Thanks - I knew about the ball bearing and was careful not to undo the bolt too far. Would the system ever get pressure up if the ball bearing was missing? Is there an O-ring, or some other form of seal on that bolt? When I tighten it, should it reach a point where it is obviously tight? This just seemed to get tighter, without coming to a definite stop. Perhaps that diagram might be helpfulWhite Exec wrote: ↑Sat Jun 13, 2020 2:37 pmUnder the regulator pressure relief (depressurising) bolt there should be a ball bearing, which the bolt presses against a seat.
Wonder whether it is still in place? Or damaged/dirty?
There are warnings not to undo the bolt by more than about 1 turn, in case the ball falls out and gets lost.
Unusual to get a leak from just there.
Can post a diagram of the regulator innards, if you need it.
My first thought was that it had to be the return line leaking, and finding that it's held in place by a jubilee clamp with a long tail (ie wrong size) seemed to confirm that. However after tightening the clamp, and thoroughly cleaning the regulator, I'm pretty confident that it is the pressure release bolt.
Since I'm getting a few bits from Eathan, perhaps I should ask him to throw in the regulator. I could overhaul it and have it ready so the car is off the road for the minimum time...
Thanks - that is obviously very important to know! I had got as far as noting that the Xantia pump had a different part number, but had no idea there was such a profound difference.citroenxm wrote: ↑Sat Jun 13, 2020 8:19 pmThe V6 pump is unique and must not be mixed with any other engined car as the pump regulator is external to the pump (not system regulator) let's not get mixed up. The pump valve is on the passenger side of the front subframe..
I'm not sure if the 2.5td pumps are the same or not. They are visually but not sure on the valve regulator..
MIke (Xantia_V6) has already pointed out that the pumps used with the ES9J4 engines in the XM and Xantia have the pulley attached with little bolts. Is it possible that the Xantia V6 also has an external pump regulator?