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Old 04-22-2016, 07:20 AM   #1
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8.3 oil pressure

when i start my motor the oil pressure is 70 80. after it gets hot it drops to 20. on high idle it goes up over 50. is this normal? is this one of the reasons to use high idle? im droping the pan soon to do a gasket change on the motor, should i put a new oil pump in it anyway? thanks
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Old 04-22-2016, 11:17 AM   #2
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Inspect it for wear and any other abnormalities. A service manual should describe clearances and inspection for you. But what you have sounds fine to me.
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Old 04-22-2016, 11:17 AM   #3
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How many hours on engine, what type oil are you using? Sounds more like normal wear than anything. Maybe send off an oil sample, to be sure nothings going on.

Pretty much oil pressure is oil pressure. Either you have it or you dont. Lots of variables.

Oil pump is on the front of the engine.
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Old 04-22-2016, 09:24 PM   #4
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Quote:
Originally Posted by opus View Post
How many hours on engine, what type oil are you using? Sounds more like normal wear than anything. Maybe send off an oil sample, to be sure nothings going on.

Pretty much oil pressure is oil pressure. Either you have it or you dont. Lots of variables.

Oil pump is on the front of the engine.
bingo, i lost two quarts on the way to il. and then i lost over a gallon on the way home. i thought it was the timing chain cover. i bought the entire engine gasket set so i guess i got it covered. thank you . it has 161000 and i forget the hours.
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Old 04-22-2016, 09:26 PM   #5
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Ebay for an oil pump. Find out the hours, curious to know.
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Old 04-23-2016, 08:18 PM   #6
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new pump on the way. 3289 hours. i was going to take everything i can off the front of the motor, is there anything i need special besides a puller? i got my test kit in the mail, think ill wait and fix the leak before i send it off. its got alot of new oil in it.
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Old 04-23-2016, 08:25 PM   #7
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That's not many hours at all.

You shouldn't need any special tools.

I'm thinking that when it's all said and done, you'll have the same oil pressure as you have now.

Does the back oil gauge have the same readings?
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Old 04-23-2016, 08:51 PM   #8
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looks like i wont have to "pull" the harmonic balancer.
Attached Images
File Type: jpg 8.3 timing (653 x 490).jpg (75.4 KB, 11 views)
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Old 04-23-2016, 09:01 PM   #9
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more often than not lower oil pressure is caused by looser clearances on bearings and parts in an engine than it is the oil pump..

engines age, things get loose... 20 PSI at idle on a Hot engine doesnt sound bad to me esp if the idle is at 600-700 RPM or lower..

you CAN put a higher VOLUME oil pump in if you think you are not running enough oil through your engine..

80 doesnt sound bad if you are running it up to 2500 RPM or so when its cold

there is a pressure regulator but thats rarely the issue.. though something to look at..

the main thing is to get the leak fixed and then not to run low pressure when you are into the throttle hard as thats when the turbo needs the most oil.. you definitely dont want to oil-starve the turbo!

-Christopher
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Old 04-23-2016, 09:20 PM   #10
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yes i agree, ill post pics of where the oil is coming from, its at the top of the timing cover. next sunday is the big day, ill take lots of pics.
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