Starting in 2006 Bosch began using the hard chrome seat, but still used the old body material. The hard chrome seat is resistant to wear caused from our crappy fuel quality in the USA compared to the good stuff in the EU. One of the problems I see constantly with the hard chrome seat is higher leakage rates, even with low miles. They tend to leak about 50% more fuel than a standard tool steel part. The good news is, they stop at that point and dont continue leaking past that in most cases.
The newer material injector bodies did not start production until about March 2008. These still used the old style nozzle and pintle guide system. No factory Dodge truck will have these. Only trucks with replacements parts. Dodge dealers no longer purchase new Bosch injectors, but rather a Cummins reman from Cummins. Cummins remans their injectors in Mexico....as an FYI.
The newest of the injectors use a rear pintle guide system. These began showing up in the first months of 2010 and the older style is no longer produced.
No changes have been made to solenoids for any year in the 5.9. They are still a .4-.5 ohm bobbin. Most have about 59-61 microfarad inductance that usually pull between 17 and 18.5 amps of pickup current from the ECM/power supply.
It is impossible for a 6.7 injector to be used with the 5.9 factory ECM. It is a totally different bobbin design in the 6.7 with lower resistance and inductance. The voltage and current used are not anywhere close to one another.
A few quick notes on seats/valves:
Fuel quality and pressure are the top two reasons for failure. Dirt and water either erode the material away through abrasive action or oxidation/rust.
Higher pressure increases the abrasive action. Rust that has formed on the metal parts will erode away even faster with higher pressure.
The lower pressure 03-04 engine injectors wear seats/valves at a rate that is multiples less. I dont see many that are worn compared to nearly all the 04.5 and up engines. The longest lasting injectors by large margins are the 03-04 with stock filtration systems and fuel pumps.
Fuel quality and filtration is paramount for long life. Do not use fuel from a small farm or construction site tank. Always change filters. Never fill up at a station that has a fuel delivery truck present. Find out the delivery dates for your station and schedule fill ups at different times.
