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Hints on shift shaft seal

Discussion in 'Technical Q&A' started by Sledge4.2, Feb 4, 2015.

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  1. Sledge4.2

    Sledge4.2 F1 Rookie

    Oct 19, 2007
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    Geno
    #1 Sledge4.2, Feb 4, 2015
    Last edited by a moderator: Sep 7, 2017
    Shift shaft seal leaking on the Lambo. Pulled it, put in new seal, and when putting it back on the shaft I could not get it onto the shaft smoothly. You can see the shaft has a shoulder where the shaft gets thicker, and it was hanging up on that.

    I tapped it a few times, installed it, filled the gear box, came back after a trip and the gear oil all over the floor.

    Pulled the seal housing, and the seal was torn.

    Now, I have a new seal, and I know there is no magic, but any thoughts or techniques on reinstalling would be most welcome.

    Geno
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  2. 2NA

    2NA F1 World Champ
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    Tim Keseluk
    #2 2NA, Feb 4, 2015
    Wrap the shaft with mylar packing tape.

    Lubricate.
     
  3. Sledge4.2

    Sledge4.2 F1 Rookie

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    #3 Sledge4.2, Feb 8, 2015
    that worked, thank you.
     
  4. Jdubbya

    Jdubbya The $10 Trillion Man
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    #4 Jdubbya, Feb 12, 2015
    That's one I need to tackle one of these days on the 308. Little more complicated I think though. Is that right out in the open?
     
  5. Wade

    Wade Three Time F1 World Champ
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    #5 Wade, Feb 14, 2015
    In the middle of doing that right now on my 3.2 Mondial.
     
  6. smg2

    smg2 F1 World Champ
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    #6 smg2, Feb 14, 2015
    On the 308/328 drop both pans, engine and gearbox. Disconnect the clevis joint at the end by the rubber boot. Rotate and pull the shaft back to get to the selector fork. Remove the bolt holding the selector fork on the shaft, don't worry there is a groove for the bolt so it's only going to go back together one way. Remove the fork. loosen the engine mount bolts at the front, i.e. the ones closer to the rear of the car, for some it helps in tilting the engine towards the front, then you can pull the entire shaft out towards the front. R&R the seals and re-install. With a lift and trans jack it should take ~2hrs to do. longer depending on gasket condition what else you may find and if one of the spring balls went flying off..
     
  7. Jdubbya

    Jdubbya The $10 Trillion Man
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    #7 Jdubbya, Feb 17, 2015
    Lift and trans jack being the key words there. I don't have either but I do have jack stands and several floor jacks. ;)
     
  8. wintech

    wintech Karting

    Jun 1, 2011
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    Pete K
    #8 wintech, Feb 18, 2015
    Geno,
    is the seal an o-ring or a lipped seal (like on cam seal)? By the look of it, the threaded portion of the shaft needs covering as any ragged edges can catch and damage the seal.

    I use the electrical shrink tubing on threads through seals as the OD of the thread is generally smaller than the shaft sealing area. To coax the seal over the step, make sure the step is smooth, no nicks in it. Silicone grease or petroleum jelly on the step/shoulder/ covered thread allows it to expand and move, over the shoulder and into the bore. but you have to be gentle, don't force it.

    Hope this helps
    Cheers
    Pete
     

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