1985-1998 [Subscribe to Daily Digest] |
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Some of you may remember the saga of the "windy" or "whistle/whoosh" sound on my '96 Aero and that it turned out to be a leak in the exhaust joint between the turbo and the downpipe. Then you might remember my struggle to seal this joint. By this time I had a JT 3" downpipe, but when the problem started, I had the standard downpipe.
I finally noticed that one of the studs on the turbo had worked itself out a bit (I noticed it before, actually, but it had been like that for ages and I thought no more of it). Working on the theory that there was not enough thread left for the nut to pull the flange tight, I tried winding it back in. Although it seemed loose enough to turn back and forth slightly, it wouldn't go in. OK, so take it out, clean up the threads and put it back in. Still no go. Eventually, it came out, but left some of its threads in the turbo. So take the turbo out to re-tap the threads.
To cut an already long story a bit less long, I fitted three new studs (with copper anti-sieze compound!) and refitted the downpipe with a bead of copper anti-sieze around the edge, both to help it seat easily and to seal any leaks that may remain. I used new nuts as well. Started it up, allowed it to idle to harden the anti-sieze and it hasn't whistled since. I suspect the anti-sieze was overkill, but I didn't fancy pulling it all apart again.
Thanks to everyone who offered suggestions, and I hope this is of some help to someone in the future. The lesson is: If you are working at the downpipe flange and the studs unscrew a bit from the turbo, get them back in there and then lest they sieze and leave you with a leak that takes a lot of work to fix. I'm fairly sure I wasn't responsible for the original problem, but I certainly won't be responsible for a similar one in the future.
posted by 62.253...
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