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Oil Pan Gasket

This is a discussion on Oil Pan Gasket within the General Help forums, part of the LSx Technical Help Section category; Found the source of my minor oil weep after pulling the transmission this afternoon. Looks like the oil pan gasket ...

  1. #1
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    Oil Pan Gasket

    Found the source of my minor oil weep after pulling the transmission this afternoon. Looks like the oil pan gasket is leaking along the back rail. The rear main seal, rear cover plate, and OPSU are all clean and dry. I will be dropping the K-member to swap that out to a UMI tubular unit, so I may as well go ahead and change the pan gasket while I am there. The pan bolts are definitely snug, so that is not the issue.

    Any benefit to attempting the gasket swap with the transmission out versus in? Obviously, the bottom two bell housing bolts need to be out. Not sure about how to safely support the engine except for under the balancer and at each back corner with an undercar stand. If I reinstall the transmission first, I will at least be bolted into the body so I do not have to worry about it rotating or falling completely out. Thoughts?

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    None Shall Pass Knight's Avatar
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    Not sure if it would be possible for you, but I have supported the engine from the top side via chain hoist or cherry picker - with the tranny in. Provides a very solid situation. It also allows total access to everything under the car - as I always seem to place the stands where needed, yet always in my way

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    Forgot to mention -- the car is 6' in the air right now and until I get the trans back in I have no way to lower it.

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    Senior Member JayTA98's Avatar
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    I had this same issue. I replace the gasket and even put the dabs of RTV and I see a leak on the back area of the pan. I remember checking with my fingers above the pan towards the RMS and didn't notice any oil.

    I also heard that if you do the LS6 valley cover conversion can help with oil leaks because it lower the pressure. I might do that next before I give up with these leaks.

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    Senior Member tatertot91's Avatar
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    i got a brand new gm oil pan gasket if you dont have one

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    Quote Originally Posted by tatertot91 View Post
    i got a brand new gm oil pan gasket if you dont have one

    I was going to check with the stealership today. What are they constructed of? It looks like a white/gray plastic type material.

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    Senior Member JayTA98's Avatar
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    Quote Originally Posted by pajeff02 View Post
    I was going to check with the stealership today. What are they constructed of? It looks like a white/gray plastic type material.
    It is made of aluminu, no plastic at all

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    Quote Originally Posted by JayTA98 View Post
    It is made of aluminu, no plastic at all

    If I recall, the LS1 literature states that the oil pan is an integral structure of the engine block. Must be that is why they use an aluminum gasket rather than neoprene. Probably why the darn things leak too...

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    Senior Member JayTA98's Avatar
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    Quote Originally Posted by pajeff02 View Post
    If I recall, the LS1 literature states that the oil pan is an integral structure of the engine block. Must be that is why they use an aluminum gasket rather than neoprene. Probably why the darn things leak too...
    beats me. the inner part of it has a rubber gasket. i just know that I torque everything to specs and it's better than before but is still leaking.

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    Quote Originally Posted by JayTA98 View Post
    beats me. the inner part of it has a rubber gasket. i just know that I torque everything to specs and it's better than before but is still leaking.

    That is not an encouraging sign.

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    LSX whore allbaugh_04's Avatar
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    Mine leaks too, seems like it's going to be a real bitch, that's all i know.

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    engine specs. because of it being a structrual part dont forget to line up the back of the machined part of the oil pan to the flat machined part of the block with a straight edge there should be only twenty thousands gap between the edge of the oil pan and edge of block.

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    Quote Originally Posted by pajeff02 View Post
    That is not an encouraging sign.
    lol im sry but if its not leaking alot i won't do it again. just my 2 cents. you might get lucky!

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    Quote Originally Posted by oldmano2z View Post
    engine specs. because of it being a structrual part dont forget to line up the back of the machined part of the oil pan to the flat machined part of the block with a straight edge there should be only twenty thousands gap between the edge of the oil pan and edge of block.
    I wonder if putting RTV around the gasket when installing will help minimizing future leaks.

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    LSX whore allbaugh_04's Avatar
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    I wonder if slapping RTV on it as is will help

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    Senior Member JayTA98's Avatar
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    Quote Originally Posted by allbaugh_04 View Post
    I wonder if slapping RTV on it as is will help
    I don't think so because it will be more superficial than a thicker coat but give it a try. make sure you clean the area real good.

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    Quote Originally Posted by allbaugh_04 View Post
    I wonder if slapping RTV on it as is will help

    I actually considered this. Clean it really well and go at it with a bead of Ultra Copper RTV or another similar adhesive sealant.

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    LSX whore allbaugh_04's Avatar
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    I've considered it...

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    when you guys say the oil pan is a structural component, you mean it's designed so that the engine can be lifted by the pan?

    also, i wonder if mine is leaking too - damn near every other potential leak point has gotten new gaskets w/in the last six months. wierd thing is the engine seems to be running very well (yes i have new plugs and upstream O2s), and my fuel mileage continues to get better w/ time.. is a slight oil leak ok?

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    The oil pan also provides support for the transmission and has to be properly aligned with the back of the engine block during installation. A leak that drips should be fixed imo. A weep that simply wets the underside of the engine, but does not drip, can be left alone... but must be watched as it will eventually turn into a drip in most cases.

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