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348 Transmission leak

Discussion in '348/355' started by CrestSpeed, Jan 12, 2019.

  1. CrestSpeed

    CrestSpeed Rookie

    Jul 25, 2015
    12
    Wausau, WI
    Full Name:
    Larry
    Looking for some direction on a small transmission oil leak.
    The oil is weeping from the small plug on the front of the trans.
    See photo (plug is on the lower left side, with a small drop of oil on it).
    It leaks about 5 drops a week. My question is can I remove and clean this plug
    to stop the leak?
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  2. yelcab

    yelcab F1 Veteran
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    Nov 29, 2001
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    Mitchell Le
    Step back a bit and take a bigger picture. I want to know the general direction of the "plug"
     
  3. S-T48

    S-T48 Formula Junior
    Silver Subscribed

    Oct 30, 2008
    500
    Stevenson Ranch, CA
    My guess is the leak is not from the plug, but it makes its way there. You would be surprised how oil travels. Likely its the backplate... I see some residual there...
     
  4. CrestSpeed

    CrestSpeed Rookie

    Jul 25, 2015
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    Larry
  5. Wade

    Wade Two Time F1 World Champ
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    Wade O.
  6. Wade

    Wade Two Time F1 World Champ
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    Or from the top of the motor, e.g. the cam covers.
     
  7. yelcab

    yelcab F1 Veteran
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    Are you sure that stuff is gear oil?
     
  8. CrestSpeed

    CrestSpeed Rookie

    Jul 25, 2015
    12
    Wausau, WI
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    Larry
    Ok, just checked the plug. Yes, the trans oil is weeping out the plug threads. No other signs of oil from anywhere else. I can wipe the plug clean, then wait and the oil reappears. Also the Allen head thread is stripped round. I tried to tighten the plug bit no results.
    Can I just get a new plug and replace this one? Or is this plug holding something in the transmission in place?
    LJS
     
  9. Ferrarium

    Ferrarium Formula 3
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  10. Wade

    Wade Two Time F1 World Champ
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    #10 Wade, Jan 13, 2019
    Last edited: Jan 13, 2019
    Looks to be on the Intermediate Plate, and possibly Item #44

    https://www.ricambiamerica.com/car-diagrams/ferrari/v6-v8/348-group/348/gearbox-differential-housing-and-intermediate-casing.html


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  11. CrestSpeed

    CrestSpeed Rookie

    Jul 25, 2015
    12
    Wausau, WI
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    Larry
    No, it's not the drain plug. I just changed the trans oil then noticed the leak it's from the small plug at the front bottom of the casting. Review first photo.
    Thanks for you input.
    LJS
     
  12. Ferrarium

    Ferrarium Formula 3
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    I'm no expert but if its the bolt Wade posted try torquing then all, but I suspect if its that bolt its probably gasket issue and oil by passing and working it way out the bolt hole. Not sure a new bolt will do anything different. I hope I'm wrong of course. Dig into parts diagrams different ones will have different angles. Should reveal some answers to what it is. May be a simple fix.
     
  13. CrestSpeed

    CrestSpeed Rookie

    Jul 25, 2015
    12
    Wausau, WI
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    Larry
    Yes, that's the plug (10269550 PLUG).
    Can this plug just be removed and replaced with a new one? Will the Trans oil pour out?
    LJS
     
  14. Wade

    Wade Two Time F1 World Champ
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    Mar 31, 2006
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    Since it's already "stripped round" seems that someone made previous attempts to tighten it (or stripped when trying to remove).

    Hopefully someone here will add from their experience - plug removal. From the parts book, there doesn't appear to be any spring-loaded surprises within. ;)
     
  15. CrestSpeed

    CrestSpeed Rookie

    Jul 25, 2015
    12
    Wausau, WI
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    Larry
    Ok, maybe I'll try my Dremel and cut a slot to use a flat screw driver?
     
  16. Wade

    Wade Two Time F1 World Champ
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    I'd try an easy-out first (i.e screw extractor).


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  17. CrestSpeed

    CrestSpeed Rookie

    Jul 25, 2015
    12
    Wausau, WI
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    Larry
    Good plan! I have a set. Any idea if the oil will pour out if I remove the plug?
    Thanks,
    LJS
     
  18. Wade

    Wade Two Time F1 World Champ
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    New territory for me so I don't know. Never seen or heard of anyone pulling this plug before either (not that it hasn't been done, of course).
     
  19. Ferrarium

    Ferrarium Formula 3
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    Jul 28, 2018
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    I think in the diagram for oil pump and what not it shows that plug. I believe I remember seeing it when I was having all my tensioners updated as the pan had to be dropped and I was buying all the replacement rings and what not.
     
  20. CrestSpeed

    CrestSpeed Rookie

    Jul 25, 2015
    12
    Wausau, WI
    Full Name:
    Larry
    Thanks everyone for your direction and help. I was able to use an easy-out to loosen then tighten the plug about 1/2 turn in.
    Hope this works to stop the leak, if not, I'll replace it with a new one.
    LJS
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  21. CrestSpeed

    CrestSpeed Rookie

    Jul 25, 2015
    12
    Wausau, WI
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    Larry
    Under the car tonight. No leaks!!!
     
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  22. Ferrarium

    Ferrarium Formula 3
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    Awesome news keep an eye on it.
     

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