How to Install Duramax LB7 Injectors 

Truck Master: I just finished an injector job on my 2001 LB7 yesterday, and I truly wouldn't/ couldn't have tackled it without your video. Many thanks, all your videos are very well done, and easy to comprehend! To give back a bit for other newbies: This is a big job, not super difficult but you must commit some time and a lot of patience. It took me about 24-man hours over 2-weekends to complete, as my first time. I performed the work in my driveway with outdoor temps in the 50's dropping to low 30's in the evenings. I surely could get this job done in a single weekend now, without having to refer back to videos and cross reference sub assembly steps -not covered in one place. My previous experiences include brake jobs, struts, shocks, exhaust upgrades, power window repairs, performance tuner, climate control and fluid changes. I will reply back later with more observations encountered for me.

one of the best videos technically speaking I have witnessed. Im a 32 year mechanic, and can tell you I would take my veichle to these guys. Real pros.

This is a great instruction video. I purchased a kit from injectors direct.The parts came in a few days. I watched this video carefully and it was the best instructioms. My install went pretty well and my lb7 runs great and is sealed up good. If you are replacing all the injectors buy a kit with new fuel lines the old one have rust and will contaminate your new injectors. With this video and torque specs from the Hayns manual the install took time but went smoothly. The install kit was invaluable as it had all the parts needed, from seals and lock tight for the injector cups new to new steal hi pressure lines and all the banjo bolt seals for return lines and ficm. The video is awsome and helps you get the extra tools for the install. Like you can you can use the end of an air hammer chisel (not the air hammer) in the injector bolt hole to help pop the injector out. To pull injector cups a 3/4 concrete anchor two nuts washer and 1 1/8 id pipe really works pulls the injector cups easily. HF crows foot line wrench set 19mm for torque and removal of hard lines. use Sil glide silicone on all rubber seals is a real pro tip. These tool tips from the video saves $100s in special tools and is apreciated. All tricks found while watching this video. I would recommend watching extra videos on injector cup install. Thank you Truck Master

Wow 24 minutes for lb7 Injectors! That has to be some kind of record! It took me and my mechanic 8 hours!

You guys do a real good job documenting the project. I do like it when mechanics use fender aprons when working on my vehicles, only because I wouldn’t want any inadvertent scratches on my truck. Plus it shows consideration for the owners property. Other than that, good job, keep up the good work.

I worked at a dealership and we had an LB7 come in and as the new guy they were so kind to give me the honor to swap the injectors..... it had over 400000 miles with the original injectors. So the valve covers was never removed which took a good while to pry loose. But it was my first LB7 job and I did enjoy the experience. Actually getting ready to do my injectors, cp3 pump and glow plugs once my parts come in.

Being a seasoned automotive technician mid level tech for 10 years prior to starting my business i know i can handle this job. You guys made it look so easy. Im sure it took a little while. I like how diligent he worked. Seams like a great tech. I am planning on buying my first diesel lb7 within a couple years and using it to plow and tow my lawn care trailer. Also ide like a dump bed insert for all the grass clippings, and yard cleanups plus junk removal jobs i do! This truck is legendary.

Thanks for this awesome video. I must have watched it 100 times while changing my LB7 injectors. This video is the best one I’ve found. Well done.

I did this years ago, and would have greatly benefited from your video. As I recall my effort, I'm sure that I spent 4x as much time and effort as I see here. Very well done video!

Hands down the best and most useful video I have seen on Lb7 injector swap. Can’t thank you guys enough now let me make it not look so easy like you guys did.

Wash engine off First put in shop and let it dry over night dont need any dirt grit and grime getting into the engine Zip lock bags and zip ties versus rags Working thru the wheel well will help saved a persons back Might as well/always replace both thermostats(why not) Silicon on top of the high pressure fuel lines to keep dirt out

This is by far the best step by step video on lb7 injector replacement that I have seen! I have a couple of questions. What did you do to prep the injection lines before reinstalling them? The dirt on the injectors came fron the lines rusting and collecting dirt, not the fuel. Installing used lines is a potential new injector killer. I also capped the fuel rails and the injectors for more dirt protection. I also pulled the cups and replaced them with new cups and o rings just because I was there to prevent a possible future leak. Lastly I also re lashed the rockers back to .012. Other than these couple of thoughts, great vid!

