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 All about: 2CV suspension 
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Agony Aunt - You have a car problem? Speak to Ken

Joined: March 6th, 2009, 1:40 am
Posts: 3675
Post Re: All about: 2CV suspension
petitepoupee,
you will find the bump stops on brackets welded to the side of the chassis, located between the two tubes through which the axle bolts pass.

Using the appropriate slotted shims, adjustment should be made to give 3mm to 6mm clearance between the rubber buffer and the arm stop.

Ken



petitepoupée wrote:
Question is - what is there to limit the movement in bounce (upward travel) of the suspension arm? I can see quite clearly there is a rebound stop, but can't fathom how the opposite direction is limited. Maybe some sort of adjustment is required?

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April 5th, 2012, 9:53 am
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Joined: November 25th, 2010, 6:02 am
Posts: 125
Location: Adelaide, South Australia
Post Re: All about: 2CV suspension
Thanks Ken, and Viking ... we're off away for the Easter break and will have a closer look at the D*lly when I return. Yes Viking Peter, I was tempted to do the typical Aussie "bush repair" and bend/cut the sheet metal but really wanted to understand first the principle involved in suspension travel limitations.
The witness marks are still fresh, although the D*lly hasn't been on a Raid since 2008. Will report back after I've gone back into the young lady's mechanicals.
Cheers,
Geoff C.

ken wrote:
petitepoupee,
you will find the bump stops on brackets welded to the side of the chassis, located between the two tubes through which the axle bolts pass.

Using the appropriate slotted shims, adjustment should be made to give 3mm to 6mm clearance between the rubber buffer and the arm stop.

Ken



petitepoupée wrote:
Question is - what is there to limit the movement in bounce (upward travel) of the suspension arm? I can see quite clearly there is a rebound stop, but can't fathom how the opposite direction is limited. Maybe some sort of adjustment is required?


April 5th, 2012, 1:11 pm
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Joined: November 25th, 2010, 6:02 am
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Location: Adelaide, South Australia
Post Re: All about: 2CV suspension
Spot on, Knightley ... thanks to Ken's post I've at last found the rubber bump stop under the car (my, doesn't it help if one actually gets under to LOOK!) and it is obvious that the suspension is set too low as there is evidence of very frequent contact at that point. The other (rebound) bump stop looks as though it never makes contact. So now it's into it with the spanners... :)

knightley wrote:
Maybe your suspension needs adjusting. It could be low at the front. It's done at the eye on the end of the rod.

Needs careful setting up as adjusting the front will alter the back. Not done it myself, but someone on here (Ken or Sean ;) ) will have chapter and verse.


April 9th, 2012, 7:39 am
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Joined: April 27th, 2012, 6:48 pm
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Post Re: All about: 2CV suspension
i cant bring up the images russell, maybye they have expired, i,m just doing the suspension on a special and the images would be a big help!


June 30th, 2012, 6:49 pm
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Location: West Sussex, U.K.
Post Re: All about: 2CV suspension
I don't know how to get the images back, and I don't have them saved on a computer I can access easily as they're on an old pc at my parents house in their loft. I agree it does make the thread a bit pointless, but I'll see what I can do about taking some more. I am a bit too busy to go taking a car apart just for this at the moment though.

Sorry for the inconvenience!

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July 9th, 2012, 8:39 pm
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Post Re: All about: 2CV suspension
subarupete wrote:
Have done this to the tie rod ends after having some well polished ones.
Attachment:
P1010003.jpg

Need a carbide drill as its case hardened steel, can now easily grease and it keeps the dirt out
As for springs, a previous post suggested Veg Oil.


drilling a hole severely weakens it pete, i have a pic somewhere of one that broke, the knife edge puts massive load on it


July 10th, 2012, 3:21 pm
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Joined: May 3rd, 2009, 11:40 am
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Location: Melbourne, Australia.
Post Re: All about: 2CV suspension
I had an engineer mate look at the knife edge set up on my 2cv, he found it very interesting to say the least.
He asked why not put a bearing there instead, then I can be sealed and/or greased for off road use...

Harley

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samfieldhouse wrote:
It is M9 for the shocks yes, the rest I'll check when next i'm underneath her. Ironically, this will be valentines day.


July 23rd, 2012, 4:15 am
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Joined: April 22nd, 2009, 11:06 pm
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Location: Ecosse
Post Re: All about: 2CV suspension
uh ho here we go again

He didn't look at it too closely or see how it actualy articulates - the knife edge doesn't slide or move much in relation to the eye it just rocks. A larger diameter for the pin would introduce an element of sliding friction and that could cause more wear. The grease is there to reduce corrosion rather than lube any sliding, the wear of the knife edge and the eye are typical of "corrosion induced fretting"-or something like that, with small sharp striations rather than polishing.

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July 23rd, 2012, 7:59 am
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Post Re: All about: 2CV suspension
Sean wrote:
uh ho here we go again

:lol:
I was expecting that. He did look at how it rocks, it was then that he understood why it is a knife edge and not a round pin, as you mention if it where a greater surface area it would wear much faster.
A bearing would be a period acceptable/understood application.

Anyone have any other examples of the knife edge concept in use?

Harley

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samfieldhouse wrote:
It is M9 for the shocks yes, the rest I'll check when next i'm underneath her. Ironically, this will be valentines day.


July 23rd, 2012, 10:08 am
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Joined: April 22nd, 2009, 11:06 pm
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Post Re: All about: 2CV suspension
used in weighing scales to reduce the friction to negligable

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July 23rd, 2012, 5:52 pm
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