Default Re: Oil pressure gauge 

Old 06-02-2012, 02:14 AM   #11
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This is YOUR THIRD THREAD on the jeep oil gauge problem.

I gave you the answer on the last two threads. The sender/ gauge need to be matched.... NOT matched and it will not work.. LOTs of confusion on the Jeep CJ offerings at this time.... If you do not understand what was give then ask questions and I can try to help further.

Once the combo is verified.... John Strenk? over on Jeepforum has some very good CJ Gauge trouble shooting and gen info on his signage on each one of his posts.

Also IF tooooo much teflon tape was used on the sender thread when put in the engine block can cause issue.... The SENDER grounds to the block and changes resistance with pressure...TOO much teflon tape will not alloow the sender to ground to engine block. Once gounded to blocke, It / SENDER acts like a variable resistor...... and it needs ground to the block..... I used thread sealant vs the teflon tape for the pres and temp senders for this reason. Can also ck the sender is grounded to the block with a multi meter using resistance or continuity tone...

 

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Default Re: Oil pressure gauge 

Old 06-02-2012, 07:40 AM   #12
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I went with the Auto Meter black face chrome lip for volt meter and oil pressure gauge. They match well with speedometer and as with all come with fitting to go in threaded opening for sending unit near your oil filter. Be sure to put some thread sealant on fitting. Biggest problem is routing plastic line to avoid heat and crimping. I ran mine along heater hose and found convenient place to drill through firewall for gromett.

 

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Default Re: Oil pressure gauge 

Old 06-02-2012, 12:05 PM   #13
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germy,

Just realized we're working on your driveability problem too.


Is it possible that you actually don't have any oil pressure?
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Old 06-02-2012, 01:01 PM   #14
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That sir is possible, wouldn't that result in overheating? Sorry if I'm reporting old problems, it's been a whole winter since last visit.

 

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Default Re: Oil pressure gauge 

Old 06-02-2012, 03:09 PM   #15
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Vehicle(s): 1978 CJ7 Silver paint with black hard top on 33" radials & eagle alumium rims. Good looking ride and have done lots of work to make it look and run great. Stock equipment is 258 carb, power brakes, power steering, hard top & hard doors (per vehicle gross weight) tilt steering wheel, big brake package with large rotars & drums, T18 Trans with low 6.4 granny gear, Dana 20 transfer, Dana 30 front axle, Dana 44HD rear axle with 3.73 gears. True Trac ft & rear. I was around jeeps in the 70's and drove a 1973 Jeep Truck. My family had 4 jeeps at the time. We also joined a jeep club back then too. So about 6 years ago looked for a Jeep CJ and found the vehicle above.
 
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I use a liq filled gauge with the sender mount.... So I have indication on the motor/under hood and I have a dash mount gauge that works with sender...

Could always use a liquid gauge under hood with a brass 1/4 to 1/8 NPT adapter from Menards, home store, or hardware store will have the NPT, national pipe thread, adapter for about $1. I go to the farm stores for liq gauges they usually have Stainless Steel Liq gauges fro about 10-15$$$ and have many ranges.... get a 0-100 psi.

You can verify you have oil press...

Also... if you chew cam gear.... the distributor end spins the oil pump so if your dist ate the cam gear you will loose your oil pump also....

HEI failures are huge right now and frequent.... I have helped on over 100 of them.... So do the test and review shared with you in your other post.... will guess 2:3 or 65% chance you have a HEI failure going on here. NOT a good situation if the issue, but very well could be,



This was posted to two oil gauge threads from this past October 2011. Again resistance range of sender and gauge need to match or there will be wrong reading or no reading... I plotted the oil sender using compressed air, adjusting air regulator and the use of a pres gauge to set the reglator. Used resistance readings on multimeter to read / ck resistance from threaded mount area to the isolated electrical stud.

Did you use teflon tape on the oil sender???????????????????????? stops the oil/temp sender from grounding to block/head and will keep system from working....

Quote:
Originally Posted by MN CJ7 View Post





Jeep Oil Sender Gauge Options & Ranges

Many sellers of Jeep Gauges are listing their product for working for all JEEPs and it is just not true….. not true if you want the oil gauge to match the oil pressure on the PRESSURE GAUGES mounted on the engine often done for new engine rebuild start ups…….


The old Jeep Sender and Gauge parts and information is messed up at this time. I went thru this about a year ago, there is a general mixed up of the SENDER resistance ranges and the OEM electric gauges that will work correctly with them. So I dug in to fix my issue and this is what I found on the resistance ranges of stock CJ gauges and senders……….. this what is being sold new and what will work for our CJ..

The older CJ's of the 70's use a 2" thick gauge and their own Specific sender and resistance range.

The newer 80’s Cj's have a 1" gauge and a different sender and resistance range.

