oil pressure sending unit resistance - JeepForum.com
 
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post #1 of 9 Old 05-03-2016, 10:26 PM Thread Starter
clarkg
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oil pressure sending unit resistance

I have been trying to get gauges working on my 1976 cj5 with 258 engine.

The original? sending unit registered 262 ohms with the engine off. With the engine idling, it went to 0 ohms.

I decided the sending unit must be bad, so I bought an Omix-ADA sending unit. It registers 64 ohms with the engine off. With the engine idling, it also went to 0 ohms.

Is it possible that my oil pressure is high enough to drive both sending units to 0 ohms with the engine idling?

Thanks in advance for any help.

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post #2 of 9 Old 05-04-2016, 06:12 AM
John Strenk
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At this point, I would install a mechanical gauge just to check your actual pressure.
It could be possible you have exceeded the range of the sensor.
In either case you would have to be over 80 PSI

The sensor would be either:
0 PSI = 234-246 ohms
20 PSI = 149-157 ohms
40 PSI = 100-105.5 ohms
60 PSI = 65-69 ohms
80 PSI = 32.5-34.5 ohms

or:
0 PSI = 68-78 ohms
40 PSI = 21-25 ohms
80 PSI = 7-13 ohms


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post #3 of 9 Old 05-04-2016, 12:05 PM
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post #4 of 9 Old 05-04-2016, 12:43 PM
LumpyGrits
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Cj

Omix is junk!
Do as John sez-Go mechanical.
http://www.marshallinstruments.com/products/3013.cfm

LG

Have'n you along, is like loose'n 2 good men
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post #5 of 9 Old 05-04-2016, 02:03 PM
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post #6 of 9 Old 05-04-2016, 08:47 PM Thread Starter
clarkg
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Thanks for the replies and suggestions. Question: If the oil pressure is higher than the sensor range, would the sensor measure 0 ohms?
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post #7 of 9 Old 05-04-2016, 08:57 PM Thread Starter
clarkg
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Another question: This is on a 258 6 cylinder engine. I am scratching my head trying to think what could cause over 80psi oil pressure. Any ideas on what could cause oil pressure to go that high?
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post #8 of 9 Old 05-05-2016, 07:04 AM
John Strenk
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If you have an air compressor you can always check the sending unit:


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post #9 of 9 Old 05-05-2016, 09:21 PM
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Quote:
Originally Posted by clarkg View Post
Another question: This is on a 258 6 cylinder engine. I am scratching my head trying to think what could cause over 80psi oil pressure. Any ideas on what could cause oil pressure to go that high?
Stuck relief valve on the pump.

I call it a distributor, not a dizzy.
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