Vibration.

67Rob said:

There's a vibration from the front end that kicks in at 30mph, disappears, then starts again at 70mph.
It's not vibrating though the steering (have had tracking/balancing done) so, any ideas?

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T26HOM said:

Worn suspension conponants, prop shaft, bushes, tre.

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Datatek said:

Engine type & vehicle would help. UJ's possibly.

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Datatek said:

Also check the torsional vibration damper on the front of the crank, UJ's are the best bet though.

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T26HOM said:

Even with only 12 months on it, I wouldnt rule it out. Is vibration coming through steering wheel? What kind of tyres is it running?

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67Rob said:

Ta, will get both checked.




No vibration through steering. Running Marshall Venture APT's, both brand new (2 months ago) and wearing evenly.

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Datatek said:

If you have new tyres on the front and worn ones on the rear, I'd also check the VCU.

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67Rob said:

What's the VCU?

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Datatek said:

Viscous Coupling Unit, acts as a centre diff lock. Unevenly worn tyres may overwork it causing failure. Jack one front wheel, gearbox in neutral, you should be able to very slowly turn the wheel using a great deal of constant force. If the wheel will not turn, the VCU is seized and it will possible destroy the front diff.

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