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I noticed smoke rising out of my A4 after four minutes or so at idle. It doesn't smell like exhaust, but it could be. The hot section of the exhaust is wrapped with fiberglass, so I can't see the leak. Is there a way of repairing a small leak in the pipe, or should I simply replace the entire iron section per chapter 7 in the manual? Also, in the event that I have to cut the pipe off, how do I remove the flange bolts in the exhaust manifold? - Top
- If the hot section of your exhaust has developed a leak, you are much better off to replace it than to attempt a repair.
Removing the 9/16" hex-headed bolts of the exhaust flange can be a real problem if they have had water damage over the years. Your best chance is with a six-pointed box-end wrench and rubber mallet (or socket if space permits). If the bolts fail or break off, the easiest approach is usually to remove the manifold and take it to a shop to have the bolts ground off, drilled out, etc. If the hot section is not that large, you may be able to simply remove it from the inlet to the muffler, or by cutting it off as close to the manifold as possible with a hacksaw).
One of the benefits of removing the manifold is that you can have a local machine shop hot tank it to clean the water jacket. - Updated:
March 24, 2004
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