I just bought a worn out 82 300sd. There are lots of problems with this car to work out, but I've decided the first one I'd tackle is this terrible exhaust leak that makes the engine sound like a jackhammer. I can hear the leak, and see the resulting smoke coming from behind the air cleaner, but I cannot locate where the leak is coming from. The pipes look solid. I felt around the flange right below the air cleaner, and didn't feel anything. Where else should I be looking?

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87 300D - Running on Veggie oil; 260,000 plus miles; Original #14 head

is it turbo? if it is the flex pipe could be the source..

Yes, it is a turbo. Which one is the flex pipe?

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87 300D - Running on Veggie oil; 260,000 plus miles; Original #14 head

Under the air cleaner connected to the rear of the turbo. Also make sure to check the crankcase breather hose that goes from the valve cover to the cleaner. Mine had a tear in the under side that I couldn't see. It drove me crazy trying to find where that smoke was coming from.

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Seth

1984 300D 225K
1985 300D Donor body
1985 300D Turbo 165K. Totaled. Donor Engine. It runs!!!
1980 300SD 311K My New Baby.
1979 BMW 633csi 62K+++? Dead odo