Author Topic: Exhaust Studs vs Bolts  (Read 122 times)

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Offline Wakie

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Exhaust Studs vs Bolts
« on: November 27, 2017, 10:28:45 AM »
Hi Guys

I just wanted to get some info on whats best regarding exhaust stud replacement.

Do you replace the stud or screw a bolts in the holes. Whats your thoughts and why

Regards


Offline SA SCOOTERS

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Re: Exhaust Studs vs Bolts
« Reply #1 on: November 27, 2017, 08:30:31 PM »
Hi Guys

I just wanted to get some info on whats best regarding exhaust stud replacement.

Do you replace the stud or screw a bolts in the holes. Whats your thoughts and why

Regards

You put in exhaust studs. They are normally made from mild steel, so they heat up and cool down (same expansion and contraction as the metal that the engine head is made from) Because of this expansion and contraction, the studs becomes very hard to remove after a while. Then you use exhaust nuts thats made from copper. The moment they heat up, they expand more than the metal the stud is made from, thus they lock into place.
 
If you are going to use bolts, the following will happen.
Every time you want to remove the exhaust, you must remove the bolt. After a while that bolt is going to be hard to remove and there is a very good chance to spoil the thread. Because the bolt has weakened over time, it might also break clean off. This would then result in you having to tap the broken bolt out and re-thread.

The objective with studs is to have something that you dont mess around with. Only if you strip the thread of a stud, will you have to replace the stud.

Another very practical reason comes to light when installing an exhaust. Much easier to just slip the exhaust header over the studs, than trying to keep the header there while you try and enter the bolts.

Listen to an old man's advice.....it will save you many hours.  :thankyou:
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Offline SA SCOOTERS

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Re: Exhaust Studs vs Bolts
« Reply #2 on: November 27, 2017, 08:36:05 PM »
And you only replace a stud if its thread is stripped. And usually its stripped because people use mild steel or any otherkind of nut, other than a proper copper nut. DO NOT USE MILD STEEL NUTS and then try and lock it with LOCKTITE. The stud will break if you try to remove the nut after a while. Or the thread will strip.

I dont see any other reason to replace a stud.


Please go and watch some youtube movies about stud extraction, etc.  If you dont have the right tools, you end up taking the scoot to someone. You will also see the heap of sh*t you can get yourself into if the stud breaks off.
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Offline Wakie

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Re: Exhaust Studs vs Bolts
« Reply #3 on: November 28, 2017, 10:13:29 AM »
Thanks for that info, very helpful. :applause: