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Post by deeppurple on Dec 16, 2008 20:02:36 GMT 11
Hey guys I have had a long standing problem with my front pipe coming loose where it mounts to the turbo after towing. My front pipe is secured with bolts rather than studs and nuts that the parts book recommends, do you think this might be part of the prob? I had the turbo replaced this year and the garage sys that they always fit bolts rather than studs. any ideas?  Cheers Chris |
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Post by geeves on Dec 17, 2008 6:35:57 GMT 11
It is strange. Normaly the opposite happens ie they never come loose even when you want them to. The studs are threaded into the turbo so the options of useing bolts would be either screw the bolt through which is the same as a stud or use a smaller bolt which although unlikly could cause the issue. They have used spring washers havent they?
Only other answer I can come up with would be to make up a tab washer from thin brass or stainless steel sheet. Make 1 washer that fits all 4 bolts or if its easier 2 fitting 2 each.
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Post by James W on Dec 17, 2008 15:07:56 GMT 11
Spring washers arn't much use in this kind of situation, they don't hold the original torque. When tight they turn into flat washers and only start to do something once the bolt becomes loose. To set and hold original torque use locknuts, star washers, lock tabs and/or theadlockers such as locktite....
Other than that, you may need to look at what thread is being used... has it been modified? what pitch is the thread? what angle or profile is the thread?... and what happens when they are tightened... like are they hitting the bottom of the hole rather than really pulling up tight.... I suspect thermal contraction and expansion is working them loose.
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Post by mulover on Dec 18, 2008 11:16:12 GMT 11
Hey all, when i did my exhaust i replaced all of my studs with stainless steel bolts and spring washers, and have never had a problem.
Another type of washer you could try is a cone washer, its a special type of locking washer that has sharp ribs all around it on both sides and bites into both surfaces.
You could try loctite, but you'll have to get the special hi temp stuff and even then i don't think it will handle the heat. Heat generally softens locktie anyways. I wouldn't like to undo them afterwards!!!.
You could also try a bit of maniseal, I think CRC make it, it sticks like sh#*t to a blanket and could help hold them in, and it can handle the heat.
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