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Duramax Fifth Generation: 2011-2016 (LML) Discuss the fifth generation (2011-2016) of the 6.6L Duramax diesel engine & associated components. Engine related discussion ONLY.

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Old 11-16-2014, 01:24 PM   #1 (permalink)
GM4Life86
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Coolant Leak from above oil filter area! Advice Needed Please

Alright everyone! As you may know I have a 2011 LML with 69X,XXX miles on it. Few weeks back i had to replace the TCM. When it crapped out the truck went into limp mode while driving and there was a harsh what seemed like downshift! Ever since that happened i have had a small coolant leak. Now it has turned into a sizable amount that leaks just over night. I have search the engine bay meticulously and have not seen any hose or anything with signs of a leak. So i am looking underneath the truck and notice the area right above the oil filter is soaked with coolant! I am unable to pin-point the exact location. So if anyone could kindly inform me as to what the possibilities in that area could be? Water pump is dry as well with no leaking! Thanks in advance everyone!

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Old 11-16-2014, 03:19 PM   #2 (permalink)
TheBac
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Oil cooler o-ring or the adapter's seal to the rear cover failed. Do you have coolant in the oil? That would indicate the cooler failed internally (hope not).

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Old 11-16-2014, 03:30 PM   #3 (permalink)
GM4Life86
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Thanks Bac! I have not noticed any coolant in the oil. I have checked oil and trans fluid recently even checked oil again the other day and it checks out good Did notice a small leak from the oil pan. But that i can tell is the gasket needing replaced . I will check on the oil cooler for sure. I purchased a Dmax manual the other day so i will have to look up the cooler to find out the difficulty level of removing it.
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Old 01-08-2015, 10:15 PM   #4 (permalink)
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Alright Bac, I finally order the Engine oiler cooler. I had the truck looked at a few weeks back and they confirmed it was the cooler. quoted me $1100 for the work.280 for the Cooler itself. 650 just for labor. then the rest is all the misc fluids and gaskets needed for the cooler since it only comes with 2 gaskets. I actually order the Cooler on amazon for $125 NIB. Got the last one they had too!! I was looking under the truck today to see if i could do the work. It doesn't seem to bad. There are a couple bolts that look like they would be a pain in the *** to reach but they rest seems simple enough. Manual makes it sound easier then what it looks though as usual. Have you had any experience removing/installing one of these?
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Old 01-08-2015, 10:38 PM   #5 (permalink)
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$1100?!? Pardon me if I faint.

The only time I messed with my oil cooler was when the engine was out, but it should be accessable from underneath (like changing the filter). I do know you really have to watch installing that elbow correctly.

This should help:
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"BBT" -- 2003 GMC 2500HD CC/SB 4x4 - 12.14 @ 111.15
"Kleshay" -- 2000 C5 Corvette -- the toy
"The Cruzer" -- 2014 Chevy Cruze Diesel -- the DD

Marlene (Molly) Bacon -- 1936 - 2019 -- RIP Mom
You're missed both at home and on the piano

Success is getting what you want. Happiness is wanting what you get.
Reality is a matter of perspective.


Last edited by TheBac; 01-08-2015 at 10:40 PM.
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Old 01-09-2015, 05:31 PM   #6 (permalink)
GM4Life86
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Yea i about passed out myself when he told me that price! I tried to look up the link you shared but i do not have the "Privilege" to access it. Haha
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2011 Silverado CCLB 4x4 Duramax w/ 740,500 Miles, S&B Intake, EFI Live/MotorOps, DP Back Flo-Pro 4" straight pipe, EGR Disabled, 275/70/18 GreenBall Trail Hog Tires. Daily Driver

https://www.dieselplace.com/forum/63-...ld-begins.html <---My Build Page!

2001 Sierra 1500HD CCSB SOLD
2007 Impala Full Magnaflow Exhaust-Sold To Mom
2003 Silverado Z71--SOLD
1998 Chevy Blazer--SOLD
1996 Chevy Caprice 5.7--Totalled
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