Good diagnostic in the beginning of why the diagnostic tool couldn't communicate with the computer. I think adding detail like this to your repair videos shows a whole lot more about what it's really like to be a mechanic.

You have taught me so much about the operation of Diesel engines and have really pushed me towards a future career in the diesel industry, light or medium-heavy duty. Thank you.

Weird, just changed 6 injectors in a 6NZ today, what I do to remove the fuel is take the return fuel line off at the filter housing and run it into a container then remove the other fuel line to the front of the head and blow air into it till all the fuel is out of the head.

I was about to buy a lake boat for $7k when I got a nicer boat free because the crankcase filled with water very fast. I used the compressed air trick to find the problem which cost a whopping whatever JB Weld cost and three gallons of cheap oil. Four years and going strong.

I've been doing this for years, this young man is good at his trade! Great job with diagnosis.

I come from the generator world of diesels, it’s always fun to watch other techs diagnose issues in their field. You follow the same logical diagnosis path as I do, start with the simple things, use all your senses, and use the proper tools. Great work you do man!

When I was having all the trouble with my engine earlier this year, I finally bit the bullet and got a new cylinder head which had to be made for my engine, and six new injectors, and new jakes due to sticking plungers and all my problems went away. Truck was down for 6-weeks so I had to rent another one. While my engine block and components were the same as all previous iterations of my engine design, the cylinder head was of a newer design using chrome parts and none existed anywhere. So a new head was cast and all new parts installed. Cost me a small fortune however the shop had to eat some of the cost as it was their tech who caused the damage of the old head when he installed the head gasket upside down during engine rebuild. The entire firing deck was pitted bad. Truck runs like a champ now.

Always a pleasure watching a professional do his job!

I watched this video a couple months ago. I bought some indexing pry bars like you suggested. Those things made a couple tasks way less frustrating for me. Sure glad I bought them. Thanks for the tip.

Wonderful video...even an old electrical/mechanical engineer like me can follow along. Always concise, well edited and to the point. Merry Christmas Josh.

ive watched your videos for years now and have learned a lot from you. i have to say youre a rare mechanic. before i knew much about engines i remember the hassle of going to multiple shops and getting charged for not finding an issue only for it to be something small and stupid. like this one time where i use to work we had a dump truck with a 3406E that had a major power issue. boss took it to many shops with no resolve and got charged thousands for many ATA pressure checks only for me to find out it was a cracked turbo band clamp on the compressor housing. i wasn't really allowed to work on the trucks outside of greasing them and changing lights but i felt this was an easy fix that he was spending way too much money on finding and one day while greasing it i took a real close look at the turbo and with the truck running could hear a slight boost leak with my ear up close and felt a little air escaping the band clamp. fixed it and the truck ran awesome after words

Watching young guys work is nothing short of amazing, whether it's the guy who built my exhaust system or one of the online guys like South Main or Pine Hollow. Their trouble shooting techniques are a thing of beauty.

Yeah my dad was an old school mechanic and he had that same opinion about people using computers weren't real mechanics. Unfortunately this led him to not really being able to fix modern cars. You're absolutely right that you can't really touch a vehicle these days without knowing how to deal with its electronics. Everything is controlled by the computers and if you aren't talking to them you're not listening to the vehicle.

Good info, just bought a FL70 with a 3126 (190hp 295k miles) that smokes white smoke. Guy who sold it said it needs a motor, but it just had huei and injectors about two weeks before he put it up for sale. I'm wondering if they got a bad reman injector. I'll ask the shop to do a cylinder cut out test to see if it's one cylinder causing the smoke. As always, appreciate your videos

I'm 69 years old.There's not a day that goes by that I don't use the

i love the 3/8 stubby. I'm a diesel tech at a Peterbilt dealership in California and I'm primarily a transmission guy and that 3/8 is great for removing and installing transmissions. its small but has a hit!! defiantly worth the money.

i find it fascinating that you do the stuff with the computer. im used to mechanical and watching you deactivate that cylinder like that was pretty cool. cant see how anybody can hate something like that

Thanks for sharing. I have a Detroit but am trying to get a cat soon. One of your videos previously stated that while different diesel brands are very different the basic principles are the same. I used the tool that you are using here the brake bleeder as you recommended on a previous video to purge/ prime the fuel rail and vacuum cylinder on my first injector swap on a Detroit 12.7 and just like you said it would work on any diesel. I also used the same pry bar you used here or same type to pull the injector. Thanks for all of your wisdom. I am an owner operator and when I can instead of listening to the radio in my truck I listen to your videos and when I can sit still watch them as well. and they have taught me a lot!!

I have a Diesel engine that is running just fine, but after watching your videos I always end up with a feeling like I need to go work on my truck ;). I love your content, keep up the good work!

After 3 skillsets in 30 yrs, I still am entriqued by diesel engine repair.