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Thread: Mystery nut - mystery to me anyway

  1. #1
    Join Date
    Jul 2014
    Location
    Roswell, GA
    Posts
    54

    Default Mystery nut - mystery to me anyway

    This nut with a winged flange came with my 1936 VLD bit-sa project, the head is 11/16"

    Can anyone tell me what it does, and what the part number is?

    IMG_0490[1257].jpg
    1936 VLD in process
    1969 Honda Z50 K1 perfect!
    1985 Yamaha RZ350 resto-mod
    2006 KTM 950 Adventure
    2019 KTM 300 XCW

  2. #2
    Join Date
    May 2009
    Posts
    138

    Default

    Front motor mount, under the generator, Big Twin.

  3. #3
    Join Date
    Oct 2002
    Posts
    455

    Default

    A special lock washer goes with the bolt.
    AMCA #765

  4. #4
    Join Date
    Aug 2004
    Location
    Beautiful Northern New Mexico
    Posts
    2,762

    Default

    The nut drops into the case from above, the tab keeps it from turning. As stated, the bolt has a special retaining washer so once it is tight the washer is bent up to lock it in place.
    Robbie Knight Amca #2736

  5. #5
    Join Date
    Jul 2014
    Location
    Roswell, GA
    Posts
    54

    Default

    Gentlemen, thank you for the responses!

    Is this nut supposed to fit into a recessed bolt hole in the case? If so, the case was never drilled/machined for it.
    IMG_0496[1283].jpg
    Per the picture, I did insert and tighten the nut, without that retaining washer (I don't have one). If it had a washer [U]under[U]it, the top of the nut would be high enough to contact the generator.
    IMG_0492[1281].jpg
    Here you can see that wear ring, why not just use the same bolt, washer, castle nut with cotter pin as the other 3 holes? The cotter pin might be a trick to get in, but with forceps I'm sure I could manage.
    IMG_0495[1282].jpg
    1936 VLD in process
    1969 Honda Z50 K1 perfect!
    1985 Yamaha RZ350 resto-mod
    2006 KTM 950 Adventure
    2019 KTM 300 XCW

  6. #6
    Join Date
    Aug 2004
    Location
    Beautiful Northern New Mexico
    Posts
    2,762

    Default

    The nut was a new for '36 part and not likely used on a VL, just the new 36 OHV.
    Robbie Knight Amca #2736

  7. #7
    Join Date
    Jul 2006
    Location
    Central Florida
    Posts
    939

    Default

    And the UL beginning in 1937, with no washer. The hole was designed to keep the triangular flange on the nut
    from turning at all.

  8. #8
    Join Date
    Jul 2014
    Location
    Roswell, GA
    Posts
    54

    Default

    Thanks Sarge, now it goes in the spare parts bin
    1936 VLD in process
    1969 Honda Z50 K1 perfect!
    1985 Yamaha RZ350 resto-mod
    2006 KTM 950 Adventure
    2019 KTM 300 XCW

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