Terrible memories of when I did this work on my CA LB7 last summer. EGR on the passenger side added to the job. I kept reminding myself of the $3k I was saving, although toward the end, I wasn't so sure. All is well now. Pulling injectors can be easier by putting one of the old HP lines on and using it to twist and pull while prying under the hold down clamp. Toss those old HP lines unless your are sure you can't see any 5-10 micron particles 😀😀😀. As others said, get new ones! Regarding popping the upper valve covers, a short block of wood and a hammer, starting at each end, loosened mine easily. Finally, while you are in there, adjust the valves. All mine were way loose. Use a section of lumber to super tension and block the serpentine belt, then put a wrench on the alternator pulley to easily turn the engine. Don't prefill the fuel filter! Too risky and dirt can easily be introduced into the lines past the filter. Just use the primer button. A final thought. Following considerable research. Im convinced problems with LB7 injectors are fundamentally due to the VCO nozzles originally used. SAC's were used in all later models (LLY and on) and injector problems were much fewer. SAC's are available for LB7's, but only in higher flow designs, which may not be compatible with the original FICM and ECM and will require use of a tuner. All in all, you guys get a solid A on this video! 👍👍👍

Thanks for the video guys! I’ve watched it twice now. I’m sure it will take some time, but with your video I’m sure I can do it. Great tips too.

This is the best video for injector replacement for LB7. Definately gave me the confidence to tackle myself. Thanks for the videos and info.

This video made me comfortable to try it on my own and it’s done now, stripped 3 of the valve cover bolts though😂

Just did my injectors same truck I nicknamed mine the white smoke but now I have to change the name!! I couldn't of done it without this video!! Thank you truck masters!!!!!

This is by far the best step by step in how to replace lb7 injectors I’m going to be replacing my tomorrow wish me luck !!

Most guys go to school or some kind of voter classes to learn this but look here we are all learning it for free thanks guys

I was charged over 2k for replacing a bad injector. After watching this video, Whew! I'm glad someone else did it!

The only thing I would not do is wipe the tip of the injector with a rag. I've had a 475 cat engine give me problems because a tiny piece of rag lint got stuck in the tip and distorted the spray patter

Enjoyed watching what is involved in changing the injectors on my LB7. My mechanic said most of the cost was going to be in the 10-12 hours of shop time. I bit the bullet and paid him to replace them. It’s not my daily driver anymore so I’d be tempted to try it myself after watching your video. Thanks for sharing what’s involved.

Excellent work, and thank you for the content!!! I'm gearing up to do this job on my LB7 this spring 😀🤘

I hate when I get on forums or enthusiast facebook pages and hear everyone saying it's a nightmare. I need to do injectors and I've debated just running the truck into the ground....until seeing this. Looks pretty damn simple, just time consuming and annoying. Video is saved!

Videos like these are the reason I subscribed. Thank you very much.

A heel bar between the fuel rail and pry tab on the valve cover is another quick easy way to get the upper valve cover off. Also the debris in the top of the injector fitting is absolutely normal when you remove the injector lines as the nut is full of debris and it falls into the top of the injector as you are removing the line. That debris is in no way a sign of the condition of the injector itself. Also an air hammer bit fits into the injector hold down bracket perfectly and works better than the actual injector removal tool in my opinion.

Great video!!! This channel will grow big with videos like this. Huge thanks to both of you for making it happen!

of ALL the vidz on THAT style injector removal it is the absolute BEST on all of internet. good on u all !!!!!8)

This is exactly what I needed. Thanks guys. Now the task doesn't seem as daunting. Can't wait for it to cool off here in southern Louisiana so I can start this process!

