2004 6.0 coolant leak - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 3 (permalink) Old 08-20-2016, 11:54 PM Thread Starter
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2004 6.0 coolant leak

Hello everyone
I am new to the website although I have been reading lots of threads and was able to fix most of my problems thanks to all of you
I have one problem now I cannot find any post on, and I will start with some history
bought my 2004 F250 6.0 four years ago
last year, I failed smog test due to EGR (I live in California). Had to replace EGR cooler and oil cooler due to problems everyone is aware of
I also replaced the turbo charger
Once I got the truck back, I immediately drained the gold coolant, flushed the system, replaced with red diesel coolant, installed coolant filter
three weeks ago I noticed a leak under the truck. Found it was coolant. It was directly under the pump area, so I thought it was the pump, but pushed it off until I had time to look into it
Meantime I used the truck sparingly, not to make things worse. As of my last use, two days ago, I noticed the leak again but this time is was more under the tranny. still looked like coolant, but being red, I cannot tell if it is one or the other, it feels like coolant. I checked the tranny oil and... t almost looks diluted. not milky, just watered down although there are no water droplets in it, at least not noticeable
today I finally gathered the courage to tackle the water pump and not much to my surprise, the pump doesn't seem to be the culprit
I am finding signs of leak below the drive belt pulley to the bottom left of the tensioner but cannot tell where it is coming from
I took a couple of pictures, saved them as .pdf, but cannot seem to be able to upload them
Any help on this is welcome, both I uploading the pictures or.... in figuring out what is leaking (although I may not want to know....) - Thanks
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post #2 of 3 (permalink) Old 08-21-2016, 03:18 PM
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If you have access to a coolant pressure tester, this would help immensely. Best is to pressurize the cooling system with the engine cold as leaks show up best when everything is cold and contracted and not hot and expanded. Leak could be anything at this point since engine work has been done in past, but I would focus on the center top of the engine block and look at the oil cooler cover and egr cooler short rubber hose, hose is usually blue or orange depending on early or late style. Below is a link from Dieseltech Ron showing this hose.



Jan 03' built 6.0/F250cc4wd trqsft/SCT-tuned by KEM-Performance/Garrett Powermax vg-turbo/blue spring mod/gauges=egt+boost+fuel+SG2/exhaust/airaid intake/DR 4.5 lift/dual bilsteins/315's/greasable ball joints/powerstop/smittybuilt/kc lights/high idle mod/roll-n-lock/Mobil Delvac1 ESP 5W40 with (Archoil AR9100 in the oil) and (AR6200 in the fuel)
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post #3 of 3 (permalink) Old 08-22-2016, 04:40 AM Thread Starter
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Thanks. I don't have a coolant pressure tester but i may have access to one. I will have to postpone for a week or so due to work, but i will try it and let you know how it went. I appreciate the advice
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