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Post by willys2point3 on Jan 14, 2021 10:26:39 GMT -5
What would be considered "normal" oil pressure PSI on a 2.3, cold and warm? Mine is nearly pegging my oil pressure guage, seems to run between 75-100PSI assuming my guage is correct. This is an engine that had not run in probably 7 years until just a couple weeks ago. I'm a little concerned about blowing out seals, and not sure of other possible implications. My sending unit is mounted with a 90-degree bend coming out of the head, could that cause inaccurate reading?
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Post by Stinger on Jan 14, 2021 16:53:20 GMT -5
That's way high. Your bypass spring in the pump is probably stuck.
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Post by willys2point3 on Jan 14, 2021 18:08:57 GMT -5
You meant 'stuck' I assume? *sigh*... at least in this jeep I have uninhibited access to the oil pan, I can probably drop it right out the bottom.
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Post by Stinger on Jan 14, 2021 20:21:57 GMT -5
Correct.
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Post by willys2point3 on Apr 18, 2021 18:53:18 GMT -5
I'm still working on this oil pressure issue, I thought if the check valve was stuck that it might fix itself by cycling through some fresh oil with Seafoam added. It still consistently reads 100+ when the engine is cold, and sometimes drops down around 60-70 when the engine is hot. I finally broke down and pulled the oil pan today (which is stupid easy on the jeep, nothing in the way!) To my surprise the bottom end is very clean. No sludge in the oil pan even though I'm pretty sure it has never been off the engine before since '93. I disassembled the oil pump and it basically looks like new. The check valve moves freely. I'm going to put it back together as soon as I get a replacement oil pan gasket, but I'm not expecting any difference since I didn't really change anything.
Now I'm thinking maybe my gauge is just incorrect. Can anyone think of other causes for such high oil pressure, assuming the gauge is accurate?
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Post by Stinger on Apr 18, 2021 19:25:29 GMT -5
The oil pump dictates oil pressure (along with bearing clearances and such). If the pump is fine then I'd certainly suspect a faulty gauge.
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brad
Boosting 15 psi
Posts: 74
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Post by brad on May 4, 2021 8:42:54 GMT -5
I posted this on another site. Check the oil sending unit.
Here's something I would not have expected. When I bought my '87 TC it had 113k miles and showed the classic signs of a worn engine (bearings). The oil pressure was mid-gauge when cold and at idle and then would drop to near zero when hot and at idle. At highway speeds, the pressure showed mid-gauge. However, when I torn the engine down and inspected everything, it looked great. I also have the maintenance records which show the one-owner changed the oil every 2000 miles. So I left the original bearings and oil pump in place.
As expected, nothing changed after installing the engine. The gauge worked as it did originally but I didn't believe it. So installed a new Motorcraft E4ZZ-9278-A oil sender and now it reads perfectly normal. The gauge is just above mid-point and only moves up and down about 1/8 of an inch from cold, to hot, to highway, to idle. I would not have expected a bad sender to work the way it did.
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