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Vibration at 3000 rpm.

Hey,
I have a 253 HZ. when the engine reaches 3000 rpm it starts to vibrate no matter what gear or what speed. The vibration gets even worse when the aircon is on.The vibration go from a soft vibration for 2 sec then hard for 2 sec and them soft again.When I get close to the redline the vibration is still there but nowhere near as bad.

I need any help to fix this problem.I was told that the cam shaft can become unbalance
after a while.

Cheers Sean

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How healty is the harmonic balancer? Does it vibrate like that when you rev it at stand still?

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Check your engine and gearbox mounts as well as your bellhousing to motor bolts.

Other than that, I'd suggest that your problem is internal to the engine and ultimately fatal to the engine...it WILL get worse if it isn't a loose bolt/broken mount...

HTH...Dave

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Cheers...Dave

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Hey,
The harmonic balancer is brand new so is the gearbox(3 weeks old).Is there a place I could go to see if the engine is unbalanced.I will check the mounts
tonight

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My 253 used to do the same thing, im not 100% sure when it stopped, but i think it was after i got my car dyno tuned and runnin properly.

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