LB7 Injectors...

[More Power]

Was listening to local radio the other day when I heard an ad form a diesel shop offering to replace the injectors in an LB7 truck for $2900... This is a shop I hadn't heard of before.

Got me to thinking about injector service in general. What are people paying for a Duramax injector replacement using good parts, and by a shop that does it right the first time?

[Kennedy]

I'll throw in my $.02

The price of the proper Bosch remans alone pushes pretty close to that price so the injectors used would undoubtedly have to be 3rd party remans. That price certainly could not include new supply lines, and I would be suspicious about coolant replacement. We also as a matter of practice do thermostats because we are there and have the cover off and system drained. Realistically it takes 12hrs to do the job provided no major speed bumps along the way. Some can and may do it in less, but haste makes waste with these type of projects.


Add to that we've seen SO many LB7 injectors fall to the blue smoke issues after a mere 40k and sometimes less. For this reason we are favoring the SAC type nozzles.

[More Power]

Tell us about SAC type nozzles and how they are better choice. I did a little reading online, but it wasn't completely clear. I plan on replacing the injectors in my truck this spring. More info is always better... Thx

[Kennedy]

The LB7 is unique in the Dmax lineup as it is the only model that uses the VCO style nozzle. The SAC nozzle is the mainstream nozzle used by Bosch on all other Dmax. It is my understanding that the SAC contributes a small amount of additional hydrocarbon emissions due to fuel lingering in the SAC. The VCO nozzle was designed to eliminate this. The catch is that with the VCO is that not only does it have to close off all 7 spray holes simultaneously, it also needs to deliver/distribute the fuel evenly. The SAC type just turns the fuel off and on.