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Oil sending unit 69 charger ....tech needed #1297806 09/05/12 03:11 AM 09/05/12 03:11 AM
Joined: Feb 2005 Posts: 116 long island A autodynamics OP member
autodynamics OP member A Joined: Feb 2005 Posts: 116 long island	When I first put together my motor I had gone to the local parts store and bought a new oil sending unit, the gauge showed 60-80 lbs running, Sometime later the sending unit took a dump, the connector on the bell was loose so I replaced it, since then I have changed it 6x only for the gauge to read 20-40lbs The sending units look identical and no part # On them , I believe they made a few different models with different ohms Resistance , It's a ralley cluster and I'm using a ps-59 standard sending unit I have tried a Oem one as well with same low psi results Thanks in advance Pete Last edited by autodynamics; 09/05/12 03:13 AM.

Re: Oil sending unit 69 charger ....tech needed [Re: autodynamics] #1297807 09/05/12 03:28 AM 09/05/12 03:28 AM
Joined: Feb 2005 Posts: 116 long island A autodynamics OP member
autodynamics OP member A Joined: Feb 2005 Posts: 116 long island	Btw it's not the oil, I ve have checked it all out , it's the sending unit,

Re: Oil sending unit 69 charger ....tech needed [Re: autodynamics] #1297808 09/05/12 03:53 AM 09/05/12 03:53 AM
Joined: Jan 2004 Posts: 27,347 Today? Who Knows? 1_WILD_RT Management Trainee
1_WILD_RT Management Trainee Joined: Jan 2004 Posts: 27,347 Today? Who Knows?	Post a picture of the sender your using... BTW the OE manufacturer was Introl.... Have you tried installing a mechanical gauge temporarily to check the oil pressure? Might try contacting member JoeSixpack to see if he's got a quality vintage sender.. "The Armies of our ancestors were lucky, in that they were not trailed by a second army of pencil pushers."

Re: Oil sending unit 69 charger ....tech needed [Re: 1_WILD_RT] #1297809 09/05/12 04:16 AM 09/05/12 04:16 AM
Joined: Jan 2008 Posts: 486 Sonoran desert, Arizona, USA M moparjo68 mopar
moparjo68 mopar M Joined: Jan 2008 Posts: 486 Sonoran desert, Arizona, USA	The oil sending units on the market are a hit and miss in quality. I went thru a dozen or more 'till I could find one that would read over 40 lbs of pressure. I hooked a mechanical gauge to oil pressure so I would know true reading and what ball park reading I was trying to achieve from rally gauge. You say you even tried an OEM sending unit.........they are somewhat on the expensive side. I've seen them go for around $180. Cannot locate one any cheaper in price. Although the money I've wasted buying aftermarket crap......I wish I had put towards an original sending unit.

Re: Oil sending unit 69 charger ....tech needed [Re: 1_WILD_RT] #1297810 09/05/12 07:23 AM 09/05/12 07:23 AM
Joined: Jan 2007 Posts: 531 Charlotte, NC Kowal mopar
Kowal mopar Joined: Jan 2007 Posts: 531 Charlotte, NC	I just hooked up a mechanical gage on my Hemi, worried about the low oil pressure I thought I had on a break in motor. The Hemi is fine. The difference from the mechanical gage and the electric was stunning. I changed sending units and they still don't agree, but the new one was closer. I will probably take off the mechanical gage but only after I have a mental fix on the correlation. For the electrical stock gage, no oil pressure would be a right reading. Low might be low. High is high. That seems to be the accuracy. '69 Hemi Charger 500, ‘70 U code Challenger R/T (These and a bunch others at www.dkowal426.com) P.J. O'Rouke: "The old car ran perfectly, right up until it didn't."

Re: Oil sending unit 69 charger ....tech needed [Re: Kowal] #1297811 09/05/12 03:18 PM 09/05/12 03:18 PM
Joined: Feb 2005 Posts: 116 long island A autodynamics OP member
autodynamics OP member A Joined: Feb 2005 Posts: 116 long island	Ok I will post a pic up however it's the standard bell style sending unit with the spade terminal I did try another gauge and it's not the problem The sending unit must be different in the way the resistance Works ., I put the old one in and oil pressure is high I put any other ones in and they all read low My question is Are there two different types of bell style oil pressure Sending units ? Or is it just one style? The auto parts store says its the only one available Strange I do want to keep my factory gauge

Re: Oil sending unit 69 charger ....tech needed [Re: autodynamics] #1297812 09/05/12 07:19 PM 09/05/12 07:19 PM
Joined: Jan 2008 Posts: 3,886 Lost and Spaced B bboogieart master
bboogieart master B Joined: Jan 2008 Posts: 3,886 Lost and Spaced	I can't say for sure, but I see no reason for more than one type, as they all measure the same thing in the same manner. The dashes all work in the same ohms don't they? Did you try a mechanical gauge? I have mechanical Aptitude. I can screw up anything.

Re: Oil sending unit 69 charger ....tech needed [Re: autodynamics] #1297813 09/05/12 07:29 PM 09/05/12 07:29 PM
Joined: Jan 2004 Posts: 27,347 Today? Who Knows? 1_WILD_RT Management Trainee
1_WILD_RT Management Trainee Joined: Jan 2004 Posts: 27,347 Today? Who Knows?	Quote: My question is Are there two different types of bell style oil pressure Sending units ? Or is it just one style? The auto parts store says its the only one available Well do they mean it's the only one listed for Mopar that's available or the only one thats available period, cause if they are selling you a GM part the resistance is wrong.... "The Armies of our ancestors were lucky, in that they were not trailed by a second army of pencil pushers."

