[Healeys] su pumps again

[Oudesluys]

Sorry Joseph, but I have to disagree. The plastic foil is on the bottom 
of the diaphragm opposite the stem, this is the pump and petrol side and 
keeps the petrol away from the rubber parts.
Cheers,
Kees Oudesluijs


Op 23-11-2016 om 12:56 schreef josef-eckert at t-online.de:
> The rubber comes first to the petrol and the plastic foil is opposit on the magnet side of the pump.
> Josef Eckert
>
>
> -----Original-Nachricht-----
> Betreff: Re: AW: [Healeys] su pumps again
> Datum: 2016-11-23T10:37:26+0100
> Von: "Oudesluys" <coudesluijs at chello.nl>
> An: "josef-eckert at t-online.de" <josef-eckert at t-online.de>, "Austin Healeys List" <austinhealeyslist at gmail.com>
>
> As the rubber in OE diaphragms is protected and separated from the
> petrol by a special plastic foil membrane, you should not have to worry
> about modern fuels.
> Kees Oudesluijs
>
>
> Op 23-11-2016 om 7:10 schreef josef-eckert at t-online.de:
>> I know SC Parts or LIMORA in Germany still have a batch of NOS tripple layer replacement diaphragms in stock. They are still in the original "BMC" package. I can´t guarantee these are better than the actual replacements available at Burlen, as modern fuels can be more aggressive to these materials.
>>
>> Josef Eckert
>> Konigswinter/Germany
>>
>>
>>
>> -----Original-Nachricht-----
>> Betreff: Re: [Healeys] su pumps again
>> Datum: 2016-11-22T23:53:40+0100
>> Von: "Austin Healeys List" <austinhealeyslist at gmail.com>
>> An: "Oudesluys" <coudesluijs at chello.nl>
>>
>> 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
>>
>>
> 
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