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V8 250 oil pressure sender

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steve thomas
Posts: 23
Joined: Mon May 09, 2016 2:22 pm

V8 250 oil pressure sender

Post by steve thomas »

Good afternoon,
My V8 250 is suffering from low oil pressure when hot and idling. I thought it would be worthwhile changing the sender unit as I have read they are prone to under reading and I have a new spare that came with the car. My question is how to remove the old sender as there is very little room to get a spanner on it? Is it necessary to remove the lower radiator hose, or work from under the car? Alternatively, is it better to remove the adaptor that screws into the cylinder block?
Thanks for any guidance,
Steve

Tennant
Posts: 19
Joined: Sun Jan 20, 2019 7:13 pm
Location: Herne, Germany

Re: V8 250 oil pressure sender

Post by Tennant »

Hello Steve,
A 1/2" socket on a small wrench will remove the nut holding the pressure sensor mounting. The mounting and sensor will then slip off the bar on the engine. Put the mounting in a vice and remove the sensor.
Note that the mounting has a tapered hole and the large hole is on the engine side. You may need 2 new copper washers to replace the mounting.
A 5 minute job to remove and replace.

Best regards

Barry Tennant

steve thomas
Posts: 23
Joined: Mon May 09, 2016 2:22 pm

Re: V8 250 oil pressure sender

Post by steve thomas »

Hello Barry,
Thank you for your reply - very helpful. The job is done and i am now getting 45 psi cold tickover, falling to 25 psi at normal running temperature, and over 40 psi hot at 2000rpm. Obviously I don’t know if the new sender is accurate, but I’m happy to believe it is!!
Many Thanks
Steve

PaulR
Posts: 11
Joined: Thu Feb 20, 2020 1:30 pm
Location: Swindon

Re: V8 250 oil pressure sender

Post by PaulR »

Thanks Barry, Vey useful for me too. Last weekend I spent 4 hours trying to remove the oil pressure sender unit, but just couldn't get enough purchase on sender due to the tight space. This afternoon after reading your reply I tried what you suggested and removed the 1/2" nut from the end of the mounting (top left in my picture) and within 5 minutes I had the sensor & mounting off the car. After a few more minutes and with the use of a vice the sender came off its mounting but it was pretty tight. Now all I need to do is investigate my true oil pressure readings with a test gauge.

Many Thanks
Paul
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2020-05-02 12.44.57.jpg

User avatar
ttajf
Posts: 16
Joined: Tue Feb 02, 2016 1:04 pm
Location: Leicestershire

Re: V8 250 oil pressure sender

Post by ttajf »

Hello all,thanks for the information here,
where do i get an oil pressure sender unit of the correct type?
Tony
Kind regards
Tony

Tennant
Posts: 19
Joined: Sun Jan 20, 2019 7:13 pm
Location: Herne, Germany

Re: V8 250 oil pressure sender

Post by Tennant »

I got mine from SNG Barratt.
Barry

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