Full Size Jeeps for the 70s & 80s… also called the FSJ, for these same years have yet another gauge and sender combo with another resistance range. The Field Service Manuals have the resistance levels / ranges listed for the jeeps years of interest if you need to ck the numbers further…

The Gauges and senders cannot be mixed up or the mix combo will not read the correct oil pressure level. I ordered several and many combos do not work… So it is very easy to get the wrong stuff and pair up the wrong stuff. …….. Many sellers of Jeep Gauges are listing their product for working for all JEEPs and it is just not true….. not true if you want the oil gauge to match the oil pressure on the PRESSURE GAUGES mounted on the engine often done for new engine rebuild start ups……. I like having the oil gauge on the engine so decided to keep it there. I currently use the engine mounted/ installed gauge and OEM Jeep oil gauge/ oil sender….. and yes they do match and can match in psi readings.

The 1970's CJs use a 2" gauge
The sender to use is from NAPA #OP6657
Expensive little bugger and is $60, maybe you can get a discount, and if needed can also consider getting the Crown Gauge & Sender because the cost will be similar. I will give Crown info after the Napa Info.
I hooked this up to a presure regulator and gauge and ploted the pressure and resistance ranges using a multimeter.

Pressure............Measured............spec range CJ 1979 FSM
0-3 psi..... ..........239 ohms...........234-246 ohms
3-7......................239..................146-219
40........................108..................100 .5 – 105.5
60………………………………………………………..65.69
80........................40....................32 .5 – 34.5


Some time in the 1980's Jeep CJ went to a 1" thick gauge and the oil sender resistance ranges are different. Crown does have a sender that will work, Crown #3212004 and sells for about $20. Morris 4x4.com was selling at 10% discount for a forum discount at the time so it cost me $19 and $4 to ship. Morris and Crown at that time list this for 1975 to 1986 for all CJ, Wagoneers and THIS IS NOT TRUE. THE CROWN SENDER WILL ONLY WORK WITH THE CJ NARROW 1" GAUGE.

This is what I measured with the Crown sender and a pressure regulator, gauge, and multi meter.

Pressure............Measured............spec range
0-3 psi..... ..........70 ohms...........68-70 ohms
20........................33......................
40........................23..................21-25
60........................14....................
80.........................9....................7-13


FURTHER caution is the CJ and Full size use a different gauge and sender. I went thru about 15 years of Jeep Field Service Manuals, FSMs, and they do list the resistance ranges and have pictures / drawings of the oil gauge face. The 1" and 2" gauges do have different faces. I would measure the oil sender pres/resistance range before installing any.

The Crown gauge is in the $20-30 range is I remember right. So it might be less expensive to get the Crown Gauge & Sender compaired to the $60 Napa sender needed for the 2" gauge. I have also been looking for a spare 2" CJ oil gauge and they are not easy to come by. Just thought I would mention this option as well.

TEMP SENDERS are also a issue. I purched 3-4 inexpensive units and the temp/reistance range was not correct. I ordered Napa's premium unit,Elchin? Brand, double the price, and boiled it in water prior to install to test, can also be returned as new if does not pass test, and the boil waster is 212 Deg F or very close and will have a resistance value about 35 ohms. Take it out of boiling water FAST put on paper towel, something that is not a heat sink, and measure the resistance with a multimeter. This needs to be done FAST you will see the resistance change in seconds. Thought I would throw this into the conversation about CJ gauge solutions.

My Temp gauge was bairly reading with PO set up. That temp sender and 3-4 more all failed till I tried the Napa Elchin premium version for the CJ Temp Sender. That one measured correctly.

I have seen the pressure and temp issues dozens of times.

Hope that helps.

 

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Old 09-23-2012, 08:53 PM   #16
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Upon disassembly of motor I looked into the oil pressure sender. There was a block of aluminum threaded into block. Then another block threaded into that. The sender was then threaded into it. So the sender was parallel to the block. Is this normal procedure or could this be a source of problem?

 

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Old 09-24-2012, 01:43 PM   #17
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I know this is an old issue, but anyone have an idea?

 

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Old 09-24-2012, 10:05 PM   #18
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imageuploadedbytapatalk1348539148.074767.jpgThe main thread is large and progressively get to sending unit thread. Is this odd, could this be my problem?

 

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Old 09-27-2012, 08:58 PM   #19
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I demand an answer!!!

 

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Default Re: Oil pressure gauge 

Old 09-27-2012, 10:29 PM   #20
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I dont think that is the source of your problem..
I also have a couple of fittings screwed into each other, stepping down the threads...

But I have a mechanical oil pressure guage sender as the final fitting. I did away with the old guage years ago.

I'd take MN CJ7 's advice... He seems to know a thing or two..
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