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Engine, Exhaust, Transmission Discuss the FR-S | 86 | BRZ engine, exhaust and drivetrain. |
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04-02-2022, 12:06 AM | #1 |
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Header nuts coming loose
Every 2 years or so I need to tighten my header nuts because I start hearing an exhaust leak. I want to add lock nut washers so I won't have to worry about it anymore, what size are the studs?
Last edited by B-R-Z; 04-02-2022 at 06:22 PM. |
04-02-2022, 08:23 AM | #2 | |
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04-02-2022, 10:07 AM | #3 |
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Thinking of adding only lock washers, I will go with M8 size?
https://www.homedepot.com/b/Hardware...vZc294Z1z0rvsl |
04-02-2022, 10:55 AM | #4 |
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Try some high temp copper anti-seize. It will reduce the thread friction which will increase the clamping force, at the same torque spec. If there is too much friction on the bolt threads, you will not reach the proper clamping force, and without the proper clamping force, you don't have the right amount of bolt stretch. Bolt stretch IS what prevents fasteners from loosening.
Or, get Nord-Locks. This is what the rally guys use, and if you don't use them, you're tightening everything between stages. The vibration is THAT bad under those conditions. |
04-02-2022, 11:55 AM | #5 |
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04-02-2022, 12:00 PM | #6 |
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The nord lock, lock nuts(that's a mouthful) are a lot better. I buy them in bulk for work, just not in metric sizes.
Or just get top locks. They are a distorted lock nut. This is what I run and mine have never come loose. They are a lot easier to find. I run these at all exhaust connections and on my sway bar endlinks.
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04-02-2022, 04:12 PM | #8 |
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Online for nord locks. Spring lock washers don’t hold well for long. Sent from my iPhone using Tapatalk
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04-02-2022, 05:15 PM | #9 |
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I can't find them top locks. Does this look right?
Bike Boltz 8 Nord Lock 5/16" M8 8mm Vibration Proof Lock Washer - Tension Tighting Fasteners https://www.amazon.com/dp/B016C5AZVU...ing=UTF8&psc=1 |
04-02-2022, 05:33 PM | #10 | |
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The Following User Says Thank You to dragoontwo For This Useful Post: | NoHaveMSG (04-02-2022) |
04-02-2022, 05:34 PM | #11 | |
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Those will work. Sent from my iPhone using Tapatalk
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04-02-2022, 06:02 PM | #13 |
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04-02-2022, 06:23 PM | #14 |
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