Small mistake - Big damage

Discussion in 'Motorbike Technical Discussion' started by OH-, Oct 20, 2004.

  1. OH-

    OH- Guest

    Hi, for once a tale and no question.

    A work mate had a Honda XL350 -84 brake down last year.
    Being busy with other things, it has taken him a year to
    dismantle the engine but last week he brought the oil pump
    to work and we had an opportunity to do the post mortem

    The inner rotor part was mangled and split in two, the outer
    rotor was mangled and a part of it broken off and the oil
    pump housing was cracked. In between the rotor parts
    there was a small bit of wire.

    As far as we can reconstruct events all this started with
    a previous ham fisted owner who stripped the oil drain
    hole threads.
    The little wire piece looked familiar, the only thing with
    that shape and profile is the little straight bit on a helicoil
    insert. Probably the previous owner installed the insert
    but did not brake off and remove this bit, instead it was
    broken off by the oil plug, then lay at the bottom of the
    engine until one day it decided to take a ride in the
    lubrication system. A bad idea.

    As far as has been seen yet, the cylinder is scarred, the
    piston is totalled, both ends of the con rod are toast and
    the condition of the crank bearings is dubious. The bike
    is not worth the repair cost and effort and will probably be
    broken for spares.

    Even small jobs deserve attention.
    OH-, Oct 20, 2004
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  2. OH-

    The Family Guest

    Hmmmm!!, I don't think so.

    The Family, Oct 20, 2004
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  3. OH-

    Tealc Guest

    i remember the lad in our motorcycle club in Gilfach south Wales UK
    some one told him his royal enfield 250 cc would be easier to start if he
    drilled a hole in the top of the piston to ease the compression!!!!!!!!111

    he later took the flywheel "pads" of a francis Barnett 250 twostroke twin
    "to allow it to rev freer

    In the same club we used to have reliability trials and Steve used to enter
    several classes by taking various spark plug leads off his Ariel Square
    four to enter the 250(three off) 500 (two off) 750(one off) and 1000(all
    Tealc, Oct 21, 2004
  4. Didja ever see an engine where the owner had attempted to split the casings
    ....with a hammer and cold chisel ?
    Rob Kleinschmidt, Oct 21, 2004
  5. I always used to use cheapo grinding wheels for that kind of stuff.
    Everybody knows cold chisels are for unscrewing recalcitrant nuts.
    Well everybody but this guy anyway.

    For some reason this guy thought he should try to "split" the casings
    without removing any of the bolts holding them together. Not very pretty.
    Rob Kleinschmidt, Oct 22, 2004
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