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Unread 04-12-2010, 09:16 AM   #1
apaol002
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OIl Pressure Reading

I have a 90 YJ with a 4 banger in it and I am wondering if anyone can point me in the right direction. What is the gauge suppose to read normally for oil pressure? Any help would be appreciated.

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Unread 04-12-2010, 09:38 AM   #2
rustywrangler
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It varies by rig. What does yours say???

The general rule of thumb is 10 PSI for every 1000RPM's. So you can have a rig idle as low as 10 PSI and be upwards of 70PSI at speed. Generally, between 20 and 60 is the norm.

Again, what does yours say???
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Unread 04-12-2010, 11:19 AM   #3
RebuildRookie
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Rusty is right.

Just for the record mine runs about 65 (consistantly) after an oil change, and it lets me know when it needs another. It will drop to 40 while driving and a little lower (20 or so) at idle.
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Unread 04-12-2010, 06:39 PM   #4
apaol002
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Thanks everyone for the input first off. My oil pressure gauge reads anywhere between 40 and 60 when idling. When I give it gas and get some speed it reaches somewhere around 80 - 85. I am just wondering if this is normal or not. I hate seeing the needle go back and forth so much, it makes me nervous. I just want to know if this is normal or should I start looking for a problem, and if so, where do I look?

Thakns again.
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Unread 04-12-2010, 07:14 PM   #5
rustywrangler
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The needle will ALWAYS move.

What weight oil are you running and where is the oil level on the dip stick when cold??? That pressure is ok, not great but ok.
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Unread 04-12-2010, 07:48 PM   #6
Wheelman286
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It will stay at 50-60 all the time if you put Lucas oil stabilizer in it. That's what mine does. Otherwise, 40 at idle, 50-60 when you're going down the road at speed... usually... as others have said the gauge accuracy is questionable. 80... you might want to check on that.

I bought an 87 MasterCraft Prostar 190 (ski boat) with a 351 Windsor in July '09 and my oil pressure would go to 80 and sometimes max out the gauge (almost 100). There was gas in the oil, so we (me and the old man) took the top of the motor apart and the main gasket was bad and there were a few loose bolts too. Amazingly it ran just fine but how long it would have continued to run in that state is a question I'm glad I never found an answer to.

That boat has VDO gauges though which are incredibly accurate unlike the gauges in YJs. So It could be the gauge but it might not be. Check to see if there's gas or god forbid... water... in your oil. That's how we found out with the boat.
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Last edited by Wheelman286; 04-12-2010 at 09:33 PM..
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