Posted By: autodynamics
Oil sending unit 69 charger ....tech needed - 09/05/12 07:11 AM
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
Posted By: autodynamics
Re: Oil sending unit 69 charger ....tech needed - 09/05/12 07:28 AM
Btw it's not the oil, I ve have checked it all out , it's the sending unit,
Posted By: 1_WILD_RT
Re: Oil sending unit 69 charger ....tech needed - 09/05/12 07:53 AM
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..
Posted By: moparjo68
Re: Oil sending unit 69 charger ....tech needed - 09/05/12 08:16 AM
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.
Posted By: Kowal
Re: Oil sending unit 69 charger ....tech needed - 09/05/12 11:23 AM
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.
Posted By: autodynamics
Re: Oil sending unit 69 charger ....tech needed - 09/05/12 07:18 PM
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
Posted By: bboogieart
Re: Oil sending unit 69 charger ....tech needed - 09/05/12 11:19 PM
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?
Posted By: moparjo68
Re: Oil sending unit 69 charger ....tech needed - 09/06/12 05:27 AM
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????????
Posted By: 1_WILD_RT
Re: Oil sending unit 69 charger ....tech needed - 09/06/12 06:02 AM
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....
Posted By: chargincharles
Re: Oil sending unit 69 charger ....tech needed - 09/06/12 06:50 AM
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.
