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Triumph 650 crankshaft / 5T crankcase

Discussion in 'Triton' started by steko, Jul 29, 2019.

  1. steko

    steko

    Joined:
    Oct 25, 2018
    Good evening,

    does a E3892/E3906 crankshaft fit to a 5T crankcase?

    cheers
     
  2. Matt Spencer

    Matt Spencer

    Joined:
    Jul 25, 2010
    After 1956 or whateveritwas , you can see a semi circular bulge / raised whelt , for the BIGGER BEARING under the bottom corner of the timing chest .
    However there is , or was , a ' special bearing ' to fit Std Shaft to small bearing case . Timing Side .

    Early Cases shaft & housing , timing side , are smaller .

    ' Big Bearing ' cases run the same bearing Both Sides / Ends of the Crank .

    Ball Races are LESS DRAG , ifya wanna gofast . Tho mightnt last as long .
    Theallowing of whip actually likely prolongs case life , under severe useage .

    [​IMG]
    Big Bearing Case .
    The Casting Dates cast in , on Triumphs . say ' 59 ' or the like .

    This hideously grotty crank , is the preferred ' Thruxton ' lighter snappier revier job , from around 1967 .
    Wernt suitable for plodding old farts so discontinued . Resemble original P.U. Versions .

    [​IMG]

    Canting the injun Fwd reduces vibe transmission .
     

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