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8 & 10 cyl Bristol cars Type 407 onwards - restoration, repair, maintenance etc

Anti-roll bar Bristol 410

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  #1 (permalink)  
Old 03-09-20, 02:50 PM
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Default Anti-roll bar Bristol 410

Hello,

Can anyone offer some advice please before I start to strip down the front end of my 410.
The problem I have is to the anti-roll bar fixings. The area in question is at each end of the straight section of the roll bar, this is where the rubber bearing and bearing clamp are (indirectly) attached to the chassis. There is a small box section of steel welded between two pieces of tubular steel to which the bearing clamp is attached. The steel to the box section has corroded on both side of the car to the point it needs replacing. I donít think this part is available off the shelf, so I intend removing the offending parts together with the associated brackets etc and have new ones made. I intend to do one side at a time.
Do any members have a detailed drawing of the part in question of even old ones which I could use as a template before striping the front of my car down. Any advice or help will be very much appreciated.
Regards
Brian
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Old 25-10-20, 09:03 AM
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Not sure that helps a lot, but here are pictures of a very rusty 410 roll bar
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Old 27-10-20, 01:11 PM
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Thanks for the photos, unfortunately the photos donít help me. Ideally, I would like photos or a detailed drawing of the actual part or even an existing bracket that has been removed from a 410 which I could use as a template. The obvious risk of using an old bracket as a template is that it may be distorted if the car it came from had been involved in a front end shunt.
I will probably start the removal of my existing brackets sometime in November once they start spreading salt on our roads.
I will post a few photos of the offending part once itís removed and hopefully the new replacement.
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Old 21-11-20, 06:04 PM
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Zorglub,

Thanks once again for the photos you sent, if itís not too much trouble are you able to take another photo from ground level looking up to the underside of the anti-roll bar bracket, please? This would certainly help when I reconstruct the framework.

Now that I have removed the radiator and cover plates etc. I have a very clear view of the problem.

My 410 has previously had the mounting brackets for the anti-roll bar replaced. Who ever did those works appears to have cut out the existing brackets back to good metal on the adjoining tube framework and welded in the new brackets in a ďnear enoughĒ position. This position resulted in one of the fixing bolts on each side of the car being almost inaccessible. The only area of the tube framing and anti-roll bar brackets that has corroded is the actual bracket, all other adjacent steelwork is sound. The problem as to the cause of the corrosion is two fold. Firstly because the repairs were done in-situ any paint that had been applied to the bracket will have burnt off and the repainting would have not been adequate. Secondly, the brackets as installed (this may apply to other Bristols and should be checked) form a ďcupĒ without any drain holds which will hold water and allow the brackets to corrode from the inside, as mine has done.

I have attached a few sad photos of the affected area, it can be clearly seen the areas in question and the misalignment of the tubes.

I will post a few more photos once everything is removed.
Attached Images
File Type: jpg 7AFFD796-9874-4D93-AFE3-46958261B883.jpg (195.4 KB, 13 views)
File Type: jpeg 1B50C760-74A3-4138-98A2-AD61FF4FC574.jpeg (266.2 KB, 13 views)
File Type: jpeg 3330D0AB-7954-49AE-8EBA-7A17179CB449.jpeg (263.0 KB, 13 views)

Last edited by DODD; 21-11-20 at 06:09 PM.
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Old 22-11-20, 12:00 PM
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Dear Brian

I ended up using a 411 anti roll bar rather than the set-up for the 410 - mostly because BCL could not supply me with anything else at the time. You need to do a few modifications for the 411 bar to fit: mostly drilling four holes into the chassis and inserting steel rivet nuts. I originally used aluminum in 5mm, and then moved to steel inserts in 6mm. I am attaching a few pictures to illustrate this. Hope that helps
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Old 22-11-20, 12:03 PM
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You can see circled in red the attachment points
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File Type: jpeg Chassis points roll bar.jpeg (753.9 KB, 18 views)
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Old 22-11-20, 12:55 PM
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Dear Zorglub,

Yes, it certainly does help, I am assuming that you have fitted the roll bar on the rear section of the lower wishbone, is that correct?
If you have fitted it to the rear of the lower wishbone, was there sufficient clearance between the engine sump and the exhaust downpipes? Were you able to reuse the existing lower wishbones?

I hadnít thought it possible to upgrade to a later model, I will be making a few phone calls in the morning for parts availability and costs.

Itís also my intention to replace the rubber bushes on both the upper and lower wishbones during these works, working on the principle that they havenít been done for very many years and itís probably easier while the car is partially stripped down in this area anyway.
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Old 22-11-20, 12:58 PM
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Sorry, I posted a reply before seeing your second posting which answered most of my queries.
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