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Vibrations @ 3000rpm 

 

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 Post subject: Vibrations @ 3000rpm
Posted: Tue May 23, 2006 7:28 pm 
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Gday, Well whenever Im on the freewayin my XB and cruise up to about 3000rpm I get a intermittent vibration through the car. I mean it goes "vib....nothing..nothing....vib....nothing..nothing...vib.....nothing..nothing....vib" etc. This only happens at 3000 when im driving. Im tipping its the driveshaft out of balance? Any ideas? I know its not the harmonic Balancer because it vibrated even with the old motor in it. Tyres have been balanced too. What do u think?

 

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Posted: Tue May 23, 2006 7:30 pm 
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could it be a small case of fuel starvation perhaps? do you feel any jerking or is it just a noise?

 

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Posted: Tue May 23, 2006 7:31 pm 
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my ute has this problem, i put new tyres on the back, got the tailshaft balanced and that reduced it, but it's still there.

 

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Posted: Tue May 23, 2006 9:17 pm 
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You say you changed motors yes? remove the rear of the driveshaft from the diff only and rotate 180 degrease. Can almost guarantee it has been refitted with the lighter sides of imbalance matched on the ends. If rotating the rear only improves slightly rotate the front only then by 180 degrease, remember to mark the location on the rear.
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Posted: Tue May 23, 2006 9:22 pm 
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could be the harmonic balancer my eb 1 went and it was a s**t to drive!!!

 

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Posted: Wed May 24, 2006 5:10 pm 
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joolz wrote:
You say you changed motors yes? remove the rear of the driveshaft from the diff only and rotate 180 degrease. Can almost guarantee it has been refitted with the lighter sides of imbalance matched on the ends. If rotating the rear only improves slightly rotate the front only then by 180 degrease, remember to mark the location on the rear.


yeah have changed engine, but it was doing this before the engine swap aswell. When i get a chance Ill get under and have a look

 

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Posted: Wed May 24, 2006 8:27 pm 
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What sort of a vibration is it? a shake like from wheels or a deep buzzing vibration? If its a deep buzzing vibration its likely to be the driveshaft. Check for missing balance weights on both ends of the shaft or any obvious damage like dints or deep scratches. If you have a dial indicator measure the runout in the centre of the shaft as its spun, should be no more than 0.45 mm. If so have it straightened and re-balanced.
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Posted: Wed May 24, 2006 8:36 pm 
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Its not buzzing . Im 99% sure its driveshaft. Will get it checked. Spoke to my mechanic, but he cant fix it for another 2 weeks. :(

 

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Posted: Wed May 24, 2006 10:16 pm 
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I meant buzzing like in a high speed but low frequency vibration. Your mechanic will check the UJ's im sure.
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