Oil plug?
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From: Kingsland, GA
Oil plug? Is the block plug I have circled here an oil plug (it's right above where the oil filter is)? Has anyone ever had one leak? I've been chasing a BAD oil leak for a while now, and I think it might be coming from here. I've changed rear covers/gaskets, rear main seals, and oil pans/gaskets and it still leaks in the same spots. It's hard to tell exactly where. It only leaks when it runs. And it drips down. Drips off rear most driver side oil pan bolt and in between bellhousing and block.
thats a block drain for coolant.
as for the oil leak have you checked the oil sending unit?
it sounds likely as you have elimanated alot.
uv dye in the oil and a black light can help a lot on pita leaks
as for the oil leak have you checked the oil sending unit?
it sounds likely as you have elimanated alot.
uv dye in the oil and a black light can help a lot on pita leaks
Check your rear oil galley plug, right behind the pilot bearing. It looks like a bottle cap/freeze plug. It seals the crank from any oil coming out.
I just bumped the thread.
See post #3:
https://ls1tech.com/forums/manual-tr...-oil-leak.html
http://s56.photobucket.com/albums/g1...t=Clutch51.flv
I just bumped the thread.
See post #3:
https://ls1tech.com/forums/manual-tr...-oil-leak.html
http://s56.photobucket.com/albums/g1...t=Clutch51.flv
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From: Kingsland, GA
Thanks for the replies guys. I have checked all of the before mentioned symptoms. I have cleaned everything off with brake cleaner and searched and hunted. With the tranny out. If it was possible (hell, it might be), I would say that it is leaking out of the driver side rear corner bolt of the oil pan. Then running along the rear of the oil pan and dripping down in between the bellhousing and block.
The reason I "thought" it might be that plug, is because I simulated that plug leaking, and oil dripped almost the exact same way the leak does. But I've been under the car with it running, and I couldn't see any oil coming from that plug.
I'm lost guys. When I say it's a bad leak, I mean after 10 minutes I had a 12" diameter puddle under the car. So needless to say, I want this fixed.
The reason I "thought" it might be that plug, is because I simulated that plug leaking, and oil dripped almost the exact same way the leak does. But I've been under the car with it running, and I couldn't see any oil coming from that plug.
I'm lost guys. When I say it's a bad leak, I mean after 10 minutes I had a 12" diameter puddle under the car. So needless to say, I want this fixed.
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Check your rear oil galley plug, right behind the pilot bearing. It looks like a bottle cap/freeze plug. It seals the crank from any oil coming out.
I just bumped the thread.
See post #3:
https://ls1tech.com/forums/manual-tr...-oil-leak.html
http://s56.photobucket.com/albums/g1...t=Clutch51.flv
I just bumped the thread.
See post #3:
https://ls1tech.com/forums/manual-tr...-oil-leak.html
http://s56.photobucket.com/albums/g1...t=Clutch51.flv
Thanks for the replies guys. I have checked all of the before mentioned symptoms. I have cleaned everything off with brake cleaner and searched and hunted. With the tranny out. If it was possible (hell, it might be), I would say that it is leaking out of the driver side rear corner bolt of the oil pan. Then running along the rear of the oil pan and dripping down in between the bellhousing and block.
The reason I "thought" it might be that plug, is because I simulated that plug leaking, and oil dripped almost the exact same way the leak does. But I've been under the car with it running, and I couldn't see any oil coming from that plug.
I'm lost guys. When I say it's a bad leak, I mean after 10 minutes I had a 12" diameter puddle under the car. So needless to say, I want this fixed.
The reason I "thought" it might be that plug, is because I simulated that plug leaking, and oil dripped almost the exact same way the leak does. But I've been under the car with it running, and I couldn't see any oil coming from that plug.
I'm lost guys. When I say it's a bad leak, I mean after 10 minutes I had a 12" diameter puddle under the car. So needless to say, I want this fixed.
Have you put a little bit of RTV in the gap between the gap of the rear cover and the block, where these 2 meet the oil pan mating surface area. And it doesnt hurt to put some in the front near the front cover as well.
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What about the oil cooler bypass gasket on the side of the oil pan above the oil filter... It is a very common problem and GM has actually changed the gasket from an o-ring style to a steel shim.
Shane
Shane
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Oh, and the leak is definately NOT from the center. Its toward the corner.
Thanks again guys...keep the ideas coming!
Does anyone know if the rear corner oil pan bolt goes through an oil passage?
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I've been chasing an oil leak for the last year. Changed rear main seals, rear cover, and oil pan gasket twice. No luck. Saw your post, did the flourescant die and black light trick, low and behold it was this plug. Oil ran down the pan rail to the rear cover where the flywheel caught it and slung it around everywhere. Could not actually see the oil leaking from the plug with the naked eye (long tubes in the way).
Took the plug out, cleaned her up, put some fresh dope on the threads....NO LEAK!!
(edit) Just realized the date, sorry 'bout resurrecting old thread....
Took the plug out, cleaned her up, put some fresh dope on the threads....NO LEAK!!
(edit) Just realized the date, sorry 'bout resurrecting old thread....
Last edited by 69GMC/99LS1; Apr 15, 2011 at 10:17 AM. Reason: OOPS...OLD thread
Teching In
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Wrong! That's an oil gallery plug he has circled there. 
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