Super easy way to get injectors out is use the high pressure fuel line you pulled off for leverage to wiggle it and pull right out, especially if using new high pressure lines. I prefer to use the number 1 cylinder line due to lack of bends.

This video just saved my bank account thank you guys so much

It seams as if y’all have had done this a time or two great job step by step

Another trick I use to pull the injector out of the cup is by putting the hardline back on and use that as leverage to pull it.

Perhaps a video on some injector nozzles on the LBZ next?? I’d love to see that and I’m confident you could make a quality video showing the process.

When I did mine, I changed all the fuel lines and return line. However, I had to reuse my #7 fuel line as the new one was not bent properly and couldn't find one that would work. I brake cleaned the hell out of the old one and visually inspected it for any rust. Finally got it cleaned up. Runs good but still have the drivers side to do. 😒😒

You should seal top of injector nut that connects to injector. It keeps dirt and corrosion out so next time you have to pull injectors all that crap doesn’t end up in injector inlet.

I use a 5.5mm on the covers. This cut down on them rounding out not the split hair. This is a great video. I attempted to video myself working it’s impossible. Ty

As I'm doing the injectors on my ol lb7 I think.. what has this truck been through since I've owed it ten years.? #1 favorite. My brother borrowed it without permission and got a speeding ticket. 113 mph. . Hilarious! Then I wonder how fast is the lb7. ?!

Now I see why this type of repair on the lb7 is so expensive. Pretty labor intensive. I'm looking at a 2004 duramax that MAY be an lb7 but idk for sure I have to check out the vin #. Hopefully it's actually an lly but I just wanted to stop by this video and see what I'd be getting myself into before I make a decision on it. Trying to be smart about this lol

Damn, that's hell of process doing this job.

I mean, you guys did a great job but I wish you would have still filmed the drivers side. That is much more difficult and I can’t seem to get any of the injectors out.

Great video, love how in depth you get in your videos.

thats honestly not as bas as i thought it would be basically just a bunch of stuff to get to the valve cover and thats it haha thanks man my injectors are good but if they ever go out now i know i can do this in my garage instead of paying a shop over 1k

Holy crap I'm glad I had a shop do my LB7.

Hey so put new injectors in and add the cat filter set-up, still smoking planning on the Airdog once I can get it. Not sure what I need to be checking out now, just not running as it should yet. I walked into this knowing I was going to need to put lots of work into it. I also know that I've got some major wiring issues could that be part of my problem hidden in the wiring. I will be going through it all once it warms up and I got time. Thanks for all your great videos enjoy following them.

You should make a list of all the tools you will need and list them in the comment section

My dudes…. I have to watch it twice because the talk thru is great but again because slowwwwww down. Get somebody to ask all the dumb questions ON video…. Cuz I have alllll the dumb questions! Cheers guys.. thanks for the video.. (at both speeds)

Great video. That job makes me not want to consider a LB7 Duramax. These videos are great. I like to do my research before buying a vehicle. Your content is really opening my eyes on what DURAMAX items to look for and consider when looking for a project DURAMAX. Given the price the LBZs are demanding, think an LLY is looking pretty good! I know you don't want to show how to tune a truck. I totally understand that. However, you say to take an Edge tuner to read injector balance. So, since no one selling a truck would tell a lie, how can you tell if a truck has been tuned and, if it has been tuned, how can you read the tune? The videos are popping up in different order but I think I'll keep watching.

First of all, Congratulations on your you tube channel. Now the real journey begins.... you've motivated me to tear down my truck lol. I have a 2004 Lb7 that needs a couple of injectors redon, because of your "in detailed video" by the way GREAT JOB!! to the both of you...I'm on a mission.... wish me luck guys... if I need any help, I will be contacting you!!!!! LOL Hope y'all have a Happy Holidays!!! HELPPPP

Dont forget too let them know that sometimes the return bolts will strip out and that the driver side rear valve cover bolts can be and absolute pain in the ass. Ive done lb7 injectors on 3 trucks and never is it a fun ordeal.

