engine vibration

H

hindsight

Member
Hi all

I am having problems with a vibration from the engine of my series 1 v8.

I have only had the car a couple of months and am slowly going through the faults. Its always had the vibration but i put it down to the engine mounts , which were non existent, and the carbs being well out of balance.

These things however are now sorted and the vibration is still there. I removed the engine fan hoping that it would be out of balance but there was no difference.

The engine runs fine but when you get to about 2500 revs the vibration starts and lessens at higher revs.

It is definitely engine related as it vibrates just when revving the engine.

I am now thinking that it maybe an out of balance torque converter or has the engine got some sort of balancer on the front?

Any ideas ?

Thanks Steve
 
It should have a balance ring on the front pulley, and the torque converter can be out of balance, but you have 4 positions to choose to fit it, so one of the other 3 might cure it, and if not the engine can be run for very short periods with it disconnected to eliminate it as the cause.

That sort of vibration at those approximate rpm seem to be becoming more common for some reason.
 
Hi Harvey

Thanks for the quick reply.

I think I will try the front pully first as I dont really fancy removing the gearbox unless I really have to.

Do you know if the balancer is part of the front pully or separate ?

Thanks
 
Have you checked to see that it is in fact running on all 8 cylinders ? Check all plugs and plug leads, perhaps by disconnecting one at a time and seeing whether it alters the running. If on any cylinder this makes no difference, then after checking all ignition components, first a compression check and then a look at all the valve gear is called for. The V8 has a habit of wearing the rear cam lobes so it is worth seeing whether the valves on the 2 rear cylinders are opening correctly
 
when mine did that on an s1 v8 ( smaller engine mounts!) it was the engine mounts... they looked ok till i lifted the engine and they were sheared. Did you actually replace them?
 
rockdemon said:
when mine did that on an s1 v8 ( smaller engine mounts!) it was the engine mounts... they looked ok till i lifted the engine and they were sheared. Did you actually replace them?
Click to expand...

Hi Rockdemon

yes I replaced the mounts for new ones as the old ones had managed to destroy all the rubber. Those smaller mounts look much too small to do the job don't they !

christopher storey said:
Have you checked to see that it is in fact running on all 8 cylinders ? Check all plugs and plug leads, perhaps by disconnecting one at a time and seeing whether it alters the running. If on any cylinder this makes no difference, then after checking all ignition components, first a compression check and then a look at all the valve gear is called for. The V8 has a habit of wearing the rear cam lobes so it is worth seeing whether the valves on the 2 rear cylinders are opening correctly
Click to expand...

Hi Chris

I have replaced all the electrical bits one at a time, as it were, to see if it made any difference but the vibration stayed the same.. I am quite sure that it is running on all 8 but I haven't managed to do a compression test as my compression tester has broke. I am planing to get one this weekend to test them.


Thanks for the replies. I will keep you updated and fingers crossed it will be something cheap !!

Steve
 
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