Actual reason for lb7 injector failure

[S Phinney]

No. They are a aftermarket Bosch Motorsports Nozzle. They are SAC design. Stock ones are VOC design. The difference in the sealing surfaces is the contributing factor for them lasting longing. All injectors post lb7 are SAC design. What the design means is that the needle seals above the orifices and not over them. What's important about that is erosion at the orifices creates a leak where the injector white smokes because it can't seal itself and stop fuel from entering the cylinder when it's not suppose to. They have been available for years but haven't been used by a lot of people for those benefits. I have several sets out there and am having very good results. Well enough that I will only use those on my personal trucks. I let the customer make the decision about how they want to spend their money and some listen and some don't. There is a added cost to use them.


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[036.6turbo]

Where did you source the donor?

Craigslist.

It was in a bone yard, 2.5 hours from my house.


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[bigmackmiller]

Craigslist.

It was in a bone yard, 2.5 hours from my house.


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I see, and it was a 2wd cab chassis, they happen to have anymore? If I can convert for that kinda $ I'd rather go that route than the inj. Replacing route

 

[036.6turbo]

I see, and it was a 2wd cab chassis, they happen to have anymore? If I can convert for that kinda $ I'd rather go that route than the inj. Replacing route

No they did not. Here is the link to them, you can contact them;
http://fodrocyautoparts.com/repairable-cars/2191796

If you look at my thread you'll see I looked at two trucks, before buying this one. They are out there. You just have to be a little patient.


I've been debating on this one. He says the motor is locked up. Could be something simple. Either way, there is a lot of salable parts there.
https://detroit.craigslist.org/wyn/cto/5849556611.html
All else fails call Hickville. They get pretty strong money, but they have a lot of duramax wrecks.
https://www.facebook.com/HicksvilleAutoRecyclers/

 

[bigmackmiller]

Yeah considered Hicksville, been up to their facility, but definitely want some big bucks

 

[TheBac]

Hicksville thinks all their parts are made of gold, and priced accordingly. No thank you.

That LBZ would be worth repairing, even if you had to put another engine in it. I wonder where the front bumper went? Probably had one of those god-awful gigantic ranchhand battering rams on it.

 

[Ne-max]

LLY has a pretty decent failure rate too. As said earlier, injectors are a wear item. But they are much easier to swap on an LLY.

X2. I see many lly injectors with high return rates. Balance rates dont tell whole story

 

[Summitsmoke403]

No. They are a aftermarket Bosch Motorsports Nozzle. They are SAC design. Stock ones are VOC design. The difference in the sealing surfaces is the contributing factor for them lasting longing. All injectors post lb7 are SAC design. What the design means is that the needle seals above the orifices and not over them. What's important about that is erosion at the orifices creates a leak where the injector white smokes because it can't seal itself and stop fuel from entering the cylinder when it's not suppose to. They have been available for years but haven't been used by a lot of people for those benefits. I have several sets out there and am having very good results. Well enough that I will only use those on my personal trucks. I let the customer make the decision about how they want to spend their money and some listen and some don't. There is a added cost to use them.


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This is the most useful information I have ever gotten on the reason as to why they suck. How long have you been doing this and how many miles are on your oldest set without failure?

Can you give me a link to a website to buy these? I think I'll bump up to 20% overs when they get changed again.



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[TheBac]

http://www.duramaxdiesels.com/forum/showthread.php?t=70952&highlight=SAC+nozzles

Lincoln Diesel sells SAC injectors. Probably the way I will go when this set finally dies.

 

[S Phinney]

Oldest set is just above 100 k miles. I've been doing this for probably three years like this.


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[Summitsmoke403]

Any added benefits to the sac design? Like fuel mileage, power, atomization? Obviously longevity which is the real selling point.

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[TheBac]

Read the link I posted. I think Shane explained it in that thread, too.

 

[Summitsmoke403]

Oldest set is just above 100 k miles. I've been doing this for probably three years like this.


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Wow that's amazing I'm reading the thread on them now. I'm sold

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[Summitsmoke403]

Read the link I posted. I think Shane explained it in that thread, too.

I am reading it right now and I'm totally sold on them

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[036.6turbo]

Hicksville thinks all their parts are made of gold, and priced accordingly. No thank you.

That LBZ would be worth repairing, even if you had to put another engine in it. I wonder where the front bumper went? Probably had one of those god-awful gigantic ranchhand battering rams on it.

I have spent zero dollars with Hicksville, if I were to buy the 2015 (salvage) I was looking at, I would be stuck with them.

I thought the same thing about the red one in Detroit, I did call the guy. I don't need another truck, but that's a lot of truck, for that price.

 

[InjectorsDirect.com]

I know it's been asked before but does anyone have any actual hard evidence as to why the injectors fail so frequently?


Has anyone ever tried sending the internals to an injector off to be coated with some sort of hard coating like tin coating, diamond coating to try and prolong the life of these things?

I got brand new updated Bosch injectors, hp lines and put a lbz cp3 in it all at the same time, all parts except cp3 were from injectors direct 30k miles ago and I have 3 that are crapping out.

I have a air dog 100 with new filters every 6 months, and a cat filter adapter on the engine itself. I RELIGIOUSLY run diesel kleen with 2 stroke oil mixed and try to run 50 cetane diesel from Southern states as much as possible. Now in my mind I should not have to worry about these things crapping out already but they are.


Any hard evidence or reason why this happens?

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Hi- My name is Andrew, I am the owner of InjectorsDirect.com. I'm sorry to hear you're having issues with the injectors you purchased from us. We sell LOTS of these injectors and normally have great feedback from our customers on them. There are many variables that can cause premature injector failure, but considering the fact that you are paying such close attention to fuel quality & filtration you definitely shouldn't be having injector issues after only 30k miles. Although it sounds like you're a ways outside of our standard 2-year warranty, I would appreciate the opportunity to help you get this issue diagnosed & resolved. Please give me a call directly at 1-800-500-0880 x101 at your convenience so I can get this taken care of for you & get your truck back on the road ASAP! I look forward to hearing from you.

 

[c20elephant]

I know it's been asked before but does anyone have any actual hard evidence as to why the injectors fail so frequently?


Has anyone ever tried sending the internals to an injector off to be coated with some sort of hard coating like tin coating, diamond coating to try and prolong the life of these things?

I got brand new updated Bosch injectors, hp lines and put a lbz cp3 in it all at the same time, all parts except cp3 were from injectors direct 30k miles ago and I have 3 that are crapping out.

I have a air dog 100 with new filters every 6 months, and a cat filter adapter on the engine itself. I RELIGIOUSLY run diesel kleen with 2 stroke oil mixed and try to run 50 cetane diesel from Southern states as much as possible. Now in my mind I should not have to worry about these things crapping out already but they are.


Any hard evidence or reason why this happens?

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Yes, 37 months in original development of a brand new engine and introduction to the US market, anything new is going have problems and the LB7 injectors being one of them or a design flaw that could not be anticipated until put into long term use by the consumer......

https://history.gmheritagecenter.com/wiki/index.php/The_Duramax_Diesel_6600_Story

In late 2000 the Duramax Diesel 6600 debuted for the new 2001HD pick-up trucks in only 37 months as the fastest new engine developed by GM Powertrain -at that time. The engine was an immediate success bringing up GM’s market share from 3 percent to 30 percent in the HD Diesel pick-up truck market.