Attention: TDR Forum Junkies 
I don't own a 6. 7, but I have them on my job in Johnston sweepers. One of them hasn't been running well lately and felt like it had a miss. Sure enough, it lit the check engine, and since it only has a couple hundred hours on it, it was covered by Cummins.
I hung with the Cummins tech for a while to see what he was doing- and he was going right for an injector. As he was removing the vlave cover, he found corrosion in a connector at the valve cover. It seems that this 6. 7 (I think it's a QSB- has accessory drive in back) has a flat connector upright and parrallel to the valve cover and the wires are molded in the gasket/ spacer. This looks different than the 5. 9 and the square connectors in the side of the rocker box.
On a seperate note, these 6. 7's have Cummins DPF's and run and regen flawlessly. Before this series, we has the same machine with Mercedes engines, and they failed miseribly. Before those, we had 5. 9 24V power.
I hung with the Cummins tech for a while to see what he was doing- and he was going right for an injector. As he was removing the vlave cover, he found corrosion in a connector at the valve cover. It seems that this 6. 7 (I think it's a QSB- has accessory drive in back) has a flat connector upright and parrallel to the valve cover and the wires are molded in the gasket/ spacer. This looks different than the 5. 9 and the square connectors in the side of the rocker box.
On a seperate note, these 6. 7's have Cummins DPF's and run and regen flawlessly. Before this series, we has the same machine with Mercedes engines, and they failed miseribly. Before those, we had 5. 9 24V power.
