Other than the "1/8-1/4 turn" of the rotors the visual condition of your blower sounds normal. Blower lobes do not stay clean and collect oil fumes. Firstly....I am not agrueing with anything you have said....just in case it might sound so. I have been told that the blower seals are a weak link and that triggering the emergency shut down will suck the seals in and ruin them, Regardless if all that is true....how can I tell if the seal is bad and howw much oil is too much and where is the eposit normal? They also get scratches. I have looked at a half dozen of these blowers and ALL had scratches ad gouges so dep that I thought the engine must have injested gravel. I was told, as you have said, thsat that is "normal". What is it that scratches the rotors?If you really have that much play in the lobes it is probably the blower drive and/or shaft. Also, if you take the blower off you should rebuild the governor, and you will have to "run the rack" on the injectors. All of this is not for a beginner.There are beginners and then there are beginners. I am a beginner and I say that without reservation. I also blueprint my engines and rebuild my own trans and hydraulics. Is it that you need information that is not in the book? Do you need the support of a Master Mechanic? Are their tools and equip that are rare or out of the reach of the amateur mechanic? I was once told that to run the rack that you need more than two thousand dollars worth of "gauges". I asked my DD dealer and, baring his not understanding my question, he said "you only need the gauge associated with the injector your engine is equipped with." He mentioned that you need long feelers gauges but you can make those or buy the DD items for modest money. Was the DD rep/mech correct? What do you think a learning mech might have to invest to run the rack on a specific engine with a certain size injector? I am asking you because you are expert in these matters and you opinion matters.--GeoffGeneral Diesel SerrvicePrescott, AZ
On a MUI engine there is a lot of mechanical magic going on in there, and you really do need to understand it before you mess with it.Now, hopefully in the next month or two I will get a nice little 6V-71 that I can take a look at and mess with, and maybe I will be able to figure out what makes them tick. My motto is someone figured it out once, I can do it twice! But I will think long and hard before I take my running engine apart and see what makes IT tick!Brian
"The thing about 2-stroke Detroits is that it DOES take a few times to get the feel for what you are doing."