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Austinsevenfriends › Austin Seven Friends Forum › Forum chat... v
Oil button diaphragm

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Oil button diaphragm
GCD Offline
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Joined: Jul 2021 Posts: 36 Threads: 7
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Location: Bath
Car type: 1937 ARR Ruby / 1928 RF (3)
#1
17-11-2022, 11:49 AM
Just done a service on my oil button - Been looking for guidance on material for a replacement diaphragm, but cannot see anything in previous threads. Have made replacement from an old rubber glove that seems to work OK on the bench with air pressure, but not sure if oil will degrade the rubber over time. Can some kind person steer me in the correct direction please. Graham D.
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Howard Wright Offline
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Joined: May 2018 Posts: 1,916 Threads: 102
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Location: Llandrindod Wells
Car type: 29 Special, 30 RK, 28 C Cab
#2
17-11-2022, 02:24 PM
Hi Graham

I think A7 Components stock button diaphragms.

Cheers

Howard
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Alan Offline
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Joined: Aug 2017 Posts: 1,257 Threads: 32
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Location: Cheshire
Car type: Race Ulster, 1926 Special, 1927 Chummy, 1930 Box
#3
17-11-2022, 02:34 PM
They do. Part no BG26d
Alan Fairless
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leaf200 Offline
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#4
17-11-2022, 04:34 PM
I am struggling to get mine to pieces. How do you remove the pressed in brass cap
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Vancevr Offline
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Location: California USA
Car type: 1929 austin 7 chummy AD
#5
17-11-2022, 04:50 PM
Theres a whole thing on Essex austin seven club. They use a dish wash glove. https://ea7c.org/oil-pressure-button-repair/
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GCD Offline
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Location: Bath
Car type: 1937 ARR Ruby / 1928 RF (3)
#6
17-11-2022, 05:08 PM
Thanks for the info - Diaphragms now on order.
To remove the pressed in brass coller I just followed the Essex Club instructions, including using the Wife's best washing up glove, but I am not happy with this solution. Hence the request for the correct item.
Graham
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Austin in the Shed Offline
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#7
17-11-2022, 11:11 PM
(17-11-2022, 04:34 PM)leaf200 Wrote: I am struggling to get mine to pieces. How do you remove the pressed in brass cap
Very carefully,The reason is when the bezel is screwed up its swages slightly the body around it.
The best way I found was to push the brass cap in slightly and with a scraper lightly dress the swaging off,hold the ebonite button in a 3 jaw chuck and pull carefully.
The brass washer that holds the spring behind the button is attached by a 5 Ba countersunk screw and it's easy to pull it out of the ebonite.
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