Rear anti-roll bar upside down?

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Rear anti-roll bar upside down?

Post by simmit » Tue Oct 18, 2016 8:36 pm

See the photo. On both sides, the bolt between bar end and axle bracket is bent. Why? What to do?

I suspect the rear axle bracket and roll bar end are out of line, but surely must be same dimensionally as all other MB's (yes/no?).

I note on MB50 the forward facing ends of the roll bar are not straight but bent upwards. Looks intended to me, so is it same for all MB's?

Being bent like this means the end face of the bar, through which the bolt passes, is not at right angles to the bolt which drops down from the axle bracket and possibly why the bolt has itself become bent. I haven't tried it yet but suspect that if I remove the bar and turn it upside down it will more suit the axle bracket alignment.

In passing, the axle to bar bolt diameter is merely 5/16". Does the committee think this adequate?

Help!
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Re: Rear anti-roll bar upside down?

Post by Terry Rickard » Tue Oct 18, 2016 9:12 pm

The Committee does not comment on technical matters like 'does the committee think something is adequate' as the Committee does not have access to the manufacturer's technical information.
You could compare the bolt sizes with those used on the front anti-roll bars and on anti-roll bar attachments used on other similar vehicles to help you decide.
You could also consult one of the Club Traders or repair businesses for advise.
Terry Rickard, Committee Member
Last edited by Terry Rickard on Tue Oct 18, 2016 9:40 pm, edited 1 time in total.



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Re: Rear anti-roll bar upside down?

Post by scimjim » Tue Oct 18, 2016 9:32 pm

I suspect the word committee was a generalised term Terry :-)

Looks like the wrong anti-roll bar to me but 5/16" is fairly typical for ARB droplinks.


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Re: Rear anti-roll bar upside down?

Post by simmit » Tue Oct 18, 2016 10:22 pm

scimjim wrote:I suspect the word committee was a generalised term Terry :-)

Looks like the wrong anti-roll bar to me but 5/16" is fairly typical for ARB droplinks.
Thanks Jim and yes, "committee" was meant in a light hearted manner.



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Re: Rear anti-roll bar upside down?

Post by Roger Pennington » Tue Oct 18, 2016 11:01 pm

That certainly does look a bit misshapen! I think what we really need is a photo of the same area on another Middlebridge, to be able to make a comparison?


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Re: Rear anti-roll bar upside down?

Post by simmit » Wed Oct 19, 2016 8:50 am

Roger Pennington wrote:That certainly does look a bit misshapen! I think what we really need is a photo of the same area on another Middlebridge, to be able to make a comparison?
Any volunteers?



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Re: Rear anti-roll bar upside down?

Post by mn757 » Wed Oct 19, 2016 11:57 am



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Re: Rear anti-roll bar upside down?

Post by simmit » Wed Oct 19, 2016 2:45 pm

Many thanks for the links to photo's in MESS (a great resource).

One of the photo's shows the subject bolt in part view and it seems quite straight to me.
Another of the photo's shows the roll bar and though it's not too clear I imagine it does have slight bend upwards towards the ends (as mine does on MB50)?

Now, if I have the correct roll bar (I don't see why it should not be) then provided (1) it is mounted right way up and (2) the axle bracket is welded in correct position/ alignment then the bend in my bolt must be down to stress over time and may well be a safety issue.

I suggest MB owners inspect rear ARB bolts ASAP. Feedback to this forum on inspection results would be much appreciated by all I'm sure.



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Re: Rear anti-roll bar upside down?

Post by Will Anderson » Wed Oct 19, 2016 9:39 pm

I have a recollection that someone in discussion (maybe Peter Freeman) mentioned something about this pressure on the drop links causing premature failure of bushes and possibly the links. Mind you my memory is not infallible! :)

If I ever get access to daylight again (as I appear to be going to and coming back from work in the dark ATM :( ) then I will have a look at, and photograph, MB14 and 46 as reference for you - if nobody gets there before me.


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Re: Rear anti-roll bar upside down?

Post by peter freeman » Thu Oct 20, 2016 8:52 am

I did write about the bushes failing within a year but since fitting poly bushes mine have been ok - however I have not looked at them for a long while. I did wonder if the bar was upside down at the time but like the photo above it was I was viewing with the back wheel off the ground - under load the aspect may be different.



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Re: Rear anti-roll bar upside down?

Post by simmit » Thu Oct 20, 2016 10:25 am

peter freeman wrote:I did write about the bushes failing within a year but since fitting poly bushes mine have been ok - however I have not looked at them for a long while. I did wonder if the bar was upside down at the time but like the photo above it was I was viewing with the back wheel off the ground - under load the aspect may be different.
Hi Peter

(1) Who supplied your poly bushes?
(2) I am considering modifying the arrangement to accept same drop link as used at the front ARB of 5/5a. What do you think?
(3) My photo was taken with rear wheels under load.
(4) Let me know condition of your bolts when you next inspect.



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Re: Rear anti-roll bar upside down?

Post by simmit » Thu Oct 20, 2016 10:39 am

Peter.

Forgive me for not picking up your previous comments on the subject:-

"The main problem I can see is that the connecting rod is not square with the top and bottom fixings which means that the bushes do not have pressure equally around them which causes one side of the bush to fail fairly quickly. I had though about finding another type of connecting rod and in fact have bought two to try but the poly bushes have so far not failed."

Which connecting rods have your sourced for trial?



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Re: Rear anti-roll bar upside down?

Post by greeny » Thu Oct 20, 2016 11:31 am

Just had another look at the pic and from the angle the arb looks not too far off..
It looks like the drop link is bent below or at the arb possibly due to being hit by somthing. Is the other side the same?


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Re: Rear anti-roll bar upside down?

Post by simmit » Thu Oct 20, 2016 12:09 pm

greeny wrote:Just had another look at the pic and from the angle the arb looks not too far off..
It looks like the drop link is bent below or at the arb possibly due to being hit by somthing. Is the other side the same?
Both sides are same.



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Re: Rear anti-roll bar upside down?

Post by peter freeman » Thu Oct 20, 2016 1:07 pm

I got the kit from QRG - after a chat with Nigel he thought that the SS1 front suspension poly bushes might be th3e same size as the rubber ones ( they are near enough ) on the ARB links so we thought we would give it a try. So far so good.



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