Oil sending unit? - JeepForum.com
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post #1 of 13 Old 07-19-2021, 09:06 PM Thread Starter
JonRJackson
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Oil sending unit?

Hey guys, trying to get my 76 CJ5 with 304 v8 up and running. Just bought it about two weeks ago and finding all kinds of stuff like ball point pens in vacuum lines….

Well, finally got her to fire up tonight putting some gas in the carb. There is a small tube coming from the engine just above the oil filter. It runs along the heater lines to under the battery where it stops. When I started it up it spit oil out onto the driveway. Any idea where this is supposed to go?

Thanks I’m advance for the help. I’m an IT guy trying to play mechanic 😁

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post #2 of 13 Old 07-19-2021, 10:56 PM
dmoore_64
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Sounds like it is probably a line for a manual oil pressure gage. Is there a manual gage inside of the cab that does not work?


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post #3 of 13 Old 07-19-2021, 11:36 PM Thread Starter
JonRJackson
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Not sure, 1st time I’ve cranked it over tonight. Looks like factory guage, but I’ll check tomorrow. IF it is, how can I run it without oil shooting everywhere?
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post #4 of 13 Old 07-20-2021, 05:01 AM
John Strenk
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You could remove the line and plug it until you get a new gauge and install a new line.


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post #5 of 13 Old 07-20-2021, 05:17 AM
Axhammer
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The threads for that line, where it attaches to the block or oil filter housing will be pipe thread. You will need a 1/8” male NPT plug to install after you remove the line.
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post #6 of 13 Old 07-20-2021, 05:26 AM
Axhammer
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If you have a mechanical oil pressure gauge, and the supply line is broken, that is most likely a nylon line, and that’s why it’s broke. You can replace it with a copper line that will last longer.

If this is the case you may as well replace it now before you start the engine. This way you will be able to monitor the engine oil pressure on your new Jeep. They are not expense.
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Why do I own a CJ? I like to “Balance the wrench and the steering wheel”
1985 CJ-7 Sebring Red, White hardtop, 284 CID inline six (4.7) TF 999 auto
2020 JLU Black, Black hardtop, EcoDiesel, 35’s on 2” Mopar lift
View my Pontiac in my profile
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post #7 of 13 Old 07-20-2021, 07:36 AM Thread Starter
JonRJackson
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Thanks everyone. I will climb underneath the dash tonight and check out the gauge. I thought that is probably what it was but everything I find shows it to be an electronic gauge.
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post #8 of 13 Old 07-20-2021, 08:03 AM
Matt1981CJ7
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FYI, that hole in the bloke is the original location of the oil pressure switch and oil pressure sender. The switch was used to supply power to the e-choke.

Since you don't have the switch or sender, I suspect your factory oil gauge and e-choke are inoperable.

Matt
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post #9 of 13 Old 07-20-2021, 10:46 AM Thread Starter
JonRJackson
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I think I’m going to stop by the local auto parts store and get a cheap guage and sending unit to put in place until the rebuild. My initial goal is to get it driveable (not necessarily street legal) so I can move it around when needed.

Once it’s driveable, the tub is coming off and everything is getting rebuilt/replaced.
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post #10 of 13 Old 07-20-2021, 07:46 PM Thread Starter
JonRJackson
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Well, this sure looks like an electronic guage to me. Not sure what the PO had in here, but I can’t find any more length of this tube. So bought another manual guage to drop in so I’ll at least have something showing I’ve got oil pressure when I finally get to start this thing.
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post #11 of 13 Old 07-20-2021, 07:56 PM
texasdave
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You can still buy electric oil sending unit for the 308. Just have to mke sure the wire is lurking somewhere. I believe it is purple.
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post #12 of 13 Old 07-20-2021, 08:57 PM
BagusJeep
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With a metal line you need to work out how to stop it fatiguing and fracturing from engine movement.

the best way is to have it fastened securely to block and bulkhead and put a flexible hose in between.

Second best, and especially if you are not going to leave it like that, is to coil the tube just before it fastens to the bulkhead, like a telephone handset used to have. If you are real careful you can gently bend it without kinking round say a small can or bottle, 3 coils are enough. This will reduce the stresses substantially.
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post #13 of 13 Old 07-21-2021, 06:13 PM Thread Starter
JonRJackson
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This engine is getting rebuilt or replaced, not sure yet. But either way it’s coming out. So for now I just bought another nylon hose to replace it with and a cheap gauge so I can see oil pressure when I get it running.

PO must have used a wrench to tighten the oil filter on. Two days of trying but finally got it loose tonight.
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