Re: V6 in Norfolk
Posted: Wed Jul 17, 2019 10:21 am
Hi John,
From the write-up of installing the Xantia valves in XM (October 2016)
viewtopic.php?f=7&t=8100&hilit=Evolution
" 10mm pipe connections
The Citroen working paper refers to the old ISO hydraulic union, and this being replaced from RP 8053 (25 March 1998) with a new CITROEN hydraulic union. The difference between the two is that the first type had a bell end to the 10mm pipe, while the second type featured a brass-and-rubber olive to make the 10mm pipe seal.
(The Citroen paper refers to notches on the new-type CITROEN unions; in practice, I found notches on both old and new unions.)
The new ‘internal pipework’ valves you have sourced could be of either type, but if you are going to fit a second type valve to earlier (ISO) 10mm pipework, or vice-versa, all that is necessary is to remove the large threaded unions (#14 in the diagram above) from your original valves, and screw them into the new ones. (The threads, internal and external, are identical, but the internal drilling is of a different depth and profile.) "
. .
I was making the point that the 10mm union design had changed, but if the XM's existing unions were fitted to the new Xantia blocks, the original XM joints would be preserved.
That gets over the issue of the changed 10mm pipes.
From the write-up of installing the Xantia valves in XM (October 2016)
viewtopic.php?f=7&t=8100&hilit=Evolution
" 10mm pipe connections
The Citroen working paper refers to the old ISO hydraulic union, and this being replaced from RP 8053 (25 March 1998) with a new CITROEN hydraulic union. The difference between the two is that the first type had a bell end to the 10mm pipe, while the second type featured a brass-and-rubber olive to make the 10mm pipe seal.
(The Citroen paper refers to notches on the new-type CITROEN unions; in practice, I found notches on both old and new unions.)
The new ‘internal pipework’ valves you have sourced could be of either type, but if you are going to fit a second type valve to earlier (ISO) 10mm pipework, or vice-versa, all that is necessary is to remove the large threaded unions (#14 in the diagram above) from your original valves, and screw them into the new ones. (The threads, internal and external, are identical, but the internal drilling is of a different depth and profile.) "
. .
I was making the point that the 10mm union design had changed, but if the XM's existing unions were fitted to the new Xantia blocks, the original XM joints would be preserved.
That gets over the issue of the changed 10mm pipes.