Delta ? - Ford Powerstroke Diesel Forum
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post #1 of 17 Old 11-18-2016, 09:27 AM Thread Starter
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Delta ?

I was checking my deltas on my new to me f250, it's been bone stock it's whole life and has 186,000 on it now. I was towing my boat that's about 4500 fully loaded at 65-70mph my deltas went up to 19deg but would come back down to 12-14 range my question is should they never go over 15 or is it ok to go over then come back down
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post #2 of 17 Old 11-18-2016, 09:32 AM
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If the truck was not completely warmed up it will go well past 15*. Sounds like your truck warmed up and they came back down to me.


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post #3 of 17 Old 11-18-2016, 09:41 AM
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The 15 degree delta should be checked when driving unloaded, around 2000 rpms, on flat ground, for a decent amount of time, at fully warmed up temp.

Even still, i wouldn't be happy seeing a 19* difference in temps towing my boat(8300 loaded).

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post #4 of 17 Old 11-18-2016, 09:43 AM
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The test should be done unloaded, not towing, at ~65mph (~1900 RPM) on reasonably flat roads after reaching operating temp. Observe the temps for 10-20 minutes and average out the numbers (though they should stay fairly consistent).

19° towing that light would probably be a cause to check more accurately while not towing, per the above instructions.

@K9Gunner mentioned that the delta might go past 15° as the engine warms up, but that is of no concern. First, that would be a negative delta. Meaning that the coolant was actually warmer than the oil which is not a problem at all while warming up. The number you are worried about is how much warmer the oil gets over the coolant temp after operating temp.

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post #5 of 17 Old 11-18-2016, 09:53 AM Thread Starter
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Ok well my drive to work is a hr plus been monitoring the last few weeks I never get more than 7deg difference
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post #6 of 17 Old 11-18-2016, 09:56 AM
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Sounds like you need to check your wheel bearings, tires, and brakes on that trailer.

Either that, or your 65-70 was really 75-80 uphill.

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Originally Posted by djmaguire View Post
So says the internet... ...and so it shall be.
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OK, thanks for the info. To show my ignorance, what is the problem with 3 nipples...
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post #7 of 17 Old 11-18-2016, 09:58 AM Thread Starter
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Delta ?

Trailer is good rebuilt last year, the speedo might be off and I live in the south so not to many hills here
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post #8 of 17 Old 11-18-2016, 10:01 AM
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Well, as long as the fan is working on your truck and the fluid is topped off... drive on driver.

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So says the internet... ...and so it shall be.
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OK, thanks for the info. To show my ignorance, what is the problem with 3 nipples...
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post #9 of 17 Old 11-18-2016, 10:04 AM Thread Starter
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Delta ?

I didn't pay to much for the truck trying see if I should replace the oil cooler and do a EGR delete to it or just wait till a get a head gasket issue. I already did a 4" straight pipe
I have 8700$ in the truck
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post #10 of 17 Old 11-18-2016, 11:03 AM
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If it aint broke...

EGR leaking? Coolant spitting? White smoke? Running hot(temps never stated)? If not, as Heavy said, drive on.
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