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Throwout Bearing/Pilot Bearing Issue Diagnosis

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  • Throwout Bearing/Pilot Bearing Issue Diagnosis

    Over the years I have had two throwout bearings go on me, one with bad consequences because I tried to drive home rather than call AAA. This Saturday I will be helping an acquaintance diagnosis what he believes is a transmission noise that is getting worse. Below is a diagnostic/remedy process I now follow. Feel free to criticize, amend, etc.:

    TRANSMISSION NOISE
    FORD MODEL A


    Symptom: Noise from transmission, effected by clutch pedal movement.

    Clutch Throw Out Bearing Noise: high-pitched rubbing noise with only slight
    pressure on clutch.

    Pilot Bearing Noise: high-pitched noise when clutch is fully depressed.

    Noise When Clutch Pedal Depressed:
    -throwout bearing, worn, damaged, inadequately lubricated
    -pilot bearing (in flywheel) worn, damaged, inadequately lubricated
    -transmission front shaft bearing worn, damaged, inadequately lubricated

    Noise When Clutch Pedal Released:
    -Misalignment of transmission (more noticeable at low road speed)
    -Clutch disk hub loose
    -Clutch disk springs weak or broken
    -Weak or broken throwout bearing sleeve return spring
    -Sticking throwout bearing sleeve (clean slider, lubricate)

    Other deceiving noises that can “travel” include noise from speedometer cable, starter Bendix, generator bearing/bushing, and water pump bearing.

    Firstly, grease the throwout bearing sleeve. If noise is eliminated, good.

    Secondly, if noise still around, adjust the clutch for one inch of free play. If noise is eliminated, good.

    Thirdly, if noise is still present, the transmission will need to be separated from engine. Best to remove rear end and drive train, unless major engine work is required.
    Last edited by BudP; 02-07-2018, 07:10 PM. Reason: spelling error, as usual.

  • #2
    Lookin' good. Somewhere on that list find a place for
    1. disc spring popped out of uncaged disc
    2. worn/damaged roller bearing(s) in tranny

    Comment


    • #3
      Originally posted by BudP View Post
      Noise When Clutch Pedal Depressed:
      -throwout bearing, worn, damaged, inadequately lubricated
      -pilot bearing (in flywheel) worn, damaged, inadequately lubricated
      -transmission front shaft bearing worn, damaged, inadequately lubricated

      Lets see
      With the clutch pedal Depressed the trans input shaft bearing should not be spinning. With the clutch pedal released the input shaft bearing will be spinning
      4~ Tudor's
      1~ Coupe

      Henry Ford said,
      "It's all nuts and bolts"


      Mitch's Auto Service ctr

      Comment


      • Mitch
        Mitch commented
        Editing a comment
        With the input shaft spinning the cluster gear is rotating. The cluster gears have roller bearings on the ends, and the input shaft has roller bearings where it mates to the main shaft. All of these come into play for noises.

        Bud i like this list idea. It would be a good addition to the powertrain tech thread forum. I don't think we have a transmission thread in there yet.

    • #4
      Yup-it's been a few years since I've had to deal with a noisy trans. I'll wait until Saturday when I get my hands into a trans, and then I will rewrite this to account for your and TBird's comments, plus any others I may receive. I do like the idea of written protocols for diagnosis and correction so I'll take another stab at this over the weekend. All comments, suggestions, criticisms welcome.

      Comment


      • tbirdtbird
        tbirdtbird commented
        Editing a comment
        caution on replacing the roller bearings, there are badly made ones and well made ones. The bad ones do not have axles that go all the way through, just dimples on the end plates to hold the rollers in place

      • BNCHIEF
        BNCHIEF commented
        Editing a comment
        To follow onto Tbirds post pics of the poorly made bearings as well as the good bearings and why as well as sources for the good parts. Good list you have started there Bud.

    • #5
      Bud when you get the list revised, we can post it in the tech area. Nice job and thanks for starting this
      4~ Tudor's
      1~ Coupe

      Henry Ford said,
      "It's all nuts and bolts"


      Mitch's Auto Service ctr

      Comment


      • #6
        I am Bud’s acquaintance, and just got everything buttoned back up today. Now NOISELESS throwout bearing. Thanks, Bud!

        Comment


        • Mitch
          Mitch commented
          Editing a comment
          You're in good hands with Bud

          Thanks for the update and glad it's resolved

        • BudP
          BudP commented
          Editing a comment
          So glad you got it done, Jeff-and with your young son learning as he helped you! He will always have this memory!

      • #7
        I’m going thru the same thing now and have been for months. The problem was diagnosed and is being fixed by a mutual friend. This is sort of the second time around. The guy that put the new clutch disc, throw out bearing, and pilot bushing forgot or didn’t know the bearing must be packed before putting it in. Know your mechanic!

        Comment


        • Mitch
          Mitch commented
          Editing a comment
          The replacement bearings are sealed, and do not need packing or servicing. I only use a good quality federal mogul or like.

      • #8
        I should have said this is not a Ford

        Comment


        • #9
          dont forget to dial in your flywheel housing,crankshaft to transmission main shaft alignment is critical.
          You do not have permission to view this gallery.
          This gallery has 1 photos.

          Comment

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