I really want to thank you by far you two have some of the best videos on this RU-vid most of the other channels are not even worth watching anyway that being said I a die hard power stroke guy my veins definitely are pumping blue all my buddies are dmax guys and after watching your channel I’m thinking about buying a blue biscuit type truck I know where there is a few in the 4 to 5000 range a little rusty and crusty but that’s life in the northeast on older trucks once again thank you and I would like to also thank you for your service to our great country being an E7 is no joke

SOB cummins guy here , thinking of getting a beater lbz as a work truck but not anymore after this nightmare

If you're watching this in 2020!!! I beg you DO NOT use the method of putting a air chisel or hammer bit into the injectors hold down bolt hole and hitting it with a hammer!!! This will potentially mess up the bolt threads and cause a huge issue for you going forward with reinstalling your new injectors, not a good idea and clearly not thought through however the rest of the video was great and personally the passenger side is a cake walk compared to the drivers side be ready to strip bolts and spend hours getting them out in various ways😁💪 good luck!

Thanks for the informative video Truck Master and Logan. I’ll be doing them soon to my 02 I just bought.

Pretty damn thorough video! I dont even have an lb7 but I own a 6.2 haha Looking to buy one eventually though! Hope i never have to refer back to this video but at lest i know its here now! Thanks guys!

i’ve got a question lol how would i single out one injector that’s stuck open i don’t have the money to put it in a shop or buy all injectors i just need to single out one for now to get it running i was told to disconnect a injector line and witch ever one stops the knocking is the one but when i disconnect it the fuel line it won’t crank i appreciate any advice!

I would suggest replacing the hardlines they rust on the inside that's where the majority of that crud came from. Cheap insurance to protect spendy injectors. I bought a kit from pensicola diesel that included brand new bosch injectors, new hardlines, new cups, new glow plugs plus all seals and return bolts for 2100 bucks cheaper than most places charge for just reman injectors. I also replaced the injector wire harnesses they go through so many heat cycles they get fragile and prone to failure.

nice video I kinda cringed on reusing the hard lines but ive seen them not have corrosion. that snap on crows foot looks like a must have. I have a leak on passenger side looks to be coming from under ficm hard line but looking more around engine valley I see moist rubber lines oh boy hopefully I can fix it this weekend

Honestly not to bad seems simple abd straught forward, you earned a sub here

Very well done video! Hope to see some LML stuff in the future.

Thank you guys , you are make my day God bless you

I’ve done two of these I get the air hammer chisel and give it a whirl tomorrow. If it doesn’t work I guess the slap hammer coming out lol 😂😂

You guys done a very good job at explain the whole process thank you very much appreciate it

I was told if you put in new injectors you will have to get your truck tuned is that only for bigger injectors or is that for stock injectors as well thank you for your time

Very informative and well explaining details and tip good 👍 job 🖖I learned new tricks if you have more video like this

I just did mine last week, I see why don't show much of the right side. Those upper and lower valve cover bolts next to the firewall are a bitch. Awesome video!

bought my injectors from LDS 2 years ago. installed outside in the snow. wouldnt of did this if it wasnt for this video.

Awesome video, can't wait for the next one.

I didn't have much smoking at my exhaust, but I did have fuel in my oil.it was full up with diesel. The only thing that alerted me to this was I got a low oil psi warning at idle. So can I assume I have one or more bad injector. It's an 04 gmc lb7 that has 140k I bought in 2006 2nd owner. As far as I know never had injectors done.

I need a couple good conservative Americans like you guys to hang out with and do this to my 2003 ZF6 LB7

Great information! Much more detailed and easier to follow than the other how-to vids on the subject. As a side note, there are 12 bolts on the lower valve covers.

I think you forgot the step where you question why you spent so much money on injectors.

Great video guys! I'm looking forward to any and all upgrades you do to the blue biscuit/lb7.

Great video!! Quick question. Does it matter how you rewire the injectors? Asking for a friend that's working on an LB7 on his on watching this exact video. Thanks guys!!

