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  1. 01-25-2016, 05:24 PM #1
    Zimbos
    Zimbos is offline Low Range
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    Default Rear main seal

    I'm a little discouraged today. I got a quote for replacing the rear main on my new 79 series 3 ,88 inch . It was over 2k by someone who is familiar with series. Is this normal maybe not sure need advice , Gareth,Dallas. Thank you
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  2. 01-25-2016, 07:11 PM #2
    offshoretitan
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    If the Series 3 is new to you and you don't know how much it's been driven of late prior to your acquisition, you might try some seal softener first. If it's just a little hard from sitting and dripping a bit, some seal softener might just take care of your problem. There are clearly different opinions about these products but I've used them in a 1960 and a 1965 Cadillac (both of which had been sitting for a good while) and seen substantial improvement. I've also heard that synthetic oils have a better performance in weak seals than traditional oils but I have no personal experience with that as both cases I'm referring to were quite a while ago. You need to drive your car several hundred miles before the seal softener can have an effect... Bottom line - $10 worth of seal softener or $50 worth of a synthetic oil change might be worth a try. Hope that helps some.
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  3. 01-25-2016, 07:24 PM #3
    Zimbos
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    Thank you. I was being used on a ranch but at very low speeds, I've been on the road with it around 40mph it's leaking pretty bad ,I'll try the sealer
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  4. 01-25-2016, 08:29 PM #4
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    lumpydog
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    I'll be interested to hear how the softener works.

    Other thing to consider: Crank case pressure. Sometimes people will mess with the emissions equipment - remove it. Done carelessly, it leaves the crank case with no way to vent or neutralize pressure. Do you have a connected PCV valve?

    Other sources of pressure include worn rings, allowing blow-by - what's your compression for each cylinder?
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  5. 01-25-2016, 09:01 PM #5
    Zimbos
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    It's venting good ill check compression tomorrow thanks
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  6. 01-26-2016, 11:53 AM #6
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    o2batsea
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    The engine must come out. This is a pretty big deal.

    Name: Rear Main.jpg Views: 1761 Size: 177.0 KB
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  7. 03-30-2016, 06:36 AM #7
    Zimbos
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    Thanks guys it's been 250 miles since I put the sealer in and it has not changed.im thinking of finding another 2.5 and having it rebuilt something to learn from.
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  8. 03-30-2016, 08:26 AM #8
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    lumpydog
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    What did you try for sealer?
    1968 Series IIa
    1997 Defender SW (Original Owner - Sold)
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