civic manual transmission question

Discussion in 'Civic' started by jim beam, May 17, 2010.

  1. jim beam

    jim beam Guest

    if the transmission works noiselessly going forward, but grinds on
    over-run, especially in first and second, is that usually the input
    shaft bearing or one of the others?

    don't usually deal with manuals and would prefer to target replacement
    based on others' experience before stripping it down to inspect.

    thanks much
    jim beam, May 17, 2010
  2. jim beam

    Tegger Guest

    How do you define "over-run"? You mean shifting down to a lower gear?
    Tegger, May 17, 2010
  3. jim beam

    jim beam Guest

    taking your foot off the gas but leaving it in gear - engine braking if
    you like. makes noise thusly in 1st and 2nd.
    jim beam, May 18, 2010
  4. jim beam

    Tegger Guest

    Bearings howl and gears whine. Bearing howl will occur all the time. Gear
    whine will occur only at specific speeds, and/or in specific gears, and
    only when under load.

    I think what you're experiencing may be a clearance problem, probably
    between the exhaust or its heat-shields, and other parts.

    Remember that engine braking on a manual, especially from high-rpm in the
    lower gears, causes the engine to move quite a bit on its mounts. Should
    the exhaust contact the body (or should the shift rods contact the
    exhaust), you'll get some pretty awful noises and vibration. Check
    carefully for shiny spots or other signs of interference on the shift rods,
    the body, and the heat shields.

    Does this thing have a short-shifter, aftermarket exhaust, or other
    modification from stock?
    Tegger, May 18, 2010
  5. jim beam

    jim beam Guest

    but gears can whine when bearings are out, not because the gears
    themselves are a problem. for instance, with helical gears there is
    axial loading. if that causes axial bearing load in the direction of a
    good bearing, all will be good and silent - in the reverse direction
    where the axial load is on a bad bearing, all hell breaks loose.
    exactly what we're experiencing here. i'm trying to figure out which
    one is the likeliest and buy a replacement before removal of an
    otherwise perfectly serviceable transmission that's not giving any metal
    filings on the drain magnet.

    subsequent to my post, i found an article by mistabone on this problem
    and he says it's input shaft closest the flywheel is the commonest
    failure. however, he then goes and ruins it by advocating the use of
    "staking" bearings in place with a punch. really really really not a
    good idea - fatigue crack initiation. if there's a bearing retention
    problem, you should use an appropriate loctite retainer. easy to
    assemble, and local heating makes it easy to disassemble. do NOT punch
    fatigue initiators into your aluminum gear housings you crazy kids!

    yeah, we're looking into that too - it's raining out so i'm not lying on
    my back in that stuff if i don't have to.

    yeah, aftermarket exhaust. i'm going to let the car's owner worry about
    that stuff.

    thanks tegger
    jim beam, May 18, 2010
  6. jim beam

    Tegger Guest

    Yeah, and that's when they howl. I've heard it often enough.

    Check out mechanical interference first. I suspect there's nothing wrong
    with your tranny.
    Tegger, May 18, 2010
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