Coolant leak from bottom of bell-housing! - Chevy and GMC Duramax Diesel Forum
06-07 LBZ & LLY Duramax Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission, Etc.

 
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post #1 of 9 (permalink) Old 04-04-2019, 03:48 PM Thread Starter
 
Join Date: Jan 2014
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Unhappy Coolant leak from bottom of bell-housing!

Hi there, hoping to get some advice/answers on this puzzling issue...

A few days ago my 06' GMC LBZ began showing "Low Coolant Level" on the DIC (Driver Info Center), but the coolant temp was showing normal (195 degrees), so I checked the coolant reservoir and sure enough it was empty? I always check my fluid levels weekly and was surprised to see no coolant... so I poured in 1 full gallon of DEX/COOL coolant and drove the truck about 30 minutes. To my surprise the "Low Coolant Level" warning came back?
I then noticed some coolant dripping from under the truck and crawled underneath to see where it was dripping from.... coolant was dripping from the transmission weep hole near the front of the bell-housing! I poured in more coolant and sure enough it dripped out as fast as I poured it in!
Now I have not seen a bare Duramax block, but I am familiar with the older Chevy V8's that had coolant freeze-plugs in the rear of the block, but does the Duramax have the same thing?
Every time I put in more coolant, it drains out (usually when driving) but the engine never runs warmer than normal 195 degrees...then the "Low Coolant Level" warning comes on again.
I spoke with one guy and he said the Duramax has "Cover Plates" on the rear of the block that could be the source of the leak?
So far no one has been able to give me a definitive answer on what the problem is and what the repair will be. Hoping someone on this forum can help me out.
Thanks for taking the time to read this,
Chris
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post #2 of 9 (permalink) Old 04-04-2019, 03:57 PM
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There are several coolant lines up top that will run down to where you see. Best to pressure test the system for a look see.

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post #3 of 9 (permalink) Old 04-04-2019, 04:00 PM Thread Starter
 
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I have checked all around the block, heads, coolant lines/hoses and no leaks from those areas, just at the seam of the block and transmission... has me baffled!
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post #4 of 9 (permalink) Old 04-04-2019, 04:07 PM Thread Starter
 
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I have attached a photo of the bottom of the engine/transmission (see coolant drip that came from the weep hole).
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File Type: jpg 20190330_092527[1].jpg (38.0 KB, 39 views)
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post #5 of 9 (permalink) Old 04-04-2019, 04:19 PM
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Did you feel the underside of the hose feeding the heater core @ the firewall?
Plastic quick connect hose barb fitting is known to crack, and leak straight down, not seen.

Looks like your wet spot is on the pass side, so this ^ is something to check.
The other on that side is the feed to the EGR cooler, down under the intake tube and hard to see.

2007 LBZ 3500 LT3 DRW Crew Cab, Sulastics, Putnam XDR 15K, B&W 30K-Turnover GN+Companion, Ride-Rite Air...EFI'd by Rob
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Use-ta Haves 2006-6.0 3500 WT DRW ExCab Flatbed, 2005-LLY 3500 LS DRW Crew Cab, 2002-LB7 3500 LS DRW Crew Cab
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post #6 of 9 (permalink) Old 04-04-2019, 04:22 PM Thread Starter
 
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Yes I checked the hoses, side of the block, valley area and no external leaks....only leaking from the machined surfaces of engine block and transmission... the drop of fluid ran to the low side as I was parked, but came from the trans weep hole.
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post #7 of 9 (permalink) Old 04-04-2019, 04:31 PM
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Turbo coolant inlet (119)? Seal (117)
and the return line (120)? Seal (121)

Sry, can't think of anything in the bell housing that's coolant related. Must be above and leaking down.
Attached Images
File Type: jpg LBZturboCool.jpg (45.1 KB, 39 views)

2007 LBZ 3500 LT3 DRW Crew Cab, Sulastics, Putnam XDR 15K, B&W 30K-Turnover GN+Companion, Ride-Rite Air...EFI'd by Rob
2008 LMM 3500WT DRW Crew Cab, 8 'Flat/GN, Workforce Alum Toolbox, Ride-Rite Air

Use-ta Haves 2006-6.0 3500 WT DRW ExCab Flatbed, 2005-LLY 3500 LS DRW Crew Cab, 2002-LB7 3500 LS DRW Crew Cab
I Live my life in such a way that when my feet hit the floor in the morning...Satan shudders & says "Oh shit, he's awake!"
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post #8 of 9 (permalink) Old 04-08-2019, 06:24 PM Thread Starter
 
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Yep I thought it may be leaking down from the valley area, head gasket, coolant hose, etc. but the only place it is dripping fluid from is the weep hole on the transmission bell-housing... No wet areas on the sides of the block anywhere!
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post #9 of 9 (permalink) Old 06-12-2019, 06:45 AM
 
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Did you ever get to the bottom of this? I have a similar issue.
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