LB7 Lost Gallon of Coolant - Diesel Bombers



Chevy/GMC Duramax 01-04 LB7 Discussion of Chevy and GMC Trucks with LB7 Duramax Turbo Diesel Engines

Reply
 
 
 
LinkBack Thread Tools Search this Thread
  #1  
Old 04-15-2015, 04:53 PM
Diesel Fan
Thread Starter
 
Join Date: Apr 2015
Posts: 10
Default LB7 Lost Gallon of Coolant

My first duramax isn't going well. I have had to add coolant every time I drive it. Lost gallon in 400 miles. Truck has 191K miles 2003.

First off no coolant leaking on the ground or coming out the overflow vent tube.

When it cools the Upper hose has been collapsed some. System holds vacume even with new rad cap.

system will hold 14 psi with gauge for an hour. Cant find leak anywhere.

Then I noticed water droplets in the oil fill and then I pulled pcv hose and its almost clogged with a gooy substance. So some must be getting into the crankcase.

Now the oil deffently hasn't gained a gallon so I think most is being burned off. The upper hose never is rock hard, no bubbles in the overflow tank. Also checked for exhaust gases in the coolant. was none. also oil look good.

Ive spent days reading on this. But still cant make a decision. Can the injector cups leak coolant into the top of the head? where else can the coolant be going.

Love this site by the way.
Reply With Quote
The Following User Says Thank You to duramax on fire For This Useful Post:
  #2  
Old 04-15-2015, 04:56 PM
Diesel Fan
Thread Starter
 
Join Date: Apr 2015
Posts: 10
Default

The two pics are the goo taken from the pcv hose
Attached Thumbnails
LB7 Lost Gallon of Coolant-img_0567.jpg   LB7 Lost Gallon of Coolant-img_0565.jpg  
Reply With Quote
The Following User Says Thank You to duramax on fire For This Useful Post:
  #3  
Old 04-16-2015, 07:31 PM
RanchhandTCR's Avatar
Diesel Bomber
 
Join Date: Sep 2011
Location: SLV Colorado
Posts: 2,049
Default

Well first it not vaccum on the cooling system its pressure, I would start it and drive and see what your pressure builds up to. Your injector cups are not surrounded by water so no, and since you dont have a gallon of water sitting in your sump, its most likely a head gasket which duramaxs are notorious for.. If you put a gauge on the cooling system and start it and it builds 15psi uber fast you have compression in you coolant, you may not see any exhaust gases because there is very little pressure in the cylinder on that cycle, but where it builds is on the compression cycle, it may not be much but enough to put water in your oil.
Reply With Quote
The Following User Says Thank You to RanchhandTCR For This Useful Post:
  #4  
Old 04-17-2015, 09:19 AM
Diesel Fan
Thread Starter
 
Join Date: Apr 2015
Posts: 10
Default

Ranchhand, I said it would pull a vacuum after cooling and it would pressure test 14 lbs PSI.

Also the system is not building pressure. Upper house stays soft.
Reply With Quote
The Following User Says Thank You to duramax on fire For This Useful Post:
  #5  
Old 04-17-2015, 10:34 AM
Diesel Fan
Thread Starter
 
Join Date: Apr 2015
Posts: 10
Default

well took valve covers off. Not sure what to do. The top of the heads were clean. But a lot on the covers. Couldn't see any evidence of the cups leaking. All glow plugs had some carbon built up so I don't think its burning it. I cleaned the valve covers off and put all back togather. The PCV system was stopped up completely. I have it dumping onto the ground know instead of the oil pan. Going to drive it for a couple more weeks and keep better track of the coolant lost.

Has anybody had good or bad experience with Blue Devil sealant .
Reply With Quote
The Following User Says Thank You to duramax on fire For This Useful Post:
  #6  
Old 04-17-2015, 10:35 AM
Diesel Fan
Thread Starter
 
Join Date: Apr 2015
Posts: 10
Default

the pics
Attached Thumbnails
LB7 Lost Gallon of Coolant-img_0586.jpg   LB7 Lost Gallon of Coolant-img_0585.jpg   LB7 Lost Gallon of Coolant-img_0587.jpg  
Reply With Quote
The Following User Says Thank You to duramax on fire For This Useful Post:
  #7  
Old 04-22-2015, 12:08 AM
RanchhandTCR's Avatar
Diesel Bomber
 
Join Date: Sep 2011
Location: SLV Colorado
Posts: 2,049
Default

You are getting water into you coolant, and I appologize for your miss understanding, but if that is what is lubricating you engine at this moment, you will end up with a bigger repair bill. You have to have a bad headgasket. If it does not build pressure what so ever. Have you actually put a gauge on the coolant system at the recover tank? If its not the head gaskets its an oil cooler but you would have a coolant system full of oil if that was the case.
Reply With Quote
The Following User Says Thank You to RanchhandTCR For This Useful Post:
  #8  
Old 04-24-2015, 12:58 PM
Diesel Fan
Thread Starter
 
Join Date: Apr 2015
Posts: 10
Default

well just giving an update. Still loosing coolant. Pulled valve covers back off and they were covered again. Went ahead and took heads off and sent them to the machine shop to get pressurized. But I didn't really see anything wrong with the head gaskets. One piston was lighter than the others. I don't know whats wrong.
Reply With Quote
The Following User Says Thank You to duramax on fire For This Useful Post:
  #9  
Old 04-25-2015, 02:54 PM
Diesel Bomber
 
Join Date: Dec 2010
Location: Fool's Golden State
Posts: 1,187
Default

Photos of the pistons and gaskets?
Reply With Quote
The Following User Says Thank You to 2004LB7 For This Useful Post:
  #10  
Old 04-25-2015, 03:43 PM
Diesel Fan
Thread Starter
 
Join Date: Apr 2015
Posts: 10
Default

Pic
Attached Thumbnails
LB7 Lost Gallon of Coolant-image.jpg  
Reply With Quote
The Following User Says Thank You to duramax on fire For This Useful Post:
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Is it possible a bad intake manifold Gasket can cause coolant loss caissiel Ford Powerstroke 03-07 6.0L 1 09-24-2015 06:37 PM
Coolant level Rayrock4 Ford Powerstroke 03-07 6.0L 0 08-30-2015 10:45 PM
Lost mpg on my LB7???? Back-in-Black Chevy/GMC Duramax 01-04 LB7 0 11-29-2014 01:40 AM
Coolant in oil and oil in coolant 97f-250 Ford Powerstroke 94-98 7.3L 0 11-23-2014 09:08 PM
Coolant in Oil, But NO oil in coolant. Maybe waterpump?? gmcmanis Chevy/GMC Duramax 01-04 LB7 0 11-09-2014 05:49 PM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -5. The time now is 07:03 AM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.