Bump Stops in rear arches

Technical advice Q&A

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kgb123
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#1 Bump Stops in rear arches

Post by kgb123 » Thu Apr 05, 2018 5:23 pm

Evening all,

Re the below image. Can anyone tell me if what I'm referring too as a "Bump Stop" is available to buy as a stand alone assembly? The complete assembly is a hard rubber, almost circular bush, mounted in a metal holder which is in turn welded to the bracket assembly

Image

The R/H and L/H sides appear to be welded onto the bracket assemblies for mounting the IRS cross member. I do have the original Jaguar parts catalogue for my 2+2. The brackets are BD2860 and BD2861 for R/H and L/H respectively. However the images in the catalogue do not show these "bump stops" as part of the assembly.

The ones I have on my car have suffered from corrossion where they've been welded on. The brackets on each side are in good nick with only minor repairs needed, so I'm keen to source replacement.

Also whilst on here. I've a part number for the "rear" jacking point from the Martin Robey catalogue. Are the 4 jacking points all the same or are rear different in shape/fitting to front?

Thanks

Kevin
1968 Series 1.5 2+2

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mgcjag
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#2 Re: Bump Stops in rear arches

Post by mgcjag » Thu Apr 05, 2018 5:32 pm

Hi Kevin...my car is a 69 2+2...i did buy the rubber bumpstops they have one or two studs on top to fix to the brackets.....my brackets were ground off....im sure you can get the bracket assembly ive seen them as i was going to get a pair but never got around to it...Steve
Edit https://www.sngbarratt.com/uk/#!/Englis ... 6a7a4235e3
Steve
1969 S2 2+2 & Building a C type replica

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cactusman
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#3 Re: Bump Stops in rear arches

Post by cactusman » Thu Apr 05, 2018 6:32 pm

Mine is the same....bracket ground off. I did ask Angus about it and he said simply don't bother with them... :bigrin:
Julian the E-type man
1962 FHC
1966 MGB....fab little car too

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#4 Re: Bump Stops in rear arches

Post by 1954Etype » Thu Apr 05, 2018 8:10 pm

I haven’t had them on any of my cars and never needed them. Now if someone can tell me why l do, I’m happy to be educated!😊
Angus 65 OTS 1E11497. 67 FHC 1E33656

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kgb123
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#5 Re: Bump Stops in rear arches

Post by kgb123 » Thu Apr 05, 2018 8:57 pm

Good enough for me gents, the considered opinion of three learned gentlemen indeed. I'll run without them.
Thanks for your replies
Kev
1968 Series 1.5 2+2

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#6 Re: Bump Stops in rear arches

Post by Heuer » Thu Apr 05, 2018 10:14 pm

Not that simple. If you remove them you need to install bump stops into the rear shocks to compensate: viewtopic.php?p=98599#p98599

Jaguar installed them to protect the shock absorbers from, well, shocks. You do not want the dampers bottoming out and having metal to metal contact on full compression - that will hurt!
David Jones
S1 OTS OSB; S1 FHC ODB

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chrisfell
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#7 Re: Bump Stops in rear arches

Post by chrisfell » Thu Apr 05, 2018 11:25 pm

No bumps stops on my 2+2. Long time since they were there. In more than 55,000 miles never once have I bottomed out the suspension. With the car fully loaded with 14 days of kit for touring holidays and loads of spares parts (just in case) I’ve grounded the exhaust many times, but never bumped the suspension against the body.
Chris '67 S1 2+2

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#8 Re: Bump Stops in rear arches

Post by mgcjag » Fri Apr 06, 2018 7:56 am

Hi Kev...just to clarify....im not advising you leave them off....its just that i never got around to get the brackets and haveing them welded on.....if i was haveing a rear refurb i would re install them.if for no other reason than they were originaly fitted.... Steve
Steve
1969 S2 2+2 & Building a C type replica

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#9 Re: Bump Stops in rear arches

Post by 1954Etype » Fri Apr 06, 2018 9:12 am

I've always believed that if you need the bump stop you would have more serious problems to contend with!
Angus 65 OTS 1E11497. 67 FHC 1E33656

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Jeremy
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#10 Re: Bump Stops in rear arches

Post by Jeremy » Fri Apr 06, 2018 9:46 am

I suppose if you are taking hump back bridges at 75mph they might come in handy :shock:
Jeremy
1967 S1 4.2 FHC

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#11 Re: Bump Stops in rear arches

Post by Heuer » Fri Apr 06, 2018 11:22 am

You will not bump the suspension against the body, the shock absorbers will bottom out striking metal against metal internally. You probably won't even notice until the shocks prematurely fail or you realise the handling is off. Nothing to do with taking bridges at 75mph or driving like a lunatic - you can achieve full compression of the shock in a pot hole and given the state of our roads that will not be a rare occurrence. Apart from potential damage they also affect handling. Jaguar put them there for a reason otherwise Mr Arthur Whittaker would have taken the opportunity to delete them and save cash!

