Churchill Hydrolastic Pump

[Peter1071]

I've dismantled my hydro pump to rebuild. All's going ok but I can't be sure how the bits in the photo go back together as the ball and split spacer piece tumbled to the floor when I took it all apart. I think that the spacer piece goes in the pressure pump, solid side down, followed by the ball against the split side, then the screw in piece?

Any thoughts?

Thanks,

Peter

[BLT]

You're right. From bottom up - it's ball in bolt first, then cross cut end against ball, then solid end uppermost in the pump. It's the inlet and the ball acts as a one way valve, blocking the inlet and forcing liquid up through the outlet during the pump stroke, which in turn is blocked by another ball during intake. Hope that helps -

a.jpg

b.jpg

[Peter1071]

Thanks for confirming this for me. I'm glad that my engineering brain guessed correctly!
Apart from a lot of slop in all of the pivot pins, which I should be able to replace, the pump components look ok.

Peter

[Peter1071]

Looks better after a strip down and rebuild. Yet to test it on a car though.

[111Robin]

Top work. I've still to start on my skip find pump, or it will soon be returning from whence it came.

[Peter1071]

I'd like to thank Robin for helpful information and guidance concerning my damaged restrictor for this pump. Also Glen in Australia who put me in touch with the very knowledgeable Tony Cripps of Leyland Australia who offered some good advice.
I bought some brass tube, 7mm o.d 1.5mm wall thickness which I found on Ebay. I made a new restrictor from this with a Dremel type tool and all is now working well on the pump side.Luckily, precision engineering is not required. I bought a displacer unit test rig and this will help me test the four displacers I have chosen for a project and all the others I have squirrelled away, maybe 16?
The vacuum side needs a new schrader connector as it's not sealing well, then I can test this side of things.

I bought a second pump recently in the hope that I could could make one good working unit. This second pump, a later one, looked in great shape when I stripped it down and is working well on the pressure side. The vacuum side also works well although the gauge doesn't work.

[OGW 1082]

Hello Peter,
You've made a nice job of your pump restoration it looks good. Glad I could help.
I have some good information here on pump repairs. If you want a copy PM your email address and I'll
forward you a copy.
Kind Regards,
Glen

[Andrew1967]

PM sent Glen

[111Robin]

Nice work Peter. I'd like to revive another as I've tended to buy multiples of parts when restoring mine and also helps while it's fresh in the mind. Mine is finished now except for some new rubber feet. I replaced all of the high pressure tubing and fittings, the original olive type connections were difficult to cure leaks on so I replaced them with barbed hose tail fittings. These have all passed pressure testing successfully. I was missing the bleed valve so I've just added a tee piece with a bleed nipple that serves the same purpose until I can find the correct type. The vacuum side holds solid as well, really just needed to free off the stuck piston and lubricate the seal and it was fine. Lots of help from forum members as usual made it much easier to complete.

20200817_161028 by Robin Derrick, on Flickr

20200817_161054 by Robin Derrick, on Flickr

[OGW 1082]

Hello Robin,
Also looks good. I think there is something satisfying about having a working pump of your own.
You can guarantee the quality of the fluid in the machine. I also fitted small see through filters to
the supply and return lines just to try and protect the inner workings.
Regards,
Glen