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Gearbox test

  • 19-01-2010 9:22am
    #1
    cantdecide
    Registered Users, Registered Users 2 Posts: 11,465 ✭✭✭✭


    Imagine you’d had a Ducato gearbox reconditioned and you were still hearing bearing type noises/ chatter.

    Imagine if your gearbox guy had reported thrust bearing wear manifested by a forward and back motion on the flywheel/ crank. Imagine he then blamed all of the noise/ chatter on this wear but you didn’t think it were so.

    Imagine if you got the second opinion of your regular mechanic who performed a test on the gearbox to confirm that the noise was there and not elsewhere. What if he drove the van down a gentle slope at maybe 20-30km/h and switched the engine off. What if the noise was still there when the engine was switched off and the van was in gear (with or without the clutch pressed)?

    Surely that tells you it must be the gearbox, right?


Comments

  • #2
    galwaytt
    Registered Users, Registered Users 2 Posts: 12,822 ✭✭✭✭galwaytt


    cantdecide wrote: »
    Imagine you’d had a Ducato gearbox reconditioned and you were still hearing bearing type noises/ chatter..........
    Surely that tells you it must be the gearbox, right?

    two things spring to mind: who put a Ducato gearbox in my Porsche, and.......you're boards.ie name is perfect ! :D:D


    :p:p

    Ode To The Motorist

    “And my existence, while grotesque and incomprehensible to you, generates funds to the exchequer. You don't want to acknowledge that as truth because, deep down in places you don't talk about at the Green Party, you want me on that road, you need me on that road. We use words like freedom, enjoyment, sport and community. We use these words as the backbone of a life spent instilling those values in our families and loved ones. You use them as a punch line. I have neither the time nor the inclination to explain myself to a man who rises and sleeps under the tax revenue and the very freedom to spend it that I provide, and then questions the manner in which I provide it. I would rather you just said "thank you" and went on your way. Otherwise I suggest you pick up a bus pass and get the ********* ********* off the road” 



  • #3
    peasant
    Registered Users, Registered Users 2 Posts: 17,819 ✭✭✭✭peasant


    with the engine off (and hence the flywheel not turning) the only way the van can roll down a hill is in neutral.

    so any noises have to come from the gearbox ...or the brakes, the CV joints, the wheel bearings


  • #4
    galwaytt
    Registered Users, Registered Users 2 Posts: 12,822 ✭✭✭✭galwaytt


    cantdecide wrote: »
    ...Surely that tells you it must be the gearbox, right?

    hold, going down a hill, engine off, IN GEAR........don't think so...engine braking would stop you in your tracks....

    I think you mean going down a hill, in neutral, engine off, with & without the clutch pressed, in which case.............actually, no....

    Engine off, IN GEAR, (ignoring it trying to stop you, for a minute..)...your crank would still turn, so any crank/flywheel noise could still be the culprit.

    Engine off, IN NEUTRAL, clutch pedal pressed, would send you in the direction of the gearbox.....

    Engine off, IN NEUTRAL, clutch pedal NOT pressed, would merely might add clutch/DMF to the potential gearbox issue.

    But there again, it's very early in the a.m......

    Ode To The Motorist

    “And my existence, while grotesque and incomprehensible to you, generates funds to the exchequer. You don't want to acknowledge that as truth because, deep down in places you don't talk about at the Green Party, you want me on that road, you need me on that road. We use words like freedom, enjoyment, sport and community. We use these words as the backbone of a life spent instilling those values in our families and loved ones. You use them as a punch line. I have neither the time nor the inclination to explain myself to a man who rises and sleeps under the tax revenue and the very freedom to spend it that I provide, and then questions the manner in which I provide it. I would rather you just said "thank you" and went on your way. Otherwise I suggest you pick up a bus pass and get the ********* ********* off the road” 



  • #5
    cantdecide
    Registered Users, Registered Users 2 Posts: 11,465 ✭✭✭✭cantdecide


    I mean you can hear noise when

    a) trundling down the hill with the clutch pressed, selecting various gears.

    b) with the clutch out, in neutral

    It's not a DMF, btw and it had a brand new clutch kit into the deal.


  • #6
    Matt Simis
    Registered Users, Registered Users 2 Posts: 8,718 ✭✭✭Matt Simis


    Did you ever look up "gear lash"? Its a horrible noise thats in virtually all gear boxes that you generally only hear if you switch to a lightweight flywheel or your original original FW was heat damaged (like mine) via a burnt clutch.

    Gear Lash makes your car sound like a diesel tractor.
    You can hear it idling in neutral with the clutch out (push it in and you engage the FW and noise goes away) and also in whatever gear on your car is a 1:1 ratio (ie 5th).

    The noise is generally always there (gearbox and driveline noise) but is canceled out by a (balanced) FW via harmonisation. Its well documented in the US and online, but virtually no mechanic here believes me. I solved (masked really) this issue on my own car by putting in a heavier weight (Redline MT-90) Gearbox Oil, the thicker oil naturally deadens the 'boxes noise and as its fully synth and generally really good doesnt negatively affect cold start shifting etc.

    Even when I brought the car back to the mechanic and he commented "wow the gearbox noise is gone, how?" he still didnt quite believe me!


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