Violent shaking d-90 - Defender Source
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  #1  
Old August 11th, 2011, 07:56 PM
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rob grentz
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Violent shaking d-90

When I hit a bump at about 55mph or greater the front passenger side starts to bounce and shake like crazy (good thing I don't have a baby I'm talking shaken baby kind a shaking) and it is worse or starts at a lessor speed if I'm cornering and hit a bump. any suggestions I'm thinking shocks and springs I had the shocks replaced some time ago and am running on the original springs 126.000 miles and its a 94 d-90 thanks in advance ROB
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  #2  
Old August 11th, 2011, 08:11 PM
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Neill Thornton
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It's called "death wobble" and usually due to one (or a combination) of 3 things:

1) Swivel Ball Bearings shot/wrong preload
2) Wheel Bearings shot/loose
3) Bad Shock with no dampening
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  #3  
Old August 11th, 2011, 08:15 PM
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rob grentz
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DEATH WOBBLE?? now that doesn't sound good? Thanks is there a way/test to determine which death wobble it is?
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  #4  
Old August 11th, 2011, 08:18 PM
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Chris Snyder
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You say it's the front passenger side... Does that mean the steering wheel doesn't vibrate or oscillate at all?
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  #5  
Old August 11th, 2011, 08:23 PM
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rob grentz
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not really the it seems that if I was to look at it while its shaking the front pass wheel would be bouncing in turn bouncing the whole truck there is a slight shaking in the steering wheel as this happens but not like I would think I am able to maintain control till I slow down to about 45/50 and it stops and then I can resume warp speed landrover style
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  #6  
Old August 11th, 2011, 08:26 PM
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Also check tire pressure first. Mine will sometimes do that if the pressure gets low
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Old August 11th, 2011, 08:37 PM
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Quote:
Originally Posted by bar11 View Post
not really the it seems that if I was to look at it while its shaking the front pass wheel would be bouncing in turn bouncing the whole truck there is a slight shaking in the steering wheel as this happens but not like I would think I am able to maintain control till I slow down to about 45/50 and it stops and then I can resume warp speed landrover style
Yup.....

To check the bearings:



That video shows the exact sound and movement... your tire should not be able to move at all or make any clunking noises! Make sure you jack up the tire off the ground first of course.

You might be able to tell between the swivel ball and the wheel bearing if it only clunks up and down and not left to right.
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  #8  
Old August 11th, 2011, 09:09 PM
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Mine had similar symptoms a while back, front poly bushings were shot. I replaced the bushings and haven't had a problem since. Might be worth looking at.
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  #9  
Old August 11th, 2011, 09:45 PM
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Check the tightness of the Pan Hard rod bolts and the condition of the bushings too.
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  #10  
Old August 11th, 2011, 09:56 PM
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Tire pressure is critical most likely its the swivel pins or steeeriomg damper. Depending on your miles it might be time i fought all of this for a while. Rebuilding swivels hubs and front end bushings my 90 handles like an m3
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Old August 11th, 2011, 11:52 PM
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Concur with pretty much all of the above.

Best bet really is to just systematically inspect all the front suspension bushings, steering components, swivel components, bearings, etc.

Remember too that this many times is a cumulative effect of multiple component failures, so even if you find something that's totally hashed..... keep going with the inspection.

Any other symptoms that may go along with it? Does it pull at all to either side, and if so is it all the time or only while braking? Brakes work ok, or do you have to press them a couple times sometimes (particularly after a turn)?

If you haven't done it in a long time, it's never a bad idea to at least re-pack and re-seat the bearings in the front. Just make sure to read up on the procedure, and get the correct hub tool for it. Too loose and it causes odd braking, too tight and it burns the bearings. It's not hard to get it right, just need to be familiar with what to look and feel for as you do it.

-Hans
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  #12  
Old August 12th, 2011, 08:05 AM
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Quote:
Originally Posted by rover4x4 View Post
Tire pressure is critical most likely its the swivel pins or steeeriomg damper.
It's not the steering damper.
Land Rover steering dampers have nothing whatsoever to do with death wobble, that's not their purpose, despite people perpetuating the myth that a new one can be a fix for wonky steering.
A Land Rover with steering components in good shape doesn't even need a steering damper for on tarmac driving.

Causes of wobble are (from easiest to correct):
loose steering box fixings (not so much but can contribute)
loose hub bearings
loose front suspension bushings/bolts (particularly panhard rod)
too light preload on swivel pins.
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  #13  
Old August 12th, 2011, 10:25 AM
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Add tyre failure to the list. The cords in the body of my General TR's failed last year - caused a wobble to end all wobbles. Like the other posts - check everything but my money is on the shock on that side or possibly the mounting turret on an aftermarket one the spot welds can separate and allow the top plate to pull down and it will cause a lot of banking, clanging and general lack of damping on that corner.
Concur with Antichrist on the steering damper.
It won't be the spring though.
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  #14  
Old August 12th, 2011, 10:26 AM
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Agree but they are a nice band aid
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  #15  
Old August 12th, 2011, 11:34 AM
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Joe Still
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Death Wobble

I'm new to Defender but after years with a 95 Disco I can tell you with confidence a new steering box fixed the problem permanently. I went to 150k without anyu other front end repairs other than alinement. js
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  #16  
Old August 12th, 2011, 11:43 AM
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rob grentz
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Thanks guys for all the great info , looks like I gots my work cut out this this week /weekend
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  #17  
Old August 12th, 2011, 12:54 PM
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Prolly the Panhard rod bushings. EZ fix.
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  #18  
Old August 13th, 2011, 03:39 PM
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Adam Hairston
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X3 panhard rod bushings.

To test: have someone gently turn the wheel back and forth while parked. From underneath look at the linkage end for movement that doesn't move what they are attached to. It will make sense when you see it and you will know what to tighten.
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  #19  
Old August 13th, 2011, 03:46 PM
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[QUOTE=Antichrist;295197]It's not the steering damper.
Land Rover steering dampers have nothing whatsoever to do with death wobble, that's not their purpose, despite people perpetuating the myth that a new one can be a fix for wonky steering.
A Land Rover with steering components in good shape doesn't even need a steering damper for on tarmac driving.

QUOTE]

You are right about the damper not being a cause. It is, however, a great benefit to the steering stability of the vehicle on or off road. In addition, as it's name implies it can help absorb steering input shocks that would otherwise be transmitted directly to the driver or steering components.
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  #20  
Old August 13th, 2011, 05:07 PM
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I recently bent/destroyed my steering dampener @ rausch creek and had to unhook it 2 weeks ago. I haven't had a chance to swap it out and have put 1000 miles on the truck. Definately feels different !
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