Spring stuff
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RoloverRover
- Driver/Navigator
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- Joined: Fri Jun 09, 2006 12:00 pm
- Location: Wanganui
Spring stuff
Does anyone have any replacment spring bushes im after a complete set as i have discovered that my extremly severe steering shudder is cumin from to much play. When i say severe i have to come to a complete stop!!
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mroffroader
- Hard Yaka
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RoloverRover
- Driver/Navigator
- Posts: 44
- Joined: Fri Jun 09, 2006 12:00 pm
- Location: Wanganui
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Disco-Blue
- Hard Yaka
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Disco-Blue
- Hard Yaka
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IcedJohnno
- Trailer Trash
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- Location: Christchurch nr the hills
Suspect your issue is the Castor Angle or lack there of.
Think of a Chopper with the laidback steering angle, i.e. the wheel contact patch is behind the line projected from the Head set bearings to the rolling surface of the tyre. (In the case of Motorcycles or bikes)
Then think of a racing Cycle with much more upright steering.
The latter is much more responsive to the point of being very difficult to control over bumps and the former is very docile and slow to respond.
Sounds like you need to either rotate the whole diff assembly slightly (top backwards) or cut the end of the axle housings and weld these back on rotated slightly. I think de-ranged or perhaps someone else has done this on here but you definitely need a good jig that is well set up to do this properly.
Not sure on 4bys but cars tend to like about 2 to 3 degrees of castor angle. Some of the antique cars I occasionally race like about 5 degrees but the steering gets real heavy.
In the old car world this phenomenon is known as the Colly-Wobbles. And yes often stopping is the only answer. Another technique is to just let go of the steering wheel and let it thrash it out on its own. Fighting the reaction just makes the problem worse. It often can happen during low speed cornering
Other things to look out for are; worn steering joints, loose wheel bearings, unbalanced wheels and loose suspension mounting joints. They all contribute to the shuddering once the Colly-Wobbles start.
Cheers John
Think of a Chopper with the laidback steering angle, i.e. the wheel contact patch is behind the line projected from the Head set bearings to the rolling surface of the tyre. (In the case of Motorcycles or bikes)
Then think of a racing Cycle with much more upright steering.
The latter is much more responsive to the point of being very difficult to control over bumps and the former is very docile and slow to respond.
Sounds like you need to either rotate the whole diff assembly slightly (top backwards) or cut the end of the axle housings and weld these back on rotated slightly. I think de-ranged or perhaps someone else has done this on here but you definitely need a good jig that is well set up to do this properly.
Not sure on 4bys but cars tend to like about 2 to 3 degrees of castor angle. Some of the antique cars I occasionally race like about 5 degrees but the steering gets real heavy.
In the old car world this phenomenon is known as the Colly-Wobbles. And yes often stopping is the only answer. Another technique is to just let go of the steering wheel and let it thrash it out on its own. Fighting the reaction just makes the problem worse. It often can happen during low speed cornering
Other things to look out for are; worn steering joints, loose wheel bearings, unbalanced wheels and loose suspension mounting joints. They all contribute to the shuddering once the Colly-Wobbles start.
Cheers John
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RoloverRover
- Driver/Navigator
- Posts: 44
- Joined: Fri Jun 09, 2006 12:00 pm
- Location: Wanganui
I cant disagree with any of the above it is all fact so far i can eliminate the diff castor angle as mine is set at 11deg why they put it so far back i dont know but it sure does make the steering very heavy my wheels were balanced not all that long ago and i inspected the rims to make sure they were clear of any mud just incase. Next i had to do all steering joints as they failed a warrent with to much play and both front wheel bearings as they were also a warrent issue. I have jacked up the front of ma truck and checked that they are adjusted correctly and still spin free. So its down to the last 2 things i can think of and they are the spring bushes as it only gets the wobbles on if i hit a bump at the appropriate speed and it never does it under cornering. Or try putting in a big steering damper and power steering
