Harley, thank you, I'd often wondered what the advantage of a stud was over a bolt - now I know. I wonder if I could drill and tap the fitting on the chassis to normal citroen standards or failing that, have some studs machined up?

I'm working on a book of quotes...

Sam,
modifying the existing mountings would be your best bet, since making something as well engineered as the Citroen stud would be rather expensive.
The tapping drill size needed is 12.5mm and the tap is M14 x 1.5, however there's another detail of that assembly which is of some considerable significance and which I'd prefer to send direct to you, rather than have it broadcast...

@ Harley,
I'm not too sure about those stress diagrams you posted, especially if the stud is anchored in an alloy casting.
Advice nowadays seems to be that any stud into alloy should be only 'finger-tight', which is how I always fit the cylinder head studs for an A series engine.

http://www.motor.com/article.asp?article_ID=1315

The damper mounts, threaded into steel bushes, are a different story...

ken

Yes, I haven't time at the minute to read the article, when my brother helped me assemble my motor I kept questioning why he only just nipped up the head studs with his fingers! Sounds like he was right
The other consideration is that, from memory, 2cv and many other, head studs don't have a shank...


Harley

Thanks for this Ken, what else do I need (but probably not want) to know? I have the offer of a second hand one of yours for £300, which is looking increasingly tempting.

Harley,
you (or should that be your bruvver?) have got it...

Do it

Ill come help you swop the running gear over
Well nail it by lunch.......

Bin the shitty chassis

Daras,

Hetty's chassis is a Citroen one, but not an original '60s AK350 chassis. It's a replacement aks400 one, fitted when the van was heavily rebuilt in the '80s.

Are you sure? The receipt from Citroen says AK350... will check next weekend. Certainly has the larger studs.

Now I'm confused! What do mean by "the larger studs" Sam? 350 & 400 studs are exactly the same as each other except the outer threaded part for the nut is different, (and I thought yours were the smaller ones):
AK350 up to December 1967: M9
AK350 after that (and all aks400): M12
Of course, whether the replacement chassis was 350 or 400, as the studs inner threads are the same, they could have been transfered from the original pre-Dec67 chassis. (As far as I can remember there isn't ANY difference between a 350 and 400 chassis, of any age,........ is there? ).

I should have said "From memory"!



I'd believe that over my memory, any day of the week...