hello , I have a 350 sdl.........nope still running........the injectors were "rebuilt" before I bought it......well first off , I just replaced the return hoses because i guess they felt pulling the injectors and not replaceing 10 dollars worth of hose was a good idea....My fire wall and undercarriage won't rust now due to the amount of fuel oil covering them...okay, the number six injector seems to have some blow by coming from around it. possible out of a little machined notch in the head. I pulled the injector and there appears to be a sealing ring/spacer/something under the nozel of the injector that was reused when they were rebuilt....Is this a crush washer of some sort. does this engine normaly sound and Kinda idle like my 5 cylinder 300d (84). It feels like it is missing but once reved up, smooth as silk. Ignorence is bliss untill my wife smells diesel.