10 replies to this topic

[34banwell]

Hi I am restoring a mk1 cooper and have a manual pump for the windscreen washers that I would like to to keep for originality.

Thinking this was a strait forward job that would take 5 mins I connected up the washer bottle to the pump and from the pump to a t-piece and from t-piece to both washer. But this didn't work.

I have tried swapping the pipes around that enter the manual pump (thinking that maybe the pump worked only one way, but that didn't work. I also checked that the manual pump created suction (which seemed to be working as I could feel it creating suction when I put my finger or tongue against it and pumped the button.) The only movement of any water I could get was by sucking up some water with my mouth from the pipe that came from the washer bottle (to prime it) and then connect the pump to just that one line. It would then squirt a small amount of water out of the empty spout on the pump. But I didn't seem to be very much.

I have no experience of using it connecting up a manual washer pump and thought possibly the manual pump isn't creating enough suction (or vaccum) as it is old or perhaps I have just set it up completely wrong?

Any help or suggestions would be appreciated

Thanks!

[panky]

There should be a little non-return valve on the end of the pipe in the washer bottle.

[Stevie W]

As Panky has said, there should be non-return valve on the dip tube in the washer bottle.

 

From memory the manual pump has no valves inside it and just sucks/pushes water from both ports depending on whether the button is being pushed in or returning to the "out" position. One the "suck" cycle the pump pulls water up the dip tube from the bottle and then on the "push" cycle the action of the non-return valve prevents the water being pushed back into the bottle, so it can then only be expelled through the washer jets. There might also be a non-return valve on the washer jet side to prevent the pump drawing in air on the "suck" cycle but this I'm not sure on.

 

Cheers, Steve,

[panky]

If it's the same type as the one in my Minor it has a rubber bellows inside. I got it to bits and put a smear of silicon grease where the bellows pushes over the housing, works a treat now

[34banwell]

Yes I have had it apart and seen the bellows so I shall try greasing it, thanks :)

What does the non return valve look like?
The pipe in my washer bottle does appear to have a small mesh filter or something on the end of it, it's only pea sized I suppose? Is this it? Does anyone know what the non return valve looks like so I know if I have one fitted already. I'm guessing if I don't have one (or both??) it won't work????

[panky]

Try blowing back down the pipe into the washer bottle, if you can suck but cant blow into it then there's a non-return valve in there

 

It should look something like this, but if its gummed up then it wont work.

 

http://www.ebay.co.u...nWzlnolto4wvxkg

[34banwell]

Return valve solved the problem!
It needed a suck on the washer hose to pull the first bit of water up and then it worked perfectly.
Thanks 👍

[34banwell]

I'm also missing the nut that secures the pump to the bracket.

I think it may be made of plastic because the thread is plastic.
By the way it is an all black plastic manual pump secured to a small, almost L shaped bracket.

Any ideas if anyone would still make this nut or am I just going to have to find a normall nut from somewhere to fit. It would be a large 2 penny size nut needed if that helps? It looks like an old period pump so I guess it would be UNF?
I have a cable tie securing it at the moment so it doesn't look or work very well :/

Any help appreciated 🙂

[MikeRotherham]

I think it should look like this.

 

http://www.ebay.co.u...=p2047675.l2557

 

I had a 1968 MK2 Morris Mini 850, the nut was also missing on mine and held in place by wire (don't think plastic cable ties existed in those days!).

The pump never worked properly because it needed a good push to get anything sprayed on the windscreen.

Edited by MikeRotherham, 13 February 2017 - 08:49 AM.

[34banwell]

Yes, that is the one.
But where can I get a nut for it?
Do you know what size the thread is, so I can try and order one?

[tiger99]

The price seems a bit steep, so presumably they are made in very small batches? Apparently made of nylon, but from memory I thought they were chrome plated and circular, with two slots for tightening. Sadly, sold out.

 

http://www.somerford...roducts_id=4263

 

But you can buy a new pump complete with nut:

 

http://www.somerford...roducts_id=5179

 

I don't think it will be UNF. It is a fairly large diameter and the thread pitch is quite fine as I recall. Possibly UNEF? But you can start by measuring the diameter. Now you may wonder how to do that accurately. In your tool box you have a set of measuring tools, in increments of 1/16" more commonly used as spanners. Find the one that fits over the thread, with about 5 to 10 thou clearance, and you will have the diameter. Use a vernier calliper of course if you have one. Report back with the diameter and someone may know of places where thin nuts of that diameter are used. An inexact thread may possibly sometimes be force fitted and work ok on soft material.

 

Perhaps a long shot, but is a wiper spindle nut the same size?