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

LB7 tear down

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  #91  
Old 12-06-2013, 03:31 PM
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I couldn't even get the plug out it broke on the driver side plug trying to get it out
 
  #92  
Old 12-06-2013, 05:02 PM
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i used a harbor freight bit and it worked fine. it was tight but got it out
 
  #93  
Old 12-06-2013, 08:28 PM
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so I guess I need to get a new bit and then continue?
 
  #94  
Old 12-07-2013, 01:24 AM
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sounds like it. if any of the unfiltered fuel make it into the rails you dont want that to be pushed into the brand new injectors you just installed. better play it safe.
 
  #95  
Old 12-07-2013, 10:03 AM
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ok thanks. should I spray them with PB blaster or something and let em soak till I get another bit?
 
  #96  
Old 12-07-2013, 03:19 PM
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I used an impact torx bit a T50 and it mess up. so what size is it and is it left hand threads?????
 
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  #97  
Old 12-08-2013, 02:48 AM
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right hand threads for sure. i dont think any kind of penetrant oil will do any good on this

if i remember right, i believe when i took mine out i used a 3/8 drive ratchet and pulled on it while tapping an inch or two up from the head of the ratchet with a small hammer and it popped and started tuning. just put steady pressure on the wrench while hitting it in the direction you are trying to turn it.
 
  #98  
Old 12-08-2013, 09:58 AM
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alright I'll try that today thanks man
 
  #99  
Old 12-10-2013, 04:10 PM
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I can't get ether plug up the driver side won't come lose for nothing and the passenger sides under the egr cooler I can't go to it. could I just take all 8 injector lines lose on the rails?
 
  #100  
Old 12-10-2013, 05:05 PM
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you can but i dont think you necessarily need to remove all eight injector lines. the purpose was to flush out any junk that may have gotten into the rails from the CP3 possibly pulling dirty fuel from the reversed plumbed filter. the particles would likely settle on the bottom of the rails and would most easily get flushed out from the rail plugs. if you could get enough flow to come out of one of the injector connections on the rails it should do the same thing.

be careful with the injector lines as they are very stiff and when moving them out of the way so you don't squirt dirty fuel into the line there is risk of twisting the injector which may stress the seals on the return lines under the valve covers and cause a leak if you dont take it off completely and even then it is still a risk.

you may be able to flush them out with compressed air pushing the diesel out quickly or back flushing them by reversing the flow of diesel. put diesel into one of the injector connections on the rail and flush it out the rail supply line or another injector port

if you feel lucky you can just hook it all back up and prime it and go but with expensive new injectors i would play it safe
 


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