Hydraulic pressure gauge Silver Shadow 11 - Rolls-Royce and Bentley Forums
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post #1 of 52 (permalink) Old 03-30-2016, 09:00 PM Thread Starter
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Hydraulic pressure gauge Silver Shadow 11

Hi Fellow Enthusiasts. I need to test the accumulators and other hydraulic components on my Silver Shadow 11, SRH37250. I've purchased a Hydraulic 3000 PSI pressure gauge that has a 1/4 BSP male threaded fitting. The accumulator bleed screws are - I believe - 3/8 UNF x 24TPI. I need to attach a pipe between the gauge and the accumulator. I don't seem to be able to find hydraulic adapter fittings anywhere that will convert from 1/4 BSP to 3/8 UNF. I have managed to source a male adapter 3/8 UNF 24 TPI to M10 so I need to get from 1/4 BSP to either M10 or 3/8 UNF. Any suggestions would be welcome. Maybe the only way around it is to get the pipe flare nuts brazed at the connections but if anybody knows where I could locate suitable adapters I'd appreciate some advice, or if anybody knows where I can buy a hydraulic pressure gauge with an M10 or 3/8 UNF x 24 TPI male fitting that would be just dandy, Regards, Larry
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post #2 of 52 (permalink) Old 03-31-2016, 04:55 AM
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Hi Larry
I'm sure Brian has posted instructions on this , maybe in a tee topic .
Mike

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post #3 of 52 (permalink) Old 03-31-2016, 05:43 AM
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Hi,

If you look on ebay there are some firms selling adaptors of all different sizes and although not advertised or listed will probably have what you need if you phone them. You may need to go for two at each end.

We use an accumulator flex hose to connect the gauge to the car, ( more resistant to heat, has a bent on it, and the rotating flare nuts makes life easier) but a rubber brake flex hose will do for occasional use, just watch it near the exhaust when doing the accumulators.

You can probably get a rubber flex hose with various size and threads ends on which may do the thread size changes for you. Or a hydraulic hose firm might be able to make one up for you.
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post #4 of 52 (permalink) Old 03-31-2016, 06:25 AM
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I've had good luck with my local tractor repair/parts outfit making up hydraulic hoses with various fittings. I should think Wexford would be pretty similar to Louth in that regard, but truth be told I'm a blow-in yank so I don't really know....

Cheers,
Jeff.
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post #5 of 52 (permalink) Old 03-31-2016, 06:37 PM
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Hi Larry
I'm sure Brian has posted instructions on this . . .
Mike
More than once. I also recently decided to create a "Greatest Hits" thread regarding the articles I've either written or collected regarding SY hydraulics.

See SY Brakes & Hydraulics - Diagnostics & Maintence and have fun reading.

Brian

The opposite of a correct statement is a false statement. But the opposite of a profound truth may well be another profound truth.
~ Niels Bohr


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post #6 of 52 (permalink) Old 03-31-2016, 08:35 PM Thread Starter
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Thanks a lot for the advice and info. Brian's guide is brilliant. I just need follow the instructions using BSP fittings instead of NPT as there is a slight variation between the thread sizes and specifications in the good old USA and my little island on the other side of the North Atlantic ocean. Thanks everybody, Regards, Larry
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post #7 of 52 (permalink) Old 04-01-2016, 05:39 AM
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Hi Brian
Thanks for the links, I knew you had already done this.
Mike

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post #8 of 52 (permalink) Old 04-01-2016, 03:01 PM
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Thanks Brian

I am fairly sure I already have copies but downloaded them again, just in case. The information is so invaluable.

Geoff
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post #9 of 52 (permalink) Old 04-01-2016, 08:55 PM
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I just need follow the instructions using BSP fittings instead of NPT as there is a slight variation between the thread sizes and specifications in the good old USA and my little island on the other side of the North Atlantic ocean.
So long as all the bits fit together without leaking and the correct thread can go in to the ACV and the T fitting it really doesn't matter what thread standard you use on the "gauge head" end of the affair.

I remember when I first got my Silver Shadow II and somewhat foolishly presumed that, "There must be lots of info out there for the new owner and DIY mechanic about these cars," since most of them have been in the hands of the hobbyist and DIY community for decades now. I was sadly disappointed. After picking myself up, dusting myself off, and doing research with published materials and members of the RROC-US, RROC-Australia, and others I became determined, to the best of my ability, to create the resources I so sorely wished I had had at my fingertips when I was starting out. I've done the best I can on that front and hope to keep the effort going.

Brian

The opposite of a correct statement is a false statement. But the opposite of a profound truth may well be another profound truth.
~ Niels Bohr


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post #10 of 52 (permalink) Old 04-02-2016, 12:45 AM Thread Starter
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Thanks Brian, the knowledge you share is very helpful. My pressure gauge has a 1/4 BSP male connection (which seems to be fairly standard in Europe) but I can't get a reducing bush from 1/4 BSP to 3/8 UNF anywhere or in any combination of fittings despite trawling the net for hours. I have, however, just found a 1/4 BSP to 1/4 NPT adapter and with that attached to the pressure gauge connection I should be able to follow your diagram thereafter, Regards, Larry.
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