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Oil Pressure Switch

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William Smith

Oil Pressure Switch
« on: April 24, 2018, 12:56:01 PM »
I may have posed this question to the list some months ago, but don't recall getting a definitive answer.I have a 1980 TR7 DHC that has a three-wire oil pressure switch.B  The factory parts manual shows it to be p/n GPS123. It is a short bodied switch which screws into an adaptor, which, in turn screws into the oil pump housing. IB  understand that particular switch is NLA.B  All the vendor lostings for three-wire switches that I have seen only list long-bodied switches for earlier TR7 models (76 - 78 I think). IB  have also checked the TR7 cross reference list and it only shows the switch for earlier TR7 models. In addition, some of those long-bodied switches have 10mm threads, while others have 12mm threads. None of the listings give the operating pressure ranges for the switches, nor have I been able to find out what the pressure range for my car should be.Bottom line - perhaps one of the long-bodied switches would work if the adaptor is removed, but does anyone know for c

 ertain which switch will fit and work?As always, I'll appreciate the input.Thanks,B Bill SmithB '80 TR7B '72 TR6B





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Wayne@Last-Chance-Garage.com

Re: Oil Pressure Switch
« Reply #1 on: April 24, 2018, 01:12:44 PM »
Bill,



I have successfully usedb a NAPA/Echlin OP6610 or equivalent switch in the

past. I think that's the number, anyway. This is a 3 terminal long bodied

switch with 1/8" pipe threads. It threads directly into the oil transfer

housing.



I don't know what the pressure rating is and in this case I don't think it's

important.b All the switch does in the TR7 is light the light on the dash

and activate the Anti Run-On valve on cars so equipped, which would include

your 1980 model (and mine). The TR7 engine generally has good oil pressure

throughout the RPM range, unlike the Rover V8 which is marginal at speed and

problematic at idle.



As an aside, you shouldn't find any metric threads anywhere on the engine

block since this engine was designed before the changeover in the UK. You

might find metric in the carbs or other ancillaries, but not in the block or

heads themselves. Pipe threads will B be British Standard Pipe (BSP) which are

generally compatible with US NPTb except BSP is straight, not tapered. Just

be careful not to overtighten and use a thread sealant.



Best,

B  B Wayne



SentB fromB myB BlackBerryB 10B smartphone.

B  Original Message B

Sujit Roy

Re: Oil Pressure Switch
« Reply #2 on: April 24, 2018, 01:34:44 PM »

William Smith

Re: Oil Pressure Switch
« Reply #3 on: April 25, 2018, 04:28:51 PM »
Wayne/Sujit, thanks for the quick response.

Sujit, I haven't found anything specificallyB  indicating that the GPS 113 will work in the '80 TR7,B  but since Wayne has used the NAPA OP6610 successfully, I'm going to give that one a shot.

Thanks again guys!B  Much appreciated.

Bill SmithB



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