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Thread: Rivnut replacement/repair

  1. #1
    Join Date
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    Default Rivnut replacement/repair

    I have the fenders/wings off so itís time to think about the rivnuts. On the back left one was spinning loose but was accessible so easy to remove, another was spinning but not accessible so I had to cut it off. This leaves me needing to replace at least these two

    the holes are two big so I assume I need an alternate approach, especially the inaccessible one, I assume that at a push I can put a bit/washer on the other one.

    So, questions...

    1. Whereís the easiest place to get replacement bits? I couldnít see any at Home Depot etc.
    2. What is the best approach for tackling the oversized hole issue when I cannot get to the back of the hole?

    Iíve read about replacing with plastic, it seems the guidance is theyllnshear ifntheres impact, what are the pros and cons and where would I get plastic ones? I donít expect to spend much of any time on the track, in that case is it appropriate to considernplastic?

    Chris.

  2. #2
    Join Date
    Sep 2006
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    Southeastern Pa.
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    McMaster Carr has the nylon bolts and I believe some riv nut options. The nylon bolts definitely save your skin and rivnuts if you do hit a cone when Autoxing. Ask me how I know. Tom
    2000 Caterham Superlight #123
    1.8L VHPD Rover K Series
    2009 Caterham SV
    2.3L Cosworth Duratec

  3. #3
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    Default

    Chris,

    Ditto on the nylon bolts. Aloong with the nylon bolts, I use insulating rivet nuts to secure both my rear wings (fenders) and the front wing (actual aero wing on front for downforce) to the car. Last month while running at VIR, a cone sacrificed itself when it deliberately jumped in front of my car. The front wing was pretty much destroyed by the cone, but the nylon bolts sheared, thus preventing the wing mounting assembly from incurring any real damage. In 2015, I had an accident at TeXas World Speedway where I went airborne for a bit. During the impact with the ground, several the nylon bolts on both rear wings sheared. This save a lot of fab work and replacement of parts when I rebuilt the car. A cone was also sacrificed during this adventure.

    Useing a 1/4Ē nylon bolt, along with the appropriate sized insulating rivet nut, will require your drilling a 1/2Ē hole for mounting. However, it works great.

    Links us for both:

    https://www.mcmaster.com/#standard-rivet-nuts/=1cf92he

    https://www.mcmaster.com/#nylon-bolts/=1cf98nz

    also, Iíd go this route, you may have shorten a bolt here and there to keep it from bottoming out on a fraMe rail, etc. A rZor knife works well here.
    Stalker V8, chassis #85

    Stalker Chassis #85 Build Gallery
    Stalker Chassis #85 Owner Thread

    Get up in the morning and give the day your very best. You donít get it back.

  4. #4
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    The M5x25 nylon bolts are the right size for the existing rivnuts installed by Caterham.
    2000 Caterham Superlight #123
    1.8L VHPD Rover K Series
    2009 Caterham SV
    2.3L Cosworth Duratec

  5. #5
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    My thinking is that I’m reluctant to replace all of the rivnuts, does it make sense to get M5x25 nylon bolts to use on the existing rivnuts but 1/4” and re-drill the ones that are missing?

  6. #6
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    Quote Originally Posted by ukchris View Post
    My thinking is that I’m reluctant to replace all of the rivnuts, does it make sense to get M5x25 nylon bolts to use on the existing rivnuts but 1/4” and re-drill the ones that are missing?
    2000 Caterham Superlight #123
    1.8L VHPD Rover K Series
    2009 Caterham SV
    2.3L Cosworth Duratec

  7. #7
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    For the M5 Nylon bolts I thought when I took them out they were under an inch in length, I was thinking 20mm but you said 25? I suppose with nylon they’re easy to shorten... so 25mm or 20mm? Nylon washers or reuse the existing ones?

  8. #8
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    Quote Originally Posted by ukchris View Post
    My thinking is that I’m reluctant to replace all of the rivnuts, does it make sense to get M5x25 nylon bolts to use on the existing rivnuts but 1/4” and re-drill the ones that are missing?
    I would use the existing rivnut if usable. The insulating rivet nuts slide in the hole once drilled and can be easily replace if needed. But, if you can use your existing hardware, don’t reinvent the wheel.
    Stalker V8, chassis #85

    Stalker Chassis #85 Build Gallery
    Stalker Chassis #85 Owner Thread

    Get up in the morning and give the day your very best. You donít get it back.

  9. #9
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    Can you help me understand what you mean by an “insulating” rivnut? They don’t seem to be listed that way.

  10. #10
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    Doh! Found them!

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