#@%&!* REAR MAIN SEAL

Discussion in 'Fox 5.0 Mustang Tech' started by ss93cobra, May 26, 2005.


  1. ss93cobra

    ss93cobra Founding Member

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    Hey everyone. here's one for you. Stock 88 block, Ford Racing stock spec. crankshaft, main caps, etc. The rear seal starts to leak after @ 15 minutes of idling. Motor was just put back together as well. Oil pressure of 60 at an idle, 80 at 2,000 rpm. Yeah, a little high but I doubt its the culprit here. Running a breather, no blowby, using a pcv and that's it. After it gets good and hot, the rear seal starts to leak. Both seals used were from Ford Racing and Ford and both leaked after @ 15 minutes of running. Seems to be coming from the exterior edge of the seal, not seal to crank. Nice steady drip. Seal installer was used as well. Even squirted some silicone on the edges when the second one was installed. Block was inspected for a nick or scratch as well. It's :bang: :bang: Any thoughts? Anybody have a part # for a seal with a slightly larger o.d. ?
     
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  2. tunedin302

    tunedin302 I AM the law!!!

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    Fel-pro teflon seal and silicone - no leaks. Does your crank need to be sleeved?
     
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  3. ss93cobra

    ss93cobra Founding Member

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    Have you got a # for the Felpro seal? The crank is brand new as well and better not need sleeved. Plus, the leak appears to be coming from the outside edge of the seal, not the inside.
     
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  4. tunedin302

    tunedin302 I AM the law!!!

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    Summit racing

    Teflon seal
    Part# FPP-2941
    Price: $37.99
     
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  5. ss93cobra

    ss93cobra Founding Member

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    :hail2: Thanks! Keep your fingers crossed. BTW, I forgot to mention it's a 306 with a Vortech 12-14lb pulley on her with Roush 200 heads and an Anderson cam. It shouldn't matter though since it's never seen boost yet, all was at idle or slightly above idle.
     
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  6. tunedin302

    tunedin302 I AM the law!!!

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    You probably already know this ... but put the silicone on the block/seal and then let it sit overnight before starting to ensure a good seal. Rick91gt is the guru of this stuff ... thanks to him my rear main no longer leaks :nice:
     
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  7. HISSIN50

    HISSIN50 "How long does it take to get help in here? SN Certified Technician

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    Autozone here sells the Fel-Pro teflon RMS's for 20 bucks.

    good luck.
     
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  8. Ranchero5.0

    Ranchero5.0 The Voice of Reason

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    Also during assembly did you put a dab of RTV between the rear cap and the block? May be leaking from between the mating surface.

    Jamie
     
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  9. DMAN302

    DMAN302 My mom says thanks for the pearl necklace.

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    I hear you, I really do..245 miles on the mill..just a baby, and what do I find on the tranny back plate..a drop of oil..where from...the rear main, yup a leak. I have chosen to ride it out untill winter when I pull the tranny for a rebuild..however my car only sees about 2-3 hundred miles a month. Good luck no matter what you decide to do.
     
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  10. ss93cobra

    ss93cobra Founding Member

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    New seal's in, not a sign of a leak yet! Keep your fingers crossed! :banana:
     
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  11. Stang8URMPRT

    Stang8URMPRT Banned

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  12. Rick 91GT

    Rick 91GT SN Certified Technician Site Sponsor

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    ;)
     
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  13. ss93cobra

    ss93cobra Founding Member

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    :banana: :cheers:
     
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  14. tunedin302

    tunedin302 I AM the law!!!

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