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Old 06-07-2006, 07:01 AM   #1
topdog96
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Smile Oil Leaks

I have a C4 LT1 convertible with 20,000 miles. It has an oil leak that leaves a couple of spots on the garage floor when sitting over night. I understand that this is common for LT1 engines. Does anyine know where the leak starts. Top of engine is clean around intake and valve covers.. P.S. this car is only driven from June to September and then stored
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Old 06-07-2006, 10:20 PM   #2
The Torch
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That would be like guessing how many leaves on a tree. There are too many place to guesss effectively. Front, Back, left , right. top, bottom.front bottom, front bottom right, front bottom left, etc. Clean it completely and just start watching
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RACING...Because with baseball, football, basketball, tennis, and golf, you only need one ball

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Old 06-09-2006, 09:23 PM   #3
mrnuke
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A buddy of mine who's a GM mechanic told me when I asked about the same thing (although mine doesn't leave any drips, just oil coating on the underside of the engine.), he said somehow the LT1s leak all over the place as they are all running Syntech fro mfactory, which finds the holes easily.

Until you notice you are down on oil before an oil change is due (at 3k miles), and do NOT race the car (extended revs on the LT1s pushes oil past the rings, which is 'acceptable) you don't have to worry.
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Stock '92 Triple White rare beauty.
Old 06-16-2006, 12:43 PM   #4
6StringFling
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Cool

Yep, my 95 with 89,000 miles on it leaks as well, I'm thinking its the rear manifold area, (hard to see a thing without a lift), whats really impressive is to be sitting still at a light etc and seeing the smoke rise from under the hood!! but after the initital warmup it burns off and dissipates....I called a Corvette shop and they said $350 to fix the leak, if in fact its the rear corner of the intake thats leaking.....I also appreciate the guy that sold it to me mentioning it leaked.....NOT!
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6StringFling
1995 stock torch red coupe
Old 06-17-2006, 07:58 PM   #5
1996c4
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I have a 1996 LT4 that leaked oil from the intake manifold for the first few years. The leaks were VERY hard to find because so little oil came out, but, eventually, the leaks would find their way down and end up, just as in your case, as a few drops on the garage floor a day or two later. I had two leaks, one in the front, near the passenger side head, and one in the back. The leaks were found only after cleaning all oil from the engine and looking, with a flashlight, in the suspect areas several times after it was run. I figured this had to be the problem after I read a Chevy service bulletin (77-61-17) in the back of the C4 Corvette Specs book by Mike Antonick. The leak was said to be at the "china wall" between the intake manifold and block.
I had a mechanic pull the manifold and use the RTV bonding recommended in the bulletin, but it still leaked. He then recommended we use a different type of black sealant he liked, we did, and ever since it has not leaked a SINGLE drop.
Check this out, I bet its your problem. Good luck. Patrick, 1996c4
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Old 06-17-2006, 10:01 PM   #6
The Bad
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The 94 I used to have started leaking at the frt/rear manifold, sealed that up.
2 weeks later, rear main, sealed that up.
2 weeks later, timing chain cover and oil pan, sealed that up.
1 week later, timming chain cover again, sealed that up.
About a month later, it was time for the trans to start.
The box that the speedo cable goes into, torq converter, and the rear seal were all leaking.
Mind you, the car didn't start leaking untill about a month after I started driving it daily. I thought I found a nice, low mileage vette, but apparently lack of use dried up all the seals. The vette had 66k mi. in 02 when I bought it, thats 8250mi a year.
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2002 Electron Blue Z06: Custom made partition, new stereo system, 5% tint, twin cone air intake system, shorty antenna, Exide Orbital battery, and chrome rims. -Brandon-

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Old 06-19-2006, 02:56 PM   #7
storages
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Quote:
Originally Posted by topdog96
I have a C4 LT1 convertible with 20,000 miles. It has an oil leak that leaves a couple of spots on the garage floor when sitting over night. I understand that this is common for LT1 engines. Does anyine know where the leak starts. Top of engine is clean around intake and valve covers.. P.S. this car is only driven from June to September and then stored
My '84 leaks a few drops a week from the oil pan gasket seal. It's been doing this for years now. It hasn't gotten any worse or any better. It just seems to remain the same. As much as I like everything to be perfect, I live with it because I figure that with my luck, if I try to fix it, I may make it worse. Since mine is such a small leak like yours, I wouldn't worry about it. Just keep an eye on it.
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