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Join Date: Apr 2005
Location: Olympia, WA
Posts: 236
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Exhaust leak or broken head stud leak?
Ok, I just picked up a '77 911 with a 1979 3.0 SC engine. It runs well, but there is a sound like an exhaust leak. It is a "snap" sort of.
I have not looked into it yet, but does a broken head stud cause such a sound? Just curious before I pass out.... Mike the no PPI guy. (What a maroon...) |
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04-23-2005, 12:16 AM
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19 years and 17k posts...
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A broken or loose head stud causes a characteristic "Pffaaat Pffaaat" sound, almost like a leak in the exhaust system...
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Art Zasadny 1974 Porsche 911 Targa "Helga" (Sold, back home in Germany) Learning the bass guitar Driving Ford company cars now... www.ford.com |
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04-23-2005, 06:56 AM
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Take it in for a "Post Purchase Inspection" - figure about $150 (your results may vary) to find out a lot about your new investment... sort of like getting a physical at 40. :-)
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Dustin Tarditi 1990 Carrerra 4 (for sale - need baby hauler) 1974 911 Targa (sold) Raleigh, NC |
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04-23-2005, 11:28 AM
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Yes it does sound that way. Have the valve covers pulled to find out. I just went through a rebuild due to broken studs, so I hope for your sake that's not it.
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04-23-2005, 11:42 AM
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Sigh...Ok, I will investigate the issue. Dang...Thanks guys!
Mike
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'77 911 3.0 '94 Mustang GT '77 911 (soon be a real live racecar!) |
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04-23-2005, 11:09 PM
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Location: Worcestershire. England
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On my 3.2 I thought the same as you. I thought that knowing my luck it must be serious.
However, the phatt phatt sound turned out to be a leak from the underside of the heat exchanger flange at number 6 cylinder. Because the leak was at the joint of the flange it sounded like it was coming from the cylinder head. Stay positive and I'll keep my fingers crossed for you.
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"Understeer is the sign of the Devil" 1989 911 Carrera Targa (Black) 2001 Jaguar XKR (Silver) |
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04-24-2005, 02:47 AM
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Join Date: Apr 2005
Location: Olympia, WA
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Thanks Mark! I am going to take it down to a decent shop and have them take a look.
Mike
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'77 911 3.0 '94 Mustang GT '77 911 (soon be a real live racecar!) |
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04-24-2005, 02:07 PM
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MazdaSpeed3
1974 Porsche 911 Targa 2.7
