Peak EOT? - PowerStrokeNation : Ford Powerstroke Diesel Forum
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post #1 of 43 (permalink) Old 12-29-2018, 04:43 PM Thread Starter
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Peak EOT?

Hey Nation, the time finally came to take my new toy hauler out to the desert. Fully loaded down with fuel, water, this, clothes, etc, the truck and trailer gross combined at 20,000lbs. I had all my tire pressure's set, right distribution of weight, and weight distribution hitch installed, airbags at 20lbs and a mildly aggressive towing tune.

I got to driving, and the truck was doing great. On flat ground it had tons of power for passing, cruise control set at 60mph. The test was when I hit the Tehachapi Grade, varying 5-7% grade for about 15 miles with little rest inbetween. I hit the bottom at 70mph in 4th, then at 60 down shifted to 3rd, keeping eye on EGTs, maintaining 1250-1300*, then after a while got down to about 48mph and forced it into 2nd, where the truck screamed at 3000rpms for the last 2-3 miles, maintaining 48mph. Ambient temps were about 50*, trans never got over 165*, ECT were always low on the gauge, BUT, my EOT got waayyyyy high, I saw it peak at 271* at the very top of the hill. It quickly dropped to 240* after about a mile of downhill coasting.

After we got to our destination and off the freeway, the truck was kind of loping around here and there, didn't sound smooth (probably pushed off at me lol). But I got to our camp spot and let it idle for about 15ming, where EOT got down to 200*, and EGT got down to 250* while idling, and I shut her off.

Does anybody think 271* is a little too high? I'm running Delo Isosyn 15w-40 with only about 1000miles on it. Im debating on when I get home I take a sample and send it out to see really how it looks.


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post #2 of 43 (permalink) Old 12-30-2018, 04:17 AM
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Re: Peak EOT?

I can't imagine he EOT getting that high without the coolant temperature getting quite high as well (due to the oil being cooled by the coolant). An oil analysis might help to ease your mind (if it comes back "clean" of course). It's probably fortunate that you were pulling the pass this time of year instead of the heat of summer! Cheers!

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post #3 of 43 (permalink) Old 12-30-2018, 11:37 AM
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Re: Peak EOT?

I agree with Patrick. The coolant temp should of been darn near pegged out. Was the fan roaring? Have the water pump ever been changed?

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post #4 of 43 (permalink) Old 12-30-2018, 03:28 PM Thread Starter
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Thanks guys, when I say ECT was cold, I probably should have said that it was within normal operating range. I had the 203* DS tstat, and I see the gauge get about 3/4 up the gauge, and the t stat will open and it will fall below 1/4 pretty fast, so I know it's working well.

As far as the fan, I wasnt sure, the motor was screaming so loud I couldn't hear it if it was running, but I know those fans can get loud as hell too. Maybe a clutch going bad...

Water pump is original AFAIK, I've owned the truck for 50,000 and I've never replaced it, even after the full rebuild, I put on a new o ring and reinstalled. All the fins looked good and new when I reinstalled it.


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New Motor at 352,000, DieselSite Legendary Trans at 356,000 and many more


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post #5 of 43 (permalink) Old 12-31-2018, 12:47 AM
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Re: Peak EOT?

The reason I asked about the pump is if anyone douched it with rtv.

Does your eot match your outside temp after sitting overnight.

01 f-250, Standard
Rev tech 4" lift, 37" military wrangler Mt tires
KC diy 66, Full force 160/100 and custom tunes from PHP
Banks intercooler and full 4" exhaust, Diy S&B intake
Diy quad feed, Hydra, Isspro boost, pyro, and fuel pressure
3/0 battery cables with military style terminals
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post #6 of 43 (permalink) Old 12-31-2018, 01:38 AM Thread Starter
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Quote:
Originally Posted by Sbluke55 View Post
The reason I asked about the pump is if anyone douched it with rtv.

Does your eot match your outside temp after sitting overnight.
Just checked, truck has sat for 36 hours and ambient temp is 48*, EOT sensor is 52.7*.

Just installed a new motorcraft EOT sensor and harness about 6 months ago


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New Motor at 352,000, DieselSite Legendary Trans at 356,000 and many more


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1983 F150 SCSB Flareside, 302 w/ AOD Trans


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post #7 of 43 (permalink) Old 12-31-2018, 01:53 AM
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Re: Peak EOT?

has anything ever been done to the oil cooler maybe it is partially plugged if the heat can not transfer from the oil to the coolant then the coolant would not increase.


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post #8 of 43 (permalink) Old 12-31-2018, 02:52 AM Thread Starter
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Quote:
Originally Posted by masakimm View Post
has anything ever been done to the oil cooler maybe it is partially plugged if the heat can not transfer from the oil to the coolant then the coolant would not increase.
Brand new motor craft oil cooler when the engine was rebuilt 15,000 miles ago. I was worried about that first, but it can't be bad already?


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1996 Cali F350 CCFB, 7.3 PSD, 2wd SAS, w/ 378,000 miles.
New Motor at 352,000, DieselSite Legendary Trans at 356,000 and many more


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1983 F150 SCSB Flareside, 302 w/ AOD Trans


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post #9 of 43 (permalink) Old 12-31-2018, 11:46 AM
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Re: Peak EOT?

Do you still have the oem radiator? The stock coolant gauge sucks and itís more of an idiot light. While towing my fan comes on and you can definitely hear it.

01 f-250, Standard
Rev tech 4" lift, 37" military wrangler Mt tires
KC diy 66, Full force 160/100 and custom tunes from PHP
Banks intercooler and full 4" exhaust, Diy S&B intake
Diy quad feed, Hydra, Isspro boost, pyro, and fuel pressure
3/0 battery cables with military style terminals
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post #10 of 43 (permalink) Old 12-31-2018, 02:15 PM
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Re: Peak EOT?

Probably not but Just spitballing ideas. That is one thing I don't like bout these trucks is they don't have a coolant temp for the computer.

Sent from my SAMSUNG-SM-G891A using Tapatalk


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Upgrades:
|Bellowed UpPipes|160CC Injectors|Adrenaline HPOP|Rebuilt Turbo 360 Bearing|Custom E-Fuel|Manual to Auto Conversion
|Delete Pedestal|3" Down Pipe 4" Exhaust|Dual Tensioner and Belt|Stainless Steel HPX Crossover|Custom Banks InterCooler
|42 Gal Rear Tank 35 Gal Front Tank |DP Infinity Tuner
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