Junkers88

It may sound like an easy question but I don't know enough about metalurgy to know "yes or no". My exhaust keeps coming lose at the union between the doww tube and the manifold. I replaced the studs and nuts with factory replacements and the nuts are brass. Can I put a lockwasher under them and not cause any odd reactions with the metal and heat?


Please don'e me.

flashkl

Not sure on the metalurgy bit, but why not use high temp loctite? Lock washers don't really do much to keep a nut from coming loose anyway... I'd say either get a couple stover nuts and use those, or just loctite the brass ones up.

a4runnerfreak

Lock washers are fine. But I don't see the real reason for the brass nuts for the exhaust bolts tho. Brass is a pretty soft metal, IIR.....

Junkers88

I have some blue locking stuff that I used on my skid plate but I think it'll burn off. I can try it and see what happens I guess.

874runnersr5

ah, im taking metalurgy. Yeah it should be fine, brass wont react with it i think..

just use some lockwire. thats what we do in the aircraft business.

86Toyrunna

double nut it, also known as jam nuting.. tighten one nut down and then run another down on to it and tighten against eachouther. if you use this method with the brass nuts be carefull.. you could end out pulling the threads out of the nuts when tighting it down.

874runnersr5

yeah, or cotter pin it?

Junkers88

That double nut idea may be the ticket. Using wire won't work in there due to the limited amount of room I have to work in. It just irritates me since I can tighten them down and drive to work with no ticking and then on the way home the noise comes back.



I'll go see if I can find 6 more brass nuts and get this fixed.

slisdexia

or you could stake it too. take a metal chisel and mash the threads into the nut or the other way around. 240,241, whatever works

75k5toy

Lock washer?

iamsuperbleeder

hmmm.... I just installed lock washers with my new manifold studs and nuts

and they're brass nuts...

but I just did it yesterday so we'll see if it holds up

I re-torqued them today after driving it and cycling the temperatures, and they were still pretty tight... but I guess we'll see

874runnersr5

yeah, lock washers do a pretty good job. We had 2 classes on selflocking devices..

iamsuperbleeder

2 classes? how many different types of self locking devices can there be?

86tuning

Perhaps your exhaust is not properly hung under the vehicle? Missing or broken exhaust hangers often cause the exhaust to rattle loose.

874runnersr5

haha yeah, it was a boring two hours.
for aviation there are tones. all the mil specs and what the codes mean.
big pita

Junkers88

I hadn't thought of that. I'll check in the morning just to be sure. Thanks for the help.

SwampThing

I always just used stovers on mine. No problemo. Just don't use those vinyl lock nuts on those exhaust mani's lol... Makes it HELL to clean off after it's been baked on to thread a new nut onto it.

turborich

lock washers are just fine, I have never had a lock washer come lose if properly tightened.

874runnersr5

haha our teacher was telling us how a guy he worked with use one of those selflocking nuts. He used it in the engine and he said it was the biggest clean up ever.

xzyragon

after going through the BMR and the Airman books, its get AWFULLY boring. I got all the answers though