Replacing Duramax LB7 Injectors 01-04 tips and hints
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Super Moderator
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From: Houston, Tx
I am currently tearing down my '01 LB7. When I removed the upper valve cover, I found most of the fuel inlets to the injectors caked in crud. One was so caked, I'm sure there was NO fuel getting to the cylinder. Is this a sign to replace the injectors? (obviously the fuel filter died at some point in the truck life)
you will have to glass bead blast it if its bad or replace them. and they arent cheap
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Super Moderator
Joined: Oct 2007
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From: Houston, Tx
I am currently tearing down my '01 LB7. When I removed the upper valve cover, I found most of the fuel inlets to the injectors caked in crud. One was so caked, I'm sure there was NO fuel getting to the cylinder. Is this a sign to replace the injectors? (obviously the fuel filter died at some point in the truck life)
more info about it.
https://www.dieselbombers.com/chevy-...r-service.html
Newbie
Joined: Dec 2009
Posts: 5
Likes: 0
From: Austin Texas
Great site and a great post on this topic.
I think I am going to tackle this in the next few weeks but I have some questions......
1. should I purchase the injector removal tool?
2. Is it best to drain the coolant first?
3. Is there a diagram of what injectors are on what side? I have been told that #6 is leaking (-4.1 mm3) and was going to start with that one or should I just bite the bullet and do them all? 2001 with 120K on it. One of the injectors on the drivers side has been done before, but I have no idea which one.
Thanks
---AutoMerged DoublePost---
One more question.
How do you and should you bleed the pressure from the fuel system before you start the process of removing the fuel lines?
I think I am going to tackle this in the next few weeks but I have some questions......
1. should I purchase the injector removal tool?
2. Is it best to drain the coolant first?
3. Is there a diagram of what injectors are on what side? I have been told that #6 is leaking (-4.1 mm3) and was going to start with that one or should I just bite the bullet and do them all? 2001 with 120K on it. One of the injectors on the drivers side has been done before, but I have no idea which one.
Thanks
---AutoMerged DoublePost---
One more question.
How do you and should you bleed the pressure from the fuel system before you start the process of removing the fuel lines?
Last edited by Sinman; Dec 28, 2009 at 10:32 AM. Reason: Automerged Doublepost
Thread Starter
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Super Moderator
Joined: Oct 2007
Posts: 14,872
Likes: 764
From: Houston, Tx
Great site and a great post on this topic.
I think I am going to tackle this in the next few weeks but I have some questions......
1. should I purchase the injector removal tool?
You shouldnt need a removal tool for the injectors, i have always used a prybar using a head bolt as a fulcrum point
2. Is it best to drain the coolant first?
Yes, if you happen to pull an injector cup the coolant will go in you cylinder
3. Is there a diagram of what injectors are on what side? I have been told that #6 is leaking (-4.1 mm3) and was going to start with that one or should I just bite the bullet and do them all? 2001 with 120K on it. One of the injectors on the drivers side has been done before, but I have no idea which one.
#6 would be on the driver side third on back
Thanks
---AutoMerged DoublePost---
One more question.
How do you and should you bleed the pressure from the fuel system before you start the process of removing the fuel lines?
There isn't enough pressure built up in the lines to do any damage when you remove them when the truck is off
I think I am going to tackle this in the next few weeks but I have some questions......
1. should I purchase the injector removal tool?
You shouldnt need a removal tool for the injectors, i have always used a prybar using a head bolt as a fulcrum point
2. Is it best to drain the coolant first?
Yes, if you happen to pull an injector cup the coolant will go in you cylinder
3. Is there a diagram of what injectors are on what side? I have been told that #6 is leaking (-4.1 mm3) and was going to start with that one or should I just bite the bullet and do them all? 2001 with 120K on it. One of the injectors on the drivers side has been done before, but I have no idea which one.
#6 would be on the driver side third on back
Thanks
---AutoMerged DoublePost---
One more question.
How do you and should you bleed the pressure from the fuel system before you start the process of removing the fuel lines?
There isn't enough pressure built up in the lines to do any damage when you remove them when the truck is off
Newbie
Joined: Dec 2009
Posts: 5
Likes: 0
From: Austin Texas
So I planning on doing this in the upcoming weeks and was wondering.....
I seem to only have one bad injector (#6) and was wondering if there would be any issue with only replacing that one instead of doing all 4 on that side? I know that since I am in there it would be good to do, but at $300 each I dont want to replace a an injector when it really does not need to be replaced.
Any comments?
I seem to only have one bad injector (#6) and was wondering if there would be any issue with only replacing that one instead of doing all 4 on that side? I know that since I am in there it would be good to do, but at $300 each I dont want to replace a an injector when it really does not need to be replaced.
Any comments?
Thread Starter
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Super Moderator
Joined: Oct 2007
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From: Houston, Tx
balance rate test or a fuel return rate test will have to be done to see what else is going on.
when my injectors first went out i had a p0087 also
Thread Starter
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Super Moderator
Joined: Oct 2007
Posts: 14,872
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From: Houston, Tx
no problem with that, you have to make sure to vacuum out the corrosion thats flakes off of the contact points in the high pressure fuel lines and collects in the high pressure inlet of the injector. spend extra time on trying to vacuum them up cause it is alot of work to have something mess up and for you to dig back down there again.
