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Old 05-02-2010, 06:12 PM
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Oil Pump Replacement ?'s

I have some issues. I just replaced my stock 4.0 with a used freshened up 4.0. My oil pressure was always whacky with the old motor and was told that my oil pressure sending unit was bad at one time, thats why the check guages light and low oil pressure was happening. Is an Oil Pressure Switch and the Oil Pressure Sending unit the same thing? I bought an oil pressure switch and paid like 50$. I have read on the forum of people saying to replace the oil pressure sending unit for like 7$ If these two are different then Where the heck is the sending unit. I ordered a new oil pump as well. Are there any major tricks to replacing one. I know to drop the pan and stuff but any other things I will need to do before trying to start it again. I am hoping this solves my low oil pressure problem.

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Old 05-02-2010, 06:23 PM   #2
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As far as I know the switch and sending unit are the same thing. I would do that first before the oil pump. IMO buy an OEM.

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Old 05-02-2010, 08:42 PM
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I did repalce it with an OEM. I guess I will drop the pan and see what the oil pump screen looks like. I drained the oil today and it was thick and dirty but I would expect that with new rings and honed cylinders.
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Old 05-02-2010, 09:18 PM   #4
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No, the oil should be nice and clean if the engine was apart and new rings installed and the cylinders honed. I think you were taken for a ride if they told you the engine was worked on.
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Retired my 94 YJ 4cyl 5spd @ 200K
Now in a 04 TJ 4cyl 5spd CV @120K+
Both as a commuter vehicle in NW, NJ
April 2012.downsized and now a 99er.
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