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
Op 22-11-2016 om 19:07 schreef Austin Healeys List:
> Hi Kees,
>
> What are your thoughts on the modern diaphragms? They are single layer
> rubber and permeate petrol vapor into the inside of the pump where the
> points are sparking away. This doesn't seem the safest arrangement but
> so far hasn't caused a problem.
>
> The original ones were triple layer with a plastic membrane to prevent
> permeation but SU have gone for a more economical option with the
> replacements and I feel this may cause problems in the future when the
> rubber begins to deteriorate.
>
> Andy.
>
> On 11/23/16, Oudesluys <coudesluijs@chello.nl> wrote:
>> Op 22-11-2016 om 15:33 schreef Bob Spidell:
>>> We always try to repair any parts we can, if for no other reason than
>>> we're cheap asses.
>> Men to my heart. If anything goes wrong in our house the first thing I
>> do is open it up and try to fix it first before it is replaced and
>> thrown away when unsuccessful. All car parts that go wrong are treated
>> the same way with the exception that nothing is thrown away, but kept.
>> There may be some parts that can be useful for something at a later
>> date. You should see my garage!!
>>
>>
>>
>>> ps. Does EVERYBODY in Europe maintain and repair their own cars and
>>> parts?
>> Many classic car owners do. Of course there has always been a tradition
>> like that, especially in the UK. However the younger folk lack the
>> knowledge as they were not able to tinker extensively with cars with the
>> present many electronic gadgets and management systems. Of course there
>> are also people who simply cannot hold any spanner.
>>
>> Cheers,
>> Kees Oudesluijs
>>
>>
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