Disco suffering from tankslappers...

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lerk

New Member
Posts
1,763
Location
Creswell, Derbyshire UK
Just been to cast my eye over a mates Disco (300) that has an developed an alarming tendency to have a tankslapper at 50mph and above when the suspension loads/unloads (as he lives up on the moors this is quite often!).

It' bog stock other than having non LR alloys and skinny tyres, but these don't seem to be the problem as the reason I was up there was to try my spares (235/70's) on his motor - no improvement.

He's had polybushes fitted all round, new steering damper and everything checked out up on the ramps - no play anywhere!

While we were up there, we did notice however that there was a VERY small amount of play between the discs and the swivel housing, but only noticeable with weight on the car and rocking the entire thing side to side, and only top to bottom...
There was no discernable play in the swivel itself, which was the first place I looked being top/bottom play only.

Question is, would such a small amount of play cause such a violent reaction? The steering wheel is literally ripped from his hands as the entire front end of the car shakes from side to side. :eek: The reaction does not self correct, only braking to slow down stops the shake.
Also is there anything other than hub bearings or swivel pins that could cause movement separate to the axle?

Any bright ideas people?
 
Just been to cast my eye over a mates Disco (300) that has an developed an alarming tendency to have a tankslapper at 50mph and above when the suspension loads/unloads (as he lives up on the moors this is quite often!).

It' bog stock other than having non LR alloys and skinny tyres, but these don't seem to be the problem as the reason I was up there was to try my spares (235/70's) on his motor - no improvement.

He's had polybushes fitted all round, new steering damper and everything checked out up on the ramps - no play anywhere!

While we were up there, we did notice however that there was a VERY small amount of play between the discs and the swivel housing, but only noticeable with weight on the car and rocking the entire thing side to side, and only top to bottom...
There was no discernable play in the swivel itself, which was the first place I looked being top/bottom play only.

Question is, would such a small amount of play cause such a violent reaction? The steering wheel is literally ripped from his hands as the entire front end of the car shakes from side to side. :eek: The reaction does not self correct, only braking to slow down stops the shake.
Also is there anything other than hub bearings or swivel pins that could cause movement separate to the axle?

Any bright ideas people?
Try another steering damper !!!!
 
Panard rod bushes ? , excessive steering free play in the box , Steering UJ shot , rubber coupling at the end of the steering colum shot but that would be noticable by wondering steering .
Radius arm mounts coming off the axle ( not unheard of ) .
Wheels caked in mud ( heavy spot )
At an intial guess as im not there :)
 
Damper wasn't britpart and had good damping when fitted but made no difference!

Panhard bushes were changed along with every other bush. Steering is tight as a drum - mounts I didn't check but the guys who put the bushes in would surely have mentioned that...
Wheels are clean.

Keep em coming!
It's got most of the landy people from round me and up his way scratching their heads!
 
tell me about it!

doesn't seem like a prop issue as on a smooth flat road it'll do 80+ and not shake...
I did cop a feel of the props and uj's/donut though cos we're all thinking right outside the box now!
 
Im thinking prop slider as you say it does it on suspension loads/unloads , a siezed slider would in relation try to push the axle away from the tranny box and would cause huge vibration , but on flat road it would be smooth running
 
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