Lotus Elan

Electrical oil pressure sender query

PostPost by: Marct » Sat May 21, 2016 9:17 am

I have recently acquired an original Smiths 0 to 60lb oil pressure gauge for my 1968 Lotus Elan +2 which had previously been fitted with an incorrect capillary Smiths gauge. The trouble is I cannot locate the correct electrical sender to match the 0 to 60 lb Smiths gauge and I don't have the original sender to refer to. I have fitted a sender for a 0 - 100lb gauge but this gives an incorrect low reading. Can anyone tell me which sender I should be fitting and suggest where I can buy one.

Many thanks

Marc
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PostPost by: john.p.clegg » Sat May 21, 2016 12:26 pm

Yes

Smiths Industries PT 1817/06 unobtanium...will shortly be trying to modify similar to work,most second-hand units are not serviceable as there are vibrating contacts inside ( similar to the instrument voltage regulator ) which burn out.

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PostPost by: Sea Ranch » Sat May 21, 2016 3:54 pm

Whoa. Did not know this.

Is there not some modern part which can be used, calibrated, etc.?
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PostPost by: Spyder fan » Sat May 21, 2016 4:59 pm

there is a 60psi sender for a Jaguar E type that is available and has the correct impedance, unfortunately the thread is incorrect for an LTC . I seem to remember a topic on here about it but of course the search function defeats me to find it
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PostPost by: john.p.clegg » Sat May 21, 2016 5:11 pm

PT 1801/06,if you can find one,re-thread to 1/8 npt 27tpi.

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Last edited by john.p.clegg on Fri Aug 05, 2016 7:05 am, edited 1 time in total.
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PostPost by: Spyder fan » Sat May 21, 2016 5:19 pm

http://m.ebay.co.uk/itm/JAGUAR-OIL-PRES ... nav=SEARCH

They seem to be an easily available part
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PostPost by: john.p.clegg » Sat May 21, 2016 7:44 pm

Repro part....

Brand: MOSS EUROPE...

...?

John :wink:

P.S.

http://www.ebay.co.uk/itm/DAIMLER-JAGUA ... Sw5ZBWJRuM
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PostPost by: Marct » Sat May 21, 2016 8:48 pm

Thanks very much for the suggestions. I think the Daimler / Jaguar 1801/06 (C15474) is the way forward. I wonder if there is enough spare metal to re-tap the brass T piece into the block from 1/8 NPT to 1/4 BSP. Has anyone tried this?

Failing that I will try a 1/4 BSP female to 1/8NPT male adapter.

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PostPost by: john.p.clegg » Sat May 21, 2016 10:30 pm

Marc
Why do you have a T-piece?

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PostPost by: Spyder fan » Sun May 22, 2016 6:14 am

john.p.clegg wrote:Repro part....

Brand: MOSS EUROPE...

...?

John :wink:

P.S.

http://www.ebay.co.uk/itm/DAIMLER-JAGUA ... Sw5ZBWJRuM



Picky...? Won't it work if adapted? Buy from Moss or another reseller and take a guarantee as well. New old stock is nice if you really need original.
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PostPost by: john.p.clegg » Sun May 22, 2016 6:22 am

Not being picky but

IMHO the sender has to be matched to the gauge for the readings to be anywhere near accurate..

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PostPost by: Spyder fan » Sun May 22, 2016 7:13 am

John
Interesting, does that mean that gauges and senders were paired (setup together) originally?

If so it makes a nonsense of trying to buy a sender even an original if it's to be used as an uncalibrated item.

I gave up on the electrical pressure gauge years ago, I have a mechanical item that appears standard apart from reading up to 100psi, my LTC had a high pressure pump fitted and ran at60 psi hot as does my zetec.
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PostPost by: john.p.clegg » Sun May 22, 2016 8:26 am

Gauges and senders were not paired as such but the senders calibrated to match the senders "en masse",and as such sometimes the "intermotor " or other aftermarket senders are way out...

Any oil-fed gauge will probably read better,why do you need such high pressure,more is not always better..

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PostPost by: Spyder fan » Sun May 22, 2016 9:33 am

60 psi hot is standard on a zetec. My LTC came with a steel bottom end and hp pump.
Consistent pressure is what's needed. If it drops then that's a cause for concern. The actual figure is irrelevant so long as it's flowing
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PostPost by: Marct » Sun May 22, 2016 10:27 am

john.p.clegg wrote:Marc
Why do you have a T-piece?

John :wink:


Is that not standard then? The upright off the T piece has the low pressure warning sender screwed in the side and the oil pressure sender screwed into the top. It is this top thread that I will need to increase from 1/8NPT to 1/4BSP to accept the Jaguar pressure sender.

I will post the result.

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