Duramax LB7 injector disassembly
 

Since i had a spare LB7 injector laying around, and i consider myself adventurous, i decided to dismantle the injector down as far as possible

Because I haven't posted anything to meaningful in a while, I thought some of you might like to see the photos of this

Stock LB7 injector with an unknown number of miles on it.
https://lh5.googleusercontent.com/-_....NEF.jpg?gl=US

the nozzle comes off quite easily
https://lh3.googleusercontent.com/-L....NEF.jpg?gl=US

the needle valve comes out of the back of the nozzle with a gentle tap
https://lh3.googleusercontent.com/-W....NEF.jpg?gl=US

here is a close up of the pintle
https://lh5.googleusercontent.com/-E....NEF.jpg?gl=US

and the back of the nozzle
https://lh4.googleusercontent.com/-V....NEF.jpg?gl=US

in this photo you can see some of the spray holes
https://lh5.googleusercontent.com/-v....NEF.jpg?gl=US

to get an idea on how small the jets are, here is a measurement of the outside diameter of the nozzle
https://lh4.googleusercontent.com/-E....NEF.jpg?gl=US

this is where the nozzle mates up to. the two prongs keep it centered and aligned.
https://lh6.googleusercontent.com/-X....NEF.jpg?gl=US

and of course the parts that are in it
https://lh5.googleusercontent.com/-1....NEF.jpg?gl=US

there is still more inside it but they come out from the other side
https://lh5.googleusercontent.com/-J....NEF.jpg?gl=US

this is the other side. the solenoid removed
https://lh4.googleusercontent.com/-8....NEF.jpg?gl=US

this spring sits inside the hole in the center of the solenoid
https://lh3.googleusercontent.com/-1....NEF.jpg?gl=US

the top of the solenoid where the wires connect. i have know idea what the numbers mean
https://lh3.googleusercontent.com/-b....NEF.jpg?gl=US

some sort of contraption sits under the solenoid. i believe that this is the part that the solenoid pulls up on to allow the fuel to flow
https://lh4.googleusercontent.com/-H....NEF.jpg?gl=US

this part lifts out easy. the right side of the photo shows a small "cup" and bearing (ball) that sits under this contraption
https://lh6.googleusercontent.com/-b....NEF.jpg?gl=US

this one is tricky to take apart. you have to lift the spring and slide the retainer out from under it. here i have it pulled out half way
https://lh4.googleusercontent.com/-V....NEF.jpg?gl=US

once that is out, push down on A and slide retainer B out
https://lh3.googleusercontent.com/-v....NEF.jpg?gl=US

then it all comes apart
https://lh4.googleusercontent.com/-5....NEF.jpg?gl=US

back to the injector body, now a 10mm hex wrench is used
https://lh5.googleusercontent.com/-_....NEF.jpg?gl=US

this is where the ball seat resides
https://lh3.googleusercontent.com/-G....NEF.jpg?gl=US

close up of ball seat
https://lh3.googleusercontent.com/-G....NEF.jpg?gl=US

without the ball
https://lh3.googleusercontent.com/-J....NEF.jpg?gl=US

with the ball. on the revised design from bosch this seat and ball are supposed to be chrome plated.
https://lh3.googleusercontent.com/-D....NEF.jpg?gl=US

this is how small the check ball is
https://lh4.googleusercontent.com/-r....NEF.jpg?gl=US

to remove the fuel fitting, remove the pin and unscrew
https://lh5.googleusercontent.com/-G....NEF.jpg?gl=US

with everything removed you can now see into the body of the injector
https://lh4.googleusercontent.com/-Q....NEF.jpg?gl=US

all of the parts
https://lh3.googleusercontent.com/-W....NEF.jpg?gl=US

now this wouldn't be complete without a cutaway
http://www.thedieselpage.com/duramax/lb7injectors02.jpg

i hoped you enjoyed this

Jason