curing time. I usually poke it with my fingernail or small screwdriver to test for hardness. Knead the two parts together until it remains the solid gray color. I generally use my fingers during the final application. It sticks on any surface as if it's putty or bubble gum. No rush during the application or messy cleanup afterwards, just the wait time involved.
    PC-7.jpg
     
  5. DXman

    DXman Yes, that's 3100 degrees F. Nine yrs of hard work.

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    Using Vinegar will also help in removing it from hands, etc. before it hardens.

    Does it say what the temperature rating is?
     
  6. sunbulls

    sunbulls Sr. Member

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    Application temperature range is 35 to 115 degrees F
    Service temperature range is -20 to +200 degrees F
     
  7. Shadetree Mechanic

    Shadetree Mechanic 808 On The North Side of Dover

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    I just got some to have on hand, thanks.
     
  8. 144inBama

    144inBama Electricity doesn't kill you, ignorance does.

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    Belzona 1111...it's stronger than most of the things you'd put it on around the house.
     
  9. TheRealPorkchop

    TheRealPorkchop Certified Sith Pimp

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    rivet nut
     
  10. Captain Kilowatt

    Captain Kilowatt Professional Amateur
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    I

    I don't remember the formulation right at the moment but we use Belzona at work for temporary repairs of aluminum dies until they can be removed and welded. Maintenance has used it to repair bearing races and shafts until parts can be machined. It is very good stuff but a bit pricey. Once it sets it's like JB Weld on steroids. It will withstand our use to 400 degrees F easily.
     
    144inBama likes this.
  11. 144inBama

    144inBama Electricity doesn't kill you, ignorance does.

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    That's what we use it for around the mill. We also use it to patch holes in HardOx (AR plate) on our material chutes used to transport nickel, chromium, silica and the such until a welded patch can be put in place. Have also used it to patch a pump housing....3 years ago and it's in service.
     
    Captain Kilowatt likes this.

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