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Shoebox trans on merc 8cm?

Discussion in 'The Hokey Ass Message Board' started by Dog Dish Deluxe, Sep 10, 2012.

  1. Dog Dish Deluxe
    Joined: Dec 23, 2011
    Posts: 778

    Dog Dish Deluxe
    BANNED
    from MO.

    Somebody on here will know. I'm trying to use a stock shoebox overdrive trans on a merc 8cm block but it acts like the pilot shaft is too big to fit into the clutch. I'm trying to find out if there is a difference in the size or if it's just not fitting in because of surface rust or something.
     
  2. Mike51Merc
    Joined: Dec 5, 2008
    Posts: 3,856

    Mike51Merc
    Member

    Merc block is the same as 8BA Shoebox block. Which components from each are you using? Pilot shaft and clutch have nothing to do with the block, so you must have "mixed and matched" components.
     
  3. Dog Dish Deluxe
    Joined: Dec 23, 2011
    Posts: 778

    Dog Dish Deluxe
    BANNED
    from MO.

    Well, not the actual "block" but the stock merc clutch and everything. The customer brought me everything and the clutch/bell housing is all put together so I'm not sure what hes used in it.
     
  4. Hnstray
    Joined: Aug 23, 2009
    Posts: 11,954

    Hnstray
    ALLIANCE MEMBER
    from Quincy, IL

    Is the clutch disc hub accurately aligned with the pilot bearing? If the disc is not perfectly centered it is damn difficult to get the pilot shaft to enter the pilot bearing/bushing.

    Although it shouldn't be contributing to the problem you ask about, it would be worthwhile to make sure the disc he installed has the correct hub spline for the trans you are using. The Merc input spline is larger than the Ford equivalent. However, if that were the case, I would think your trans slip into place with no difficulty at all.


    Ray
     

  5. Kiwi 4d
    Joined: Sep 16, 2006
    Posts: 2,988

    Kiwi 4d
    ALLIANCE MEMBER

    Just fitted a std early 3 speed to a merc 8cm. I have a ford o/d and a merc o/d here if you would like me take measurements but am pretty sure they are identical.
     
  6. Dog Dish Deluxe
    Joined: Dec 23, 2011
    Posts: 778

    Dog Dish Deluxe
    BANNED
    from MO.

    Im thinking there is rust or old grease in there making it not want to go together right. I'm going to just have to pull it apart and see i guess. Just wanted to make sure about the clutch/spline sizes before I spend the extra time to tear into it further since its for a customer and time is money.
     
  7. paleot
    Joined: Aug 29, 2011
    Posts: 221

    paleot
    Member
    from louisiana

    Dirt dobber wasps have caused many a problem!
     

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