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Old 10-13-2011, 09:51 PM   #1 (permalink)
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oil leak

1991 indy sport 440, does anyone have any idea what is leaking here, and how to fix it?
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Old 10-13-2011, 10:15 PM   #2 (permalink)
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Can you repost with a bit more resolution? Some of us don't have the eyes we used to have

Initial thoughts would be the manifold gasket is leaking a bit, allowing oil that is unburned to leak out with the exhaust. That's pretty common. Removing the manifold and installing a new gasket sometimes stops the leak for a few years. You can also try torquing the manifold bolts, sometimes they come loose and allow the leak, too.

It's hard to see, but it may also be coming from the seam between the upper and lower crankcase halves. That's not as common.

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Old 10-13-2011, 11:41 PM   #3 (permalink)
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Thank you. Sorry I didn't realize it was small, here's a better picture. Thanks for the leads I will look into them tomorrow. I'll also get better pictures and maybe that will help. I just don't know anything about engines but I am attempting to fix one.
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Old 10-14-2011, 08:35 AM   #4 (permalink)
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Thanks, much better! It looks like the oil starts just below the exhaust, I would definitely start with replacing the gasket. Good on you for taking on a new challenge! These engines aren't difficult to work on, and there's a bunch of guys here willing to help (or at least stand around and watch you work while we drink a beer! )
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Old 10-18-2011, 09:16 PM   #5 (permalink)
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Do I have to drain the oil before replacing the gasket? You wouldn't happen to know where the drain plug is on this would you? I wanted to see if it starts before I spend time fixing things. It does start, but it wouldn't idle, only staying on when I pushed the gas..why is that?
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Old 10-19-2011, 02:26 AM   #6 (permalink)
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Nevermind, I took it off and noticed that one of the nuts was missing on the y pipe near the leak. Gaskets are crumbling. Going to replace them but then all the oil will go into the pipe rather than down side of engine. That much oil flowing into exhaust has to be something more than a manifold gasket right?
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Old 10-19-2011, 06:17 AM   #7 (permalink)
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Probably looks allot worse than it really is ... A mix of oil sweat , belt dust and a little dirt can make it look pretty bad. I would clean it up and throw on new gaskets or Ultra copper and ride it for a bit before making any judgement .
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Old 10-19-2011, 08:38 AM   #8 (permalink)
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^^good advice

There's a lot of oil that goes into the pipe in a two stroke. That's perfectly normal. Usually, it goes out the end of the exhaust, but in your case, some goes on the side of the engine. And like RXL said, it mixes with all the other stuff under the hood to make it really ugly (it's plenty black as it is, because it's mixed with the carbon and ash from the combustion process.)
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