Re: Oil sending unit 69 charger ....tech needed [Re: autodynamics] #1297814 09/05/12 10:11 PM 09/05/12 10:11 PM
Joined: Jan 2003 Posts: 5,445 So Cal Sinitro master
Sinitro master Joined: Jan 2003 Posts: 5,445 So Cal	Quote: When I first put together my motor I had gone to the local parts store and bought a new oil sending unit, the gauge showed 60-80 lbs running, Sometime later the sending unit took a dump, the connector on the bell was loose so I replaced it, since then I have changed it 6x only for the gauge to read 20-40lbs The sending units look identical and no part # On them , I believe they made a few different models with different ohms Resistance , It's a ralley cluster and I'm using a ps-59 standard sending unit I have tried a Oem one as well with same low psi results Thanks in advance Pete Here is link for an original OE type, made in the USA not China or Mexico.... From Rich Ehrenberg... http://www.ebay.com/itm/Mopar-Oil-Pressu...-/221119969388? pt=Vintage_Car_Truck_Parts_Accessories&hash=item337bc6f86c&vxp=mtr Note that there are differences because inside the sensor is a variable resistor which has a % tolerance.. Just my $0.02..

Re: Oil sending unit 69 charger ....tech needed [Re: Sinitro] #1297815 09/06/12 01:27 AM 09/06/12 01:27 AM
Joined: Jan 2008 Posts: 486 Sonoran desert, Arizona, USA M moparjo68 mopar
moparjo68 mopar M Joined: Jan 2008 Posts: 486 Sonoran desert, Arizona, USA	Question: I clicked on the above link and looked at the oil sender unit. The patent number on it has the same patent number as the oil sender I bought from NAPA. This product on ebay, is it the same part I bought from NAPA since the patent numbers are the same????????

Re: Oil sending unit 69 charger ....tech needed [Re: moparjo68] #1297816 09/06/12 02:02 AM 09/06/12 02:02 AM
Joined: Jan 2004 Posts: 27,347 Today? Who Knows? 1_WILD_RT Management Trainee
1_WILD_RT Management Trainee Joined: Jan 2004 Posts: 27,347 Today? Who Knows?	I just clicked on the link & I have a concern with the unit, probably a good sender but I'd strip the teflon tape off the threads, the sender is a variable resistor so the teflon tape prevents a good connection to ground so it would cause a low reading.... I've never used sealer on the oil sender or the temp sender for this very reason & I've never had a leak from either.... "The Armies of our ancestors were lucky, in that they were not trailed by a second army of pencil pushers."

Re: Oil sending unit 69 charger ....tech needed [Re: 1_WILD_RT] #1297817 09/06/12 02:50 AM 09/06/12 02:50 AM
Joined: Jun 2006 Posts: 277 Cincinnati, Ohio C chargincharles enthusiast
chargincharles enthusiast C Joined: Jun 2006 Posts: 277 Cincinnati, Ohio	1 RT kinda hit on what I was going to ask you- How good is the ground at the sender- too much teflon tape will prevent a good contact and give a low reading. In a similar vein- how about your dash grounds? If they are weak, then you will get similar readings. I've learned through the years to check my grounds first- especially if I am going through sending units. Also- I always attach a 'known good' mechanical gauge- even if it temporary- to check my pressures if I think there may be an issue. Better to be sure then to be out a engine because you had low oil pressure. Good Luck with it, CC.

Re: Oil sending unit 69 charger ....tech needed [Re: 1_WILD_RT] #1297818 09/06/12 10:19 PM 09/06/12 10:19 PM
Joined: Jan 2003 Posts: 5,445 So Cal Sinitro master
Sinitro master Joined: Jan 2003 Posts: 5,445 So Cal	Quote: I just clicked on the link & I have a concern with the unit, probably a good sender but I'd strip the teflon tape off the threads, the sender is a variable resistor so the teflon tape prevents a good connection to ground so it would cause a low reading.... I've never used sealer on the oil sender or the temp sender for this very reason & I've never had a leak from either.... Keep in mind.. That the NPT is tapered so as the sensor is torqued down any teflon sealing tape will be worn down so the end tip of the sensor is down to metal-to-metal in its deepest penetration.. Also note that the mentioned sensor is made by the original factory that produced the Chrysler OE part... IMHO.. I don't like any brand after-market sensors as they can be all over the map for electrical tolerances possibly leading to errors for its readings. I prefer to stay with the OE versions whenever possible.. Just my $0.02..

Re: Oil sending unit 69 charger ....tech needed [Re: Sinitro] #1297819 09/07/12 12:28 AM 09/07/12 12:28 AM
Joined: Jan 2004 Posts: 27,347 Today? Who Knows? 1_WILD_RT Management Trainee
1_WILD_RT Management Trainee Joined: Jan 2004 Posts: 27,347 Today? Who Knows?	Quote: Quote: I just clicked on the link & I have a concern with the unit, probably a good sender but I'd strip the teflon tape off the threads, the sender is a variable resistor so the teflon tape prevents a good connection to ground so it would cause a low reading.... I've never used sealer on the oil sender or the temp sender for this very reason & I've never had a leak from either.... Keep in mind.. That the NPT is tapered so as the sensor is torqued down any teflon sealing tape will be worn down so the end tip of the sensor is down to metal-to-metal in its deepest penetration.. Also note that the mentioned sensor is made by the original factory that produced the Chrysler OE part... IMHO.. I don't like any brand after-market sensors as they can be all over the map for electrical tolerances possibly leading to errors for its readings. I prefer to stay with the OE versions whenever possible.. Just my $0.02.. I agree aftermarket sensors are all a question mark, and yes I understand NPT is a tapered thread which should cut through the tape & give a good ground, but I prefer not to chance it... I've never had a leak running without teflon tape & I know I get a positive ground... And that's my "The Armies of our ancestors were lucky, in that they were not trailed by a second army of pencil pushers."

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