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harsh vibration after timing gear swap 120-130

posted by  TomTom on  Mon Jun 13 02:23 CST 2005
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last visit: Wed Jul 7 03:36 CST 2010
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This is following on from the 'hillbilly' post below.

I had the fibre gear swapped recently. At high speeds there is a vibration which I can feel going right into my back. It's not terribly loud, but the general noise at these speeds (60-70) has gone up, whether it's 4th or overdrive. But the vibration is definitely there.

Is this the same problem, or is there something else that may not have been put back right? There is also a whine for about 5 minutes when starting from cold, which goes up in pitch with the engine revs. I've checked the little fins on the alternator and they aren't fouling against anything. I'd appreciate any ideas for either of these questions. Thanks

Tom








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    harsh vibration after timing gear swap 120-130

    posted by  uniberp on  Mon Jun 13 03:09 CST 2005
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    last visit: Mon Jan 31 07:08 CST 2011
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    The vibration is probably from the drivetrain, not the engine. Probably a bad u-joint. If it were engine you'd feel it at a certain RPM, not road speed.

    The whining is probably okay. Did you lean the oil spray nozzle fo the cam gears; were the old gears getting oiled okay? It may whine for a bit, then settle down.
    --
    MPergiel, Elmhurst, IL '74 145e T-5 'Orange Alert'








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      harsh vibration after timing gear swap 120-130

      posted by  TomTom on  Mon Jun 13 04:13 CST 2005
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      last visit: Wed Jul 7 03:36 CST 2010
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      Just to clarify: the vibration is linked with RPM (and consequently with speed). I only mentioned the speed because I compared the old noise at a given speed with the new noise. I used the example of 4th gear because that's the gear when I am travelling for long periods at high speed; I'd say the vibration is felt at above 50 in 4th. Around town it's difficult to tell.

      Tom








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        harsh vibration after timing gear swap 120-130

        posted by  uniberp on  Mon Jun 13 09:24 CST 2005
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        last visit: Mon Jan 31 07:08 CST 2011
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        There are minute differences in the timing between gearsets, so the new gear may have result in slighly different running properties than the old. The advice I took was to get a degree wheel and dial indicator and test for the actual opening, .005 lift and other valve motion, and use a stepped woodruff key to "dial" it in exactly.

        This is not to say your new timing is wrong, but it may be different than your old cam timing and run slightly differently. Different engines have different harmonics.
        --
        MPergiel, Elmhurst, IL '74 145e T-5 'Orange Alert'







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