All be it this vid is pretty old I will post this to help the guys with a CA lb7 you will face a few issues when following this guid because a few things will be different. For starts the passenger side the pcv lines and vacuum lines are on top of the motor causing a problem when you try to disconnect the fuel lines coming off the fuel rail. It really only a problem on cylinders 1&2. The nut on the injector is standard the issue comes with the nut on the fuel rail. I recommend a non flank drive 17mm box wrench for the fuel rail. Torquing it down to the 30 lbs will have to be by feel as it’s pretty hard to get a torque wrench back there. I recommend ordering all new pcv lines before you start this project as well as making sure you have new banjo seals for the fuel lines coming off the FICM. They are not included in most Injectors seal kits for the job. The passenger side will be the harder side between the pcv lines being on top and the EGR sits higher due to a different bolt pattern so it’s just a pain in the ass to get the Injectors out on this side! Thanks for the big guys you saved me a lot of money

Best LB7 injector video. Thanks

Extremely helpful video thank you!

Great video thanks for the pointers this is going to help me so much

Saved me $2000 doing it my self

So a genuine question here. Why don't mechanics spray down a motor prior to tearing it down? Is it more of a concern of causing more issues than what's currently going on? Before I work on my vehicles I will usually wash them off after soaking them with engine degreaser & then warming the engine up to dry all the excess water from the engine. Seems to me that things would go better if everything is clean??? Just curious...

That’s a lot of damn work

Awesome video men, my lb7 is the same color but mines s dually.. 0.0 -0.7 balance rates 💪🏼

Hey how long will lb7 injectors last for setting for a long time like as in 4 years please get back with me

Did you not hve to bleed off the pressure of the high pressure side of the fuel system?

I’m getting a lot of fuel mixed with oil and it’s poring out in the front of the block and in In between the transmission and the motor on the bottom!!! Please help me!!! I have broke it down three times now and I’m just wanting to give up!

Great video I used it to do my injectors because I didn't want to pay an enormous amount to my dealer for the work. I was able to get it done and I crossed my fingers when it was time to try and start it. It only took two sessions of pumping the fuel pump for it to crank and man it sounded sweet compared to the way it sounded before I changed the injectors. But unfortunately I ran into another problem and that is the RPM's will not go over 2000. I couldn't believe my luck as it seems it is in "limp mode" and there seems to be several different ways to try and clear it up but right now I am going to buy a code reader so I can clear the codes to see if it will run correctly afterward. Any help with this issue would be appreciated.

Gotta love that cringeworthy prying on the aluminum mating surface of the head

why not do lift pump first then it would help protect injector job great video thanks

Awesome video guys I don't know the Duramax yet I've always wanted one and these videos and this channel has really quite honestly helps me decide what kind of truck I want and I think I do want to buy an l B7 is what I think I'm wanting a lot of mods you can do it and seems like it's less b******* on the motor then anything else

Great video guys, i just replace my injectors on my lb7 i went with sac style 45%overs and got efi live with dsp5 tune for the injectors, now my truck smokes white all the time and still loosing coolant, smoke smells like fuel and not coolant

Thank YOU SO MUCH FOR THIS VIDEO!!! Helped alot

thank you for putting this video up. it helped me

Do you have a list of parts used for this injection change ?

Should have hot washed the fuel lines to the injectors. If you don't your going to have problems.

Not sure if your air nozzle is long enough 😂

If you fast forward the video to 21:28. The wire you are holding what is that for? I went to find the end of it to find it not attached. My trucks been running pretty rough. Could that wire be the reason?

I'm in about getting my first Duramax. What you guys recommend ? If this is the main & most expensive problem in LB7 Then if I learn how to fix them it's become a good idea buying the LB7 better than other Duramax?

The video around 21:25 minute mark. You talk about the 8mm black wire. Is that off the intake heater relay? Where is it mounted to?

I sure miss my lb7

What kind of work light is that? Really like it & thanks for the video, lots of good info.