i need an expert to set me straight... - Ford Powerstroke Diesel Forum
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Old 04-09-2013, 03:46 PM
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i need an expert to set me straight...

ok i have replaced my oil cooler and installed an egr delete from synister diesel. ive installed a coolant filter, im running zerex extreme heavy duty coolant, have an edge cts to keep an eye on things.

now for where im probably wrong, i know i did a coolant flush before i had my cooler changed, (this was at the end of last summer) ive put maybe 3000 on the clock since then. before i had all this work done my temps were way out of wack, then i had the work done and everything was looking good, truck runs great, temps look good all the time (ofcoarse its winter) now the weather is starting to warm up and my temp look all screwy again. eot is about 200-205 and ect is usually about 179-182. now obviously thats a big spread for just having all this work done. or so i think... heres where im confused..i thought that if your coolant temp was higher than you oil temp by 15 or more deg that you were up the creek and needed a new cooler. is this right or does it not matter which temp is higher? obviously everyones truck is gonna be a little different but what is the norm? i somehow think my coolant is running too cool but since when is that ever a problem? hope this helps more than just me
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Old 04-09-2013, 04:04 PM
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Oil Temp shouldn't exceed Coolant Temp by more than 15 degrees. EOT will almost always be higher than ECT. Your coolant reading is a little low, I dont know what your ambient temps are where you live right now, but I would suspect that your thermostat is starting to show some issues. Thermostats are supposedly set to start to open at 192. As they start to fail you will notice the coolant temp start to fall under normal operating conditions. The delta cant be read accurately unless the coolant temp is above 185 degrees.
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Old 04-09-2013, 04:14 PM
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^^ what he said. Need to replace your t-stat and then get some readings. Looks like its stuck wide open.


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Old 04-09-2013, 04:39 PM
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ok, ill start there... so what is the down side to your coolant being too cool?
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Old 04-09-2013, 04:46 PM
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In any case, if that is steady-state, your oil cooler is almost clogged again. The good news is you may be able to back-flush the coolant side without removing it. It might be worth a try.
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Old 04-09-2013, 05:05 PM
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what do you mean "steady state"? what symptoms differenciate a stopped up cooler vs a open t-stat? and why the hell would it be stopped up again? if it is it will be for sale.
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Old 04-09-2013, 05:31 PM
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Up to near normal temps on a flat surface, empty at 60-65mph for 5-10 minutes. The differential for the oil temperature will be fairly similar from about 175-200 ECT. I knew my T-stat was opening and running low. My delta was 8* whether the ECT was 175 or what ever. When I replaced my T-stat, ECT 190, the EOT was still 8* warmer.

The second clogging is somewhat normal. Do a search and see how many others have had this happen. The coolant system has to be really clean or disturbing the system will put new (no longer stuck to the sides) debris into the coolant.

Last edited by twoicebergs; 04-09-2013 at 05:36 PM.
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Old 04-10-2013, 05:11 AM
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ok, just as a liitle background info, when i did my coolant flush i ran 45 gallons of distilled water through it. the first id say 20 gallons were just horrible looking then each jug got progressivly lighter, by the time i got to #45 the water coming out was as clear as what was going in... with no change in temps i had my cooler replaced. i just cut open my coolant filter this morning and there is hardly anything in it. this is the second filter iv had on the truck since work was done. first filter was gross, this one (#2) is fairly clean, little dark brown gritty substance it in but no brown slime like the old cooler had. i think im gionna shoot for a new t-stat first and see what happens. start at the cheapest point they say...then ill get some more numbers. i shall return.... thankyou
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Old 04-10-2013, 09:23 AM
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Quote:
Originally Posted by terry6.0 View Post
ok, ill start there... so what is the down side to your coolant being too cool?
Inefficient combustion process, possibly lack of mpg, increased soot, and possibly dirtier oil.

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Old 04-11-2013, 02:38 PM
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Yea change that thermostat and see how it does. Make SURE you put a OEM one in there ONLY.
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