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  1. #1
    Join Date
    Nov 2007
    Location
    Near Rockhampton
    Posts
    270

    Default Rebushing Carbys

    I'm slowly restoring one of my Datsun 1600's (1971). I purchased a set of twin carbs for it. They are a copy of the British SU but are made by Hitachi in Japan. Not surprisingly the shafts were quite sloppy in the housings so some refurbishment was required.

    On disassembly it was obvious that the shafts were badly worn. I'm not sure what material the bushes were made from but I suspect it was harder than the brass shafts.

    IMG_1165.jpg

    New shafts are not available and I don't have a mill to make new ones so I decided to machine down the originals from 8mm to 7.5mm and fit undersized bushes.
    The ER32 collet adaptor I made a while back came in handy. I undersized the shaft but left the thread and throttle lever location original size.

    IMG_1170.jpg

    I chose to make the new bushes from Delrin. The car won't see a lot of use so I don't think wear should be an issue this time around.

    IMG_1174.jpg

    Pressed in, still to be trimmed to length and finish reamed.

    IMG_1176.jpg

    Reassembled.


    IMG_1190.jpg

    Still a long way to go on this project but i really did enjoy this part.

    John

  2. #2
    Join Date
    Oct 2011
    Location
    Norwood-ish, Adelaide
    Age
    59
    Posts
    6,540

    Default

    Will the delrin swell (and jam) if it gets fuel on it?

    Michael

  3. #3
    Join Date
    Nov 2007
    Location
    Near Rockhampton
    Posts
    270

    Default

    It seems to be commonly used in this application. There may be different grades for different uses.
    I guess I'll find out soon enough.

    John

  4. #4
    Join Date
    Apr 2012
    Location
    Healesville
    Posts
    2,129

    Default

    [QUOTE=GuzziJohn;1928113 I guess I'll find out soon enough.

    John[/QUOTE]

    A sticking throttle is an exciting experience for sure but you should be ok with delrin according to Dupont, see the table on pg 23.
    http://www2.dupont.com/Plastics/en_U...ign/DELDGe.pdf

    I have seen quite a few carbs with what l thought were plastic throttle shaft bushes, maybe they were/are delrin?

    cheers, shed

  5. #5
    Join Date
    May 2011
    Location
    Murray Bridge S Aust.
    Age
    71
    Posts
    5,942

    Default

    As shed said, you should be alright depending on the grade of Delrin???
    Thanks shed for the link to the Delrin grades.
    Kryn
    To grow old is mandatory, growing up is optional.

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