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Re: [Healeys] su pumps again

To: Oudesluys <coudesluijs@chello.nl>, Austin Healeys List <austinhealeyslist@gmail.com>
Subject: Re: [Healeys] su pumps again
From: "josef-eckert@t-online.de" <josef-eckert@t-online.de>
Date: Wed, 23 Nov 2016 12:56:26 +0100 (MET)
Cc: "healeys@autox.team.net" <healeys@autox.team.net>
Delivered-to: mharc@autox.team.net
Delivered-to: healeys@autox.team.net
Importance: normal
References: <a88b931a-d0cd-a294-abe1-8b514fe84e64@chello.nl> <a5c9a0b5-12bf-935e-6e19-1ab3cc59fa9b@comcast.net> <83893236-8e4c-3e9e-c27c-b69ce4d5b15e@chello.nl> <0629672d-05cb-0465-0783-44a94e55d0db@comcast.net> <abdb3144-5b3f-033f-d636-b0153c85650e@chello.nl> <CAGHuNqBb=kc-kwh9NQkS485PN8_e=AgpA=p=FH4ZqZESNtcV0g@mail.gmail.com> <0c65ad19-43ab-15f1-6bdc-9d3fb071d8fb@chello.nl> <CAGHuNqCUUH1TT=6S91Qd2+S7MFxx7-Hj59XnWNnnWDQz-aNL_A@mail.gmail.com> <1479881420791.4695054.89bb54d74f0b32a773e671a7600fd7887328284e@spica.telekom.de> <364bcc5b-f757-eb53-a790-fc1b1eb0a03d@chello.nl>
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@chello.nl>
An: "josef-eckert@t-online.de" <josef-eckert@t-online.de>, "Austin Healeys 
List" <austinhealeyslist@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@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@gmail.com>
> An: "Oudesluys" <coudesluijs@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@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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