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Thread: what to do? rear main seal leak on daily driver

  1. #1
    Member JUNIOR BUILDER
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    what to do? rear main seal leak on daily driver

    So my 1994 GMC 1500 v6 has a rear main seal leak as well as the valve covers a little. Its got 195000 miles on it. I don't know if I should go ahead and just get these leaks taken care of? Or maybe have the whole engine gone over and rebuilt? Perhaps just find a new engine? Or even I guess just find another vehicle? What does anyone think?

  2. #2
    Senior Member MASTER BUILDER
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    It all depends on what you want to do. If the body and driveline are in good condition and the cash for another vehicle is tight, a rebuilt motor might be the way to go. At the miles you're talking about, all the mechanical components are close to being needed to be replaced/rebuilt. Just sit down and get prices on the different scenario's you've said and do your homework.

  3. #3
    Senior Member RACING JUNKIE DirkaDirka's Avatar
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    With that many miles on it it might be best to either replace or have the engine rebuilt.
    Its all fun and games till someone loses a nut!

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  4. #4
    Moderator RACING JUNKIE Harbone's Avatar
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    How bad is the rear main leaking? seepage, constant drip or gushing out?
    Chris

    As close to "Normal" as I can get...

  5. #5
    Member JUNIOR BUILDER
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    seems like it's just a seep that really only happens when the oil is hot.. I never notice that it's leaked on the short just up the street kind of trips. I see it when the trips start getting over like 15 minutes.

  6. #6
    Moderator RACING JUNKIE Harbone's Avatar
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    That motor is notorious for a rear seal seep. I have a delivery van thats got 330K miles on it and that seal has been seeping since 100K. its never got past that and has never been low on oil between changes. If its just a seep, keep an eye on it and keep driving.
    Chris

    As close to "Normal" as I can get...

  7. #7
    Member JUNIOR BUILDER
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    Well this morning I changed the oil, that's when I noticed the leak, it was down to the add level. But its only been 2000 miles since the last oil change. So I took it to the place I used to get service before I started doing it myself. They put it up on the lift to get a better view and looked at it for me for free, and confirmed the rear main seal and valve cover leaks.

  8. #8
    With a lot of miles on the engine it may be a bad seal, but something a lot of people don't realize is that you need to pull a vacuum on the crank case or it will find a way to release the pressure, and the rear main is usually the weakest point of release. Check your PCV valve, or better yet, install a new one and make sure you have it on a good strong vacuum source. I've corrected dripping rear mains with this method.

  9. #9
    Senior Member RACING JUNKIE
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    I wouldn't worry about oil consumption less than one quart per thousand miles, with almost 200k....drive & enjoy.....one quart in 2k is nothing for an engine that age & milage. jmo
    MIKE

  10. #10
    Senior Member RACING JUNKIE TheYellaBrick's Avatar
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    I've a 94 Astro with that 4.3 at 220k and it's seeping at that rear main and valve covers. I've cinched down the VC's and am living w/the main seal. My main prob is a burnt valve on #5 ex. The rest of the cyls are 125lbs straight across and it doesn't burn a drop. I'd still be driving it except for that dead hole. Even on 5 cyls I can still tow a loaded trailer without too much grunting!

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