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Transmission vibration, 1993 RRC 200 Tdi

My RRC has developed quite a noticeable transmission vibration (I think) and I'm after some advice. The vibration begins at 28 to 30mph. The worst of the vibration was between 30 and 45mph. The garage removed the front propshaft (which was apparently misaligned and worn) and drove the vehicle and the vibration more or less disappeared, so they replaced the propshaft, which all seemed pretty reasonable. The vibration is now still quite noticeable and worst between about 50 and 65mph.

This all started with a bang, which sounded like a stone hitting the underside of the car (on the road, I hasten to add and I was doing

40mph). To start with I thought it was a stone and that the vibration was from a defective wheel (I'd had two fitted the day before) so I took it back to the tyre fitters and they checked the tyres they'd sold me and the part-worn ones they hadn't and said they were all OK. I'm 99 per cent sure this is a mechanical vibration and not a wheel wobble.

I'm not really sure where to go next. When I picked the RR up from the garage that fitted the prop-shaft, I did four miles down the road and then went back because the problem was still there. They told me to do a couple of hundred miles and see if things improved, but I'm losing faith in them a bit, if I'm honest.

I've got a bit invested in the RR so I do want to sort it out, but I'm one of those odd people on this group who doesn't know a diff from a dipswitch :-) so any advice would be very gratefully received. Is it just a question of expensive trial and error until I find something that stops the vibration or is there something more sensible I can do? TIA.

Reply to
Andrew
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Likely to be front or rear prop UJ's .. dunno if your RR has a rubber donut on the rear prop, but they go quite often on my Disco .. ;)

Could be harmonic balancer/damper dropped off! ... large round thing hanging down behind front axle with a bowden cable thing through it.

Wheel bearings, half-shafts, swivel joints, CV joints .. any, all, or some can produce vibrations, so need checking at least to eliminate them ... ;)

Reply to
Paul - xxx

First thing to ask - is this garage familiar with Land Rovers?

Recent front propshafts have a phasing which appears to be wrong to the uninitiated. It's possible that in doing what they thought was the right thing a problem has been introduced! The two ends should be displaced by

45 degrees.

Was the 'stone' a balance weight coming off the propshaft?

You need to be very careful not to change/correct too many things at the same time or you will get totally lost. As you suggest, it could get expensive and unnecessarily so.

Check the propshaft phasing - there should be alignment arrows near the sliding joint BUT the end result should be apparently misaligned ends. If you now have a correct new shaft this should be OK. If it's a re-used one it is also possible to fit the end flanges 180 degrees out and to lose the balance.

You've confirmed the wheel balance - or have you?

Only once you've satisfied yourself about the above should you move on other things - and there are many possibilities but if all was OK before this event you don't want to start looking there, yet.

Reply to
Dougal

Thanks for the responses. The work has been done by a Land Rover specialist, but as I say, I'm not convinced that everything is as it should be. Useful ideas here though, as ever, so I'll see how I get on.

Reply to
Andrew

Which Landrover specialist?

I'll go with Dougal on this one, and I would agree they're not LR initiated.

Reply to
Oily

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