I ask because there seems to be a problem with resistances and sizes of oil pressure gauges.
But I only have one set of each and need a bigger sample size to experiment with. Seems like AMC may have pulled a switcheroo on us.
Can't even trust the FSM right now...
So if you upgraded to a mechanical oil pressure gauge and and don't need your old Electric gauge. I would like to have it even if it doesn't work. I'll be glad to help with shipping also.
John I use a mechanical gauge since they are easier to install and they are relatively accurate. My opinion on the electric gauges, a good high end sending unit and gauge will beat a mechanical one hands down. The span and repeatably accuracy is far superior than a mechanical gauge however the offerings in the automotive world are lacking the quality so I go with the mechanical.
John,
I've got two electric gauges that I'm not using as well as two different sending units. I believe both sending units are after market, both gauges are original. I switched to a mechanical gauge because I couldn't get the electric ones working despite many many hours of troubleshooting. I don't like the idea of having an oil tube running through my firewall and under the dash though, so I would like to switch back to the electric if possible.
I'd be happy to photograph, measure, and analyze my gauges and sending units and send you all the stats if that helps. Or, I could send my four items to you for analysis if you were willing to send them back to me afterwards.
They changed resistances in 84. I have an 85 and my dad has an 83 and the resistances are different. I looked up when they changed but I'll have to see if i can find it again. I believe they newer gauges had the higher resistance.
Just goes to show us how small our CJ world is getting. I remember waaaay back in the early '90s, parts guys at offroad shops would tell me to go get a CJ and ditch the IH Scout because parts were easier to get.
I know my dads has the older one and in my jeep it only reads real low so I checked and the ohms were different than mine on my 85. I have to get a new one myself since my needle is broke so I'm trying to decide which way to go myself.
I do not believe so, I am the third owner, the second owner purchased it off a used car lot. I have no build sheet. It does have graphics over the hood and along the side. My gut feeling is it is not.
As far as I know, this is the gauge used on all CJ's from 1981-86 model years.
The parts manual for 1981-86 list the oil pressure gauges as being:
#J5750279 Gas Engine (0-100lb)
#J5764215 Diesel Engine (0-5.4 Bars) or (0-80psi)
#J5764214 no engine listed (0-7.0 Bars) or (0-103psi)
Only one Sending Unit is listed for all AMC engines 4,6 and 8 cylinder:
#J3212004
Both of my CJ5's are from 1980. One has a 258 from '78, the other has a 232 from '78. I have no reason to suspect that the gauges were changed, they are both old and most likely original.
My oil pressure gauges look like Keith460's.
I - S = 81.7 ohms
I - GND = 151.4 ohms
S - GND = 97.2 ohms
node - GND = 82.6 ohms
node - S = 14.8 ohms
node - I = 67.1 ohms
Egulaye,
That is a Zener diode you have listed as 82.5 ohms. which means the resistor and Zener locks in the voltage feeding the winding so any change in supply voltage will have no effect on the gauge.
Also a page from the 84 FSM:
That's not the back of the gauge Keith shows
That's the back of the 2" deep gauge...
But here is the picture of the gauge from the PART manual 84-86
Clearly the 1" Gauge.
Which look like the ones Kieth is using...!!!! **###%%##$@@(**
See my dilemma?
Egulaye,
That is a Zener diode you have listed as 82.5 ohms. which means the resistor and Zener locks in the voltage feeding the winding so any change in supply voltage will have no effect on the gauge.
John, when I used the diode function on my meter the reading was 0.07 ??? And the resistance value I put down was measured across the diode with either polarity. What's the breakdown voltage? I originally drew it as a diode, figuring it did what you describe, but measuring it w/ the DMM it just looks like a resistor.
So, in 1980 it was a 1" deep gauge, with a center stud for the ground connection (not present in your diagram from '84) and the two side by side studs for +12V and Signal reference.
Is it really possible that both pressure transducers I had were bad and that the new one I bought at NAPA was defective? What did I do wrong? (I don't really want to hijack your thread, but this bugged me for a long while before I bought the mechanical gauge)
Basically, I should have read that old thread first, to see what got you to this point.
Now I want to re-read this entire thread to figure out what you're really asking for. Did I already send you enough info on my two sets of '80 gauges?
I took the NAPA #OP6622 sender apart and see how it works now. Ah HA! And the "open" circuit at 0 psig is perfectly normal. Though personally I would prefer to set it to have resistance at 0 and lose a tiny bit of top end. My old 232 has so little oil pressure at idle that sometimes I wonder if there is any oil left in the block...
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