Question: Coolant leaking passengers side rear - Diesel Place : Chevrolet and GMC Diesel Truck Forums
 
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Duramax Third Generation: 2006-2007.5 (LBZ & LLY) Discuss the third generation (2006-2007.5 LBZ & LLY) of the 6.6L Duramax diesel engine & associated components. 2006 LLY engine discussion also belongs in this forum due to the similarities of the 2006 LBZ and the 2006 LLY. Engine related discussion ONLY.

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Old 03-26-2011, 12:15 AM   #1 (permalink)
DAMSTROKES
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Coolant leaking passengers side rear

Hey. I have a '06 Duramax that keeps showing a small coolant leak at the rear of the passengers side of the block right at the seam where the engine meets the allison. I can't see any of the egr cooler hoses leaking and the heater hoses are all good too. Appears to be dripping from above when cold but like I said can't isolate it. Pressure testing right now. It's been sitting for 15mins and no drop. Engine is hot though so..... Anybody got a suggestion of what to look at? I am a Ford diesel mechanic hence why I bought GM. I love the truck and have plans for performance/appearance upgrades etc but for now I would just like to seal the dam leak. Ideas??? Also I have been reading up on my truck and have confusion.... I learned that the 8th vin # determines what engine I have but my trucks 8th # is D which should make it a LBZ but I have also learned that the LBZ was not introduced till late '06. The build date on the truck is 12/05 which should then be a LLY ..... Can anybody tell me what the deal is. Hoping I got a LBZ.

Last edited by DAMSTROKES; 03-26-2011 at 12:37 AM. Reason: Found more info.
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Old 03-26-2011, 01:56 AM   #2 (permalink)
roy67ss
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Welcome to DP!

If your not leaking from the head gasket, I believe you may have a leak coming from a plate that is on the back of the motor under the turbo down pipe. I had a similar problem that appeared for a couple of weeks. It was very minor and only leaked about a few drops to a table spoon at most. It has stopped on its own lately but I expect it to show again. If you look at the last page of the detailed instructions for the EGR delete kit at this link, you can see the plate held on with 2 bolts behind the head.
http://allseasondieselperformance.co...t-complete.pdf

You have an lbz, they began production in late `05 not `06. That info is wrong.

Oh, and if you`re going to hang around here, you should fill in your signature with all relevant info so help is easier.
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Last edited by roy67ss; 03-26-2011 at 02:00 AM.
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Old 03-26-2011, 10:56 AM   #3 (permalink)
jettech
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The 6th post in this thread shows that plate he's talking about.

plate between motor and tranny?
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Old 03-26-2011, 11:09 AM   #4 (permalink)
dbaskette
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There are 2 holes in the fly wheel housing allowing coolant to circulate. The holes are sealed with rubber/metal o rings. If they are truly bad, it will require a trasmission drop to replace the $4 O RINGS.

Many people will disagree but gm makes a stop leak product that cured mine years ago. They are tablets, and my gm tech said most vehicles come from the factory with this product in the coolant system. I admit to being a bit leary of this, but it worked.
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Old 03-26-2011, 09:59 PM   #5 (permalink)
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Awesome. Thanx guys gonna take a look at the plate on to of flywheel housing as shown in the thread pic.
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Old 04-12-2011, 07:59 PM   #6 (permalink)
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Im experiencing a similar problem. I have a steady stream of coolant coming from the top of the back side of the head gasket but I dont have any of signs that its the head gasket. Wouldnt the leak come straight down from the plate? When the truck is running it flowing fast, when its off and the coolant level is low there is no leak when I fill it to the normal level it starts to flow when engine is off.
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Old 04-12-2011, 08:02 PM   #7 (permalink)
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My truck is a 2006 LBZ and the leak is on the right side (passenger side)
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Old 04-13-2011, 10:08 PM   #8 (permalink)
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It was the egr cooler line to the thermostat
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Old 05-11-2011, 08:53 AM   #9 (permalink)
DAMSTROKES
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Found and fixed the leak. It was that plate on the rear cover. Fun to do actually... Except that i have brain damage and was unable to locate the radiator drain plug so i caught a dexcool shower. Easy enough to sneak out and back in with out removing too much stuff. One trans bolt and the turbo down pipe bracket bolt. Thanx very much for the help.
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Old 05-12-2011, 11:28 AM   #10 (permalink)
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Quote:
Originally Posted by DAMSTROKES View Post
I am a Ford diesel mechanic hence why I bought GM.

Best quote ever. Glad you got the truck running.
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