97 7.3L oil aeration Problem - Ford Powerstroke Diesel Forum
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Old 08-22-2014, 09:13 AM
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97 7.3L oil aeration Problem

Can anyone list all the possible causes of oil aeration on these engines? This has been a chronic problem with this particular vehicle. Here is a list of what I have verified is not the cause:
~ New Melling LPOP
~ Oil always changed with either Delo or Rotela; even tried Fleet right additive
~ No leaking IPR
~ No leaking CPR
~ No oil leaks
~ Very little oil consumption: 157000 mi
~ Oil pickup tube removed, inspected for cracks, and resealed at front housing.
~ HPOP reservoir not draining down.

The conditions I am observing are:
~ The longer it runs the worse the problem becomes.
~ It has never failed to start or died, but it gets worse with longer runs.
~ It is sporadic at times, with it rarely running normally but eventually returning to its general condition.
~ There are bubbles on the dipstick.
~ It roars louder and looses power, although not to the point of failing to move, but fuel consumption increases.

In general, it runs but not to its potential due to air in the oil and I cannot find the source.
What in the wide wide world of sports can be the cause?
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Old 08-22-2014, 12:45 PM
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Not to sound sarcastic, but how much oil do you put in when you change it? 14-15 quarts including filter should be the right amount. I say this only because overfilling can lead to aeration.
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Old 08-22-2014, 12:56 PM
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15 qts puts it at the full mark on the dipstick, with filter change. However I do not rule out overfill as a possible cause as I have not run it low to verify. This being an early 97 year motor, are you or anyone else aware of this being an issue with this model year.
Signed,
Desperate in Wyoming

Last edited by Monegrand; 08-22-2014 at 01:01 PM.
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Old 08-22-2014, 01:00 PM
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^^^^ I was thinking dipstick is damaged, not the right one, not fully seated, etc., and the OP is unintentionally overfilling. Might be worth draining off a quart or so, running low on the dipstick for a while.
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Old 08-22-2014, 01:20 PM
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Better yet, pull the dipstick out and measure it so we can tell you if it's the right one.
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Old 08-22-2014, 02:35 PM
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The dipstick measures 25 7/16" from where it stops at the top of the tube to the tip.
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Old 08-22-2014, 03:06 PM
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Also measure from the top stop to the FULL mark.
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Old 08-22-2014, 04:35 PM
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Sounds like the right one, the top of the full mark should be around 22.5". Another thing I just thought of measuring my dipstick is the tube. If it was replaced with one from a superduty it would be longer and more towards the front of the valve cover. The OBS one should be short, close to level with the lip of the valve cover and further back.

If all that matches up the the oil level is fine so it's more likely a pump aerating the oil than the crank. The HPOP is the only thing left I can think of.
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Old 08-22-2014, 06:57 PM
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The full mark measures 22 5/8" from the top, and the tube is about midway between the lip of the valve cover and the top of the valve cover. Actually, the top of the dipstick handle is level with the top of the valve cover, with the tube located just behind the midpoint on the valve cover, so more towards the back.
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Old 08-22-2014, 08:30 PM
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Can you explain how the HPOP causes the oil to aerate?
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