Help - Rebuilding 308 Engine what is this part from? | FerrariChat
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Help - Rebuilding 308 Engine what is this part from?

Discussion in 'Technical Q&A' started by tomoshea, May 13, 2005.

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  1. tomoshea

    tomoshea Formula Junior

    Dec 29, 2003
    541
    Ireland
    Full Name:
    Tom O'Shea
    #1 tomoshea, May 13, 2005
    Last edited by a moderator: Sep 7, 2017
    Hi,

    I am in the process of dismantiling my 308 engine from a 1979 gt4.

    Having pretty much seperated everything at this stage (except the heads - mine are siezed - the luck of the irish - Not!).

    I found the following on the floor of the garage and I have absolutely no idea what it is. I bagged and labelled everything as i removed it from the engine.

    So this has part has fallen out of something my only clue is that it was covered in mucky gearbox oil on the floor (don't know if that is a red herring though?)

    Please see attached photo, it looks like a bearing guide or something. The details are:

    Outside diameter 42.6 mm
    Inside diameter 34.6 mm
    Diameter of the lip 38.8 mm

    The back of the piece looks in the same condition as the fornt except that close to the inside diameter the whole way around the circumference is polished - like it has been rolling on a bearing.

    All thoughts/ suggestions welcomed

    Tom
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  2. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
    Lifetime Rossa

    Jan 11, 2001
    26,931
    30°30'40" N 97°35'41" W (Texas)
    Full Name:
    Steve Magnusson
    #2 Steve Magnusson, May 13, 2005
    Camshaft lip seal? Can you account for all 4?
     
  3. Rifledriver

    Rifledriver Three Time F1 World Champ

    Apr 29, 2004
    37,288
    Cowboy Capitol of the World
    Full Name:
    Brian Crall
    #3 Rifledriver, May 13, 2005
    It is the snap ring retainer from the transmission input shaft. It goes on just before you install the outer support bearing that resides behind the driven gear in the transfer gear stack.
     
  4. jwise

    jwise Formula Junior

    Apr 2, 2003
    781
    Portland Maine
    #4 jwise, May 13, 2005
    Looks like it could be the spacer behind the lower transfer gear/bearing that goes on the input shaft for the transmission. It may have pulled off of the shaft when you removed the bell housing. My experience is with a GTS, but I assume the GT4's have the same set up?

    It fits around a c-clip that is attached to the input shaft. I don't remember the diameter of that shaft- could be around 34 mm.
     
  5. pma1010

    pma1010 F1 Rookie

    Jul 21, 2002
    2,559
    Chicago
    Full Name:
    Philip
    #5 pma1010, May 13, 2005
    Last edited by a moderator: Sep 7, 2017
  6. yelcab

    yelcab F1 World Champ
    Consultant

    Nov 29, 2001
    13,652
    San Carlos, CA
    Full Name:
    Mitchell Le
    #6 yelcab, May 13, 2005
    Please post a pix of the other side,
    Is it metal, or rubber? Looks rubbery from here.
    Is the tranny separated from the engine?
    Did you remove the drive axles flanges?

    Does not look like the retaining ring.
     
  7. Matt Morgan, "Kermit"

    Matt Morgan, "Kermit" Formula Junior

    Nov 12, 2003
    405
    Ferndale, WA
    #7 Matt Morgan, "Kermit", May 13, 2005
    I don't have one handy to verify measurements, but don't toss it, the smart cash bet is on Brian and Phillip!
    Kermit
     
  8. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
    Lifetime Rossa

    Jan 11, 2001
    26,931
    30°30'40" N 97°35'41" W (Texas)
    Full Name:
    Steve Magnusson
    #8 Steve Magnusson, May 13, 2005
    My bad -- didn't realize it was a hard part.
     
  9. tomoshea

    tomoshea Formula Junior

    Dec 29, 2003
    541
    Ireland
    Full Name:
    Tom O'Shea
    #9 tomoshea, May 13, 2005
    Brian & Philip right on the mark I think!, I will check it tomorrow morning and confirm.

    Must have fallen away from the bearing when I took it off and did not notice it!.

    I love this forum, so many people with great knowledge.

    I will post / link to pictures of the full rebuild when I have it completed - witth learning points!

    Expect a few more calls for help/ guidance between now and then :)

    Cheers Guys

    Tom
     

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