I speak from experience as I had three Koni shocks fail within 15,000 miles as the bump stops were missing. I now have bump stops in the shock absorbers and never had a problem since. So for all you flat-earther's who think it is not a problem suggest you watch this:



Just Google 'bump stops' and you will have lots more information plus a huge after-market supplying them. Once you have ground off the stop brackets there is no easy way of going back other than the simple and effective solution of adding the stops to the shock absorber shaft. I have to say the response to my post really surprises me given you all seem right thinking and experienced owners :shrug:
David Jones
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#12 Re: Bump Stops in rear arches

Post by cactusman » Fri Apr 06, 2018 12:20 pm

Wise words David. Guess I'll investigate having the brackets welded back. Some PO ground them off :questionmarks: Mean time gently does it....
Julian the E-type man
1962 FHC
1966 MGB....fab little car too

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#13 Re: Bump Stops in rear arches

Post by chrisfell » Fri Apr 06, 2018 2:25 pm

cactusman wrote:
Fri Apr 06, 2018 12:20 pm
Wise words David. Guess I'll investigate having the brackets welded back. Some PO ground them off :questionmarks: Mean time gently does it....
What was more likely in the case of my car was that rust required the removal of the bump stop bracket, and cost of replacement, compared with a patch cut from a sheet, meant it was not replaced. Your P.O. may have thought the same.
Chris '67 S1 2+2

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#14 Re: Bump Stops in rear arches

Post by Heuer » Fri Apr 06, 2018 3:06 pm

If you want more information on the subject it was covered extensively here: viewtopic.php?t=6421 complete with part numbers and supporting calculations.
David Jones
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#15 Re: Bump Stops in rear arches

Post by Gfhug » Fri Apr 06, 2018 3:55 pm

My bump stops were removed, presumably, when the fat 205/70 tyres were fitted.
I've searched for the parts shown in that other thread "Ohlins bump rubbers #00563-03" but to no avail.
Does anyone know of where they (or an equivalent) can be found?
Thanks

Geoff
S2 FHC Light Blue

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#16 Re: Bump Stops in rear arches

Post by Heuer » Fri Apr 06, 2018 4:02 pm

http://resuspension.com/index.php/catal ... q=00563-03

There are probably other makes that will fit but finding equivalents is a problem because Jaguar never specified them for use inside the Factory shock column. So trial and error unfortunately or worth simply buying four of what Eric recommended. Also I am not sure you can dismantle modern Boge shocks so the easiest route is to cut a split in each and slip them on as per Eric's instructions.
David Jones
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#17 Re: Bump Stops in rear arches

Post by Gfhug » Fri Apr 06, 2018 4:03 pm

Thank you, David. I guess I was only looking in the UK, not over the pond

Geoff
S2 FHC Light Blue

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#18 Re: Bump Stops in rear arches

Post by 1954Etype » Fri Apr 06, 2018 5:23 pm

Still not putting them on my car!😊
Angus 65 OTS 1E11497. 67 FHC 1E33656

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#19 Re: Bump Stops in rear arches

Post by mark10337 » Fri Apr 06, 2018 6:45 pm

Gfhug wrote:
Fri Apr 06, 2018 3:55 pm
My bump stops were removed, presumably, when the fat 205/70 tyres were fitted.
I've searched for the parts shown in that other thread "Ohlins bump rubbers #00563-03" but to no avail.
Does anyone know of where they (or an equivalent) can be found?
For the S2 it is part No. C.25938 available at SNG.
I have it fitted on the rear left but not on the rear right due to a new mount being needed. The rear right makes quite a clunk on the motorway when I go over an uneven part.
-Mark

1969 Series 2 OTS, Regency Red
'Life's to short to drive a boring car'

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#20 Re: Bump Stops in rear arches

Post by johnetype » Fri Apr 06, 2018 7:51 pm

The irony is that whilst 205 tyres might foul the bumpstops, there's enough "meat" to allow you to grind a little off the brackets and the metal plate in the standard bumpstop so you can keep your 205s if you must and have functional bumpstops.
John

1969 Series 2 FHC

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