Duramax Diesels Forum Truck of the Week
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Old 04-08-2019, 10:38 AM
Oaxaca Oaxaca is offline
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Default Injector bolts disaster

I tried to removed the injector bolts and 4 out 0f 5 have broken no matter if a rock or left them 3 days soaking with PB they are breaking very easy. The passenger side lower valve cover also stuck where the bolts broke. I live in the rust belt and these bolts are very rusted the driver side injector lines had to be cut to remove otherwise not budging, so frustrating.



Any advice on removing the studs and the lower valve cover would be appreciated. At this point I'm looking at removing the motor to get better access.


Doing a HG job on the motor due to failure.



Truck has 260k any advice on replacing any other components while the engine is out?



Thank you
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Old 04-08-2019, 12:55 PM
Ron Nielson Ron Nielson is offline
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Water pump and thermostats, serpentine belt, idlers, tensioner, flush the heater core, clean cooling stack, clean residual oil from inside of intercooler
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Old 04-08-2019, 01:13 PM
hhh217 hhh217 is online now
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I had the same issue on a junk engine I was tearing down. I ended up taking a cutting wheel on my grinder and slicing the lower valve cover in front of each injector bolt. I then split the valve cover by hammering a chisel in the cuts I just made. The valve cover then slid up over the broken injector bolts. Once the cover was removed all bolts screwed out of the head with vice grips.
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Old 04-08-2019, 06:27 PM
Oaxaca Oaxaca is offline
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Quote:
Originally Posted by Ron Nielson View Post
Water pump and thermostats, serpentine belt, idlers, tensioner, flush the heater core, clean cooling stack, clean residual oil from inside of intercooler



Thank you Ron!
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Old 04-08-2019, 06:33 PM
Oaxaca Oaxaca is offline
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Quote:
Originally Posted by hhh217 View Post
I had the same issue on a junk engine I was tearing down. I ended up taking a cutting wheel on my grinder and slicing the lower valve cover in front of each injector bolt. I then split the valve cover by hammering a chisel in the cuts I just made. The valve cover then slid up over the broken injector bolts. Once the cover was removed all bolts screwed out of the head with vice grips.



Damn! that's harsh, I hope to save the valve cover once the engine is out will see, cross my fingers for now.


Thanks for the tip anyways
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Old 04-09-2019, 09:09 AM
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ikeG ikeG is online now
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Did the injectors come out?

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Old 04-09-2019, 10:00 AM
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This is one benefit the LB7's have, there injector hold down bolt is under the valve cover soaked in oil.

I've had good luck with smacking the head of the hold down bolt with a hammer and punch a few times before trying to loosen bolt.
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Old 04-09-2019, 11:16 AM
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Instead of pulling the motor, I would remove the hood, fenders, and front tires. You get a lot of access, and in my opinion would be less work.


Good luck on the bolts.
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Old 04-09-2019, 02:48 PM
Oaxaca Oaxaca is offline
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Quote:
Originally Posted by ikeG View Post
Did the injectors come out?

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Yes they did
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Old 04-09-2019, 02:50 PM
Oaxaca Oaxaca is offline
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Quote:
Originally Posted by duramaxzak View Post
This is one benefit the LB7's have, there injector hold down bolt is under the valve cover soaked in oil.

I've had good luck with smacking the head of the hold down bolt with a hammer and punch a few times before trying to loosen bolt.



Ill try that, looking also to heat the cover.


Thnx
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Old 04-09-2019, 02:57 PM
Oaxaca Oaxaca is offline
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Quote:
Originally Posted by BlkMax View Post
Instead of pulling the motor, I would remove the hood, fenders, and front tires. You get a lot of access, and in my opinion would be less work.


Good luck on the bolts.

You might be right there, still battling the last two passenger side tranny bolts that are behind the tranny dipstick. PITA job, there should be a bulletin re HG's
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Old 04-15-2019, 10:44 AM
Oaxaca Oaxaca is offline
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After removing the engine and removing the heads everything looks good except for the failed gasket on the passenger side. these are pistons 1-3-5-7, 1-3-5 look wet 7 and driver side look dry. https://photos.app.goo.gl/ZmZPc4PihnMCMH4f7


Cylinders look clean.


What do you guys think?
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Old 04-15-2019, 11:35 AM
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Looks fine to me. How do the cylinder walls look?
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Old 04-15-2019, 01:01 PM
Oaxaca Oaxaca is offline
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Quote:
Originally Posted by 2004LB7 View Post
Looks fine to me. How do the cylinder walls look?

I added the walls



https://photos.app.goo.gl/ZmZPc4PihnMCMH4f7


There was a little coolant on Cyl 1 maybe 5 mml
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