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Petrovich · Joined: 27 Sep 2005 Posts: 235 Location: Rockville, MD

It drips oil when running, and it actually makes smoke while doing so. What are the most common things to leak oil around the exhaust manifold/oil filter? The filter is on tight and I'm pretty sure the leak was there before - there's a crust of gunk covering the exhaust pipe.
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1982 924 Turbo, now Lemon

Rasta Monsta · Joined: 12 Jul 2006 Posts: 11733 Location: PacNW

Valve cover gasket, or filler cap gasket?
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Toofah King Bad

WeiBe (1987 924S 2.5t) - 931 S3

Petrovich · Joined: 27 Sep 2005 Posts: 235 Location: Rockville, MD

No, it's under the manifold, I saw fresh oil around the oil filter. There's some hose that runs next to the oil filter, could that be the case?
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1982 924 Turbo, now Lemon

emoore924 · Joined: 13 Apr 2004 Posts: 2822

There's an oil passage that runs between the head and the block right above the oil filter mount. It is often the cause of alleged oil filter leaks but it is really a head gasket that has failed in this area. Be sure to check *carefully* where the oil is coming from and if it is above the filter mount and below the manifold, be sure to carefully check the seam between the head and block.

Petrovich · Joined: 27 Sep 2005 Posts: 235 Location: Rockville, MD

Ohh crap you just made my day

I'll check it on the weekend. If that thing needs a head gasket, I might as well mothball it till spring.
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1982 924 Turbo, now Lemon

endwrench · Joined: 07 Dec 2002 Posts: 1631 Location: Victor, Montana

Excuse my ignorance on the workings of 931's but isn't there an oil filter adapter and some oil cooler lines in that same area of concern?

Todd
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'79 924NA. Rebuilt 9.5:1, MSDS header, Mega Squirt Injection, MJLJ-EDIS Ignition, 1.6L Whipple Charger and Intercooler, 10lbs Boost, 944 Trans, Custom HD Clutch.
"simsport" said....superchargers are better than turbos its official!....

tuurbo · Posted: Thu Dec 13, 2007 7:34 am Post subject:

I've had people replace the filter and not tighten it properly - believe it or not.

Tigger937 · Posted: Thu Dec 13, 2007 9:49 am Post subject:

Another possibility: There's an "O-ring" between the oil filter mounting plate and the block that "flattens" out over time and begins to leak. Replace the "O-ring". Don't know that it would necessarily cause smoking though.

Could also be the "O-ring" in the turbo oil feed line. That is a very special high temperature "O-ring" that is made of viton (I think that's the name of it). Anyway, it's green colored and still available from Porsche for approx. $4. It usually gets incorrectly replaced by an "O-ring" of standard composition and therefore doesn't last very long. A leak there could cause smoking as the oil would tend to leak on the hot turbine and exhaust pipe.
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1981 931 (Concours)
1982 931 (Daily Driver)

"Think outside the box"

Buwani 931 · Joined: 31 May 2004 Posts: 308 Location: Napa California

Petrovich · Joined: 27 Sep 2005 Posts: 235 Location: Rockville, MD

Thank you all for the replies! I'll check those points. Hopefully it's me being dumb and leaving the filter loose or something trivial like that.
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1982 924 Turbo, now Lemon

macBdog · Posted: Fri Dec 14, 2007 2:03 pm Post subject:

Turbo oil supply would be my first port of call. I had a hairline crack in mine so the car would smoke badly on hard left turns only.
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1979 931 with a 350 chev
1973 911E with EFI

Rasta Monsta · Joined: 12 Jul 2006 Posts: 11733 Location: PacNW

Petrovich · Joined: 27 Sep 2005 Posts: 235 Location: Rockville, MD

I'm a dumbass.

Rasta was right the first time, a flashlight to the back of the head revealed a squished, cracked gasket and the oil equivalent of Niagra Falls. Oil then leaked down and around all the stuff, making it look like the whole car leaks under the exhaust manifold.

Of course, that doesn't mean that my other stuff doesn't leak, but at least I should stop smoking like a locomotive.

Wanted to fix it yesterday, but, alas, auto stores are closed on christmas

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1982 924 Turbo, now Lemon