[Healeys] su pumps again

[Oudesluys]

Hi Andy,

I am sorry but I need the diaphragms I have for future rebuilds. I have 
started to rebuild SU pumps for our club members now I discovered how 
very simple it is.
I would suggest you look around for a few scrap SU-pumps with the same 
length of coil housing. Ebay could be a good source. Even rebuild pumps 
can be had for GBP60-70.

Cheers,
Kees Oudesluijs


Op 22-11-2016 om 21:29 schreef Austin Healeys List:
> My car had a generic 'modern' plastic pump which worked fine but isn't
> quite kosher so I got a new SU pump from Burlen and that is where I
> discovered the diaphragm issue. It really does let quite a bit of
> petrol smell through- enough for me to take it apart and look for the
> leak. Burlen sent a replacement diaphragm which is, of course, no
> better.
>
> If you have a used 60 year old triple layer diaphragm for sale I'd be
> interested in upgrading my new one!
>
> The best design I have seen is an Italian copy that had a single layer
> clear plastic diaphragm and also a plastic toggle inside the points
> which is so much simpler than the mousetrap. Been in a Bn2 for longer
> than I have been alive and only needed a replacement inlet fibre
> sealing washer to stop a leak.
>
> Andy.
>
> On 11/23/16, Oudesluys <coudesluijs at chello.nl> wrote:
>> I have not come across the single layer diaphragms. I have seen offered
>> on ebay new dual layer ones from China and the UK. So far I have had
>> enough scrap pumps of the wrong type to provide enough good triple layer
>> diaphragms for the ones that were fit for a rebuild as the so called
>> High Pressure type I want, AUF301 or W/AZX1307/8 or equivalent, so I
>> have no experience with the modern replacements.
>> The permeation of petrol will probably very, very little if any, so I
>> would not worry about it. Some modern rubbers withstand all fuels and so
>> as long as these are used it will probably be OK. Time will tell. Anyway
>> the pumps cast iron coil housing and the space on top under the bakelite
>> cap over the points assembly is vented.
>> As the old triple layer diaphragms seem to last for ever I would not
>> replace them other then when they have become hard and cracked or when
>> the thin plastic membrane that keeps the petrol away from the rubber is
>> damaged.
>> Kees Oudesluijs
>