12.7 detroit series 60----looks like i have fuel in my engine oil

Better stick with reman Detroit. That’s a great price for all six. Nows the time. They’ll probably last 1 mil miles. Well worth it. Fuel mileage increase will probably pay for itself in no time. Make a note of the calibration # on each injector for future reference. Some techs will increase settings of these across the set for better performance. Some set all at highest # of the set across all six. Doing that will help power but causes a rough idle. I think the way to do it is take the difference between the highest # and lowest # and increase all settings by that amount. Details are over my level of understanding. Something to ask about though. Regardless keep a record for yourself of the #s on injectors. It’s something done which ecm while plugged in. Go through settings with mechanic and set all cruise/ top spd / etc parameters to your liking

 

Totally unrelated. But make sure your antifreeze dca/ nitrate level s are good. Bad A/F can cause a pinhole in liner and other problems. Don’t need any surprises. Very cheap PM. That Engine should serve you well now for a long time

 

Need help on this topic. I had an inframe with genuine parts on my 12.7 ddec 4. About 100000km on engine and oil sample positive for fuel dilution. Cannot notice on dipstick but lab results prove presence of diesel in oil. Opened injectors again and got them tested for leak( no leak at testing with fuel pressure test while out). Changed all o rings on injectors and of course changed engine oil. After 2 weeks ran another lab test which came positive again for diesel dilution. Tried a different lab same issue.
Now the problem is that cannot notice any difference on dipstick. It's all black. I could tell oil is bit thinner but not increasing dipstick level. There surely is a very small leak some where. Cylinder head was also remanded from Detroit. Recently I also changed fuel pump but since it's mounted on air compressor and has no oil supply so i don't suspect it. So any help with this small dilution and where to look is greatly appreciated.

 

What's the percentage of fuel in the oil? If you idle a lot your likely to see fuel in the oil, it's inevitable. And if the oil level isn't raising and it's maintaining or using the same amounts I think your making a mountain out of a mole hill. If you've had the injectors out and tested and new o-rings installed I'd say the only other thing is a cracked injector cup. You can pressurize the fuel system of the head and see what happens. Disconnect the inlet and outlet, install a plug to the outlet and a pump to the inlet and pressurize with air from a hand pump. If it holds your wasting your time and looking for a problem. If it falls you have an internal leak. But so far without know the percentage it's hard to judge. As per any engine, Excessive idle time is never good. Eliminate your idle time for an oil change interval and see what that does.

 

Also what oil are you running? Is it a multi grade? 15w-40 or something else. When is the oil thinner? When it's hot? That's normal. What are you doing to justify the statement that it's thinner? Pulling the stick and watching it run off? The oils black which is normal. Anyone that says it's the same color going in and coming out is yanking your crank. Engines wear and contaminates the oil, plus fuel, hot and cold oil temps, changes the tint. What was the viscosity levels of the oil samples? How frequently are you changing? There are so many unanswered questions to your questions it's crazy.

 

Just did a oil analysis on a 98 12.7. just because I noticed poorer fuel economy. 6.3% fuel in oil supposedly. This is the first report of fuel in oil. Do I need to panic? Oil color looks good,no smell,no loss in power. Just poorer mpg,s. I will also add poorer fuel economy happened the same time b14 become standard in Illinois. B11 was good to ok. B14 everything changed (Maybe just a coincidence I don't know). Fuel source never changed as I have my own bulk fuel tanks not buying it on the road. Your thoughts injectors,injector cups,head? Thanks

 

Are you having any starting issues, or smoke on startup, rough idle?

Fuel is either coming from a leaking injector solenoid seal, or it's leaking past the rings whike shut off.

It is definitely a concern. Fuel dilluted oil does not lubricate well.

 

No starting issues,nor smoke on startup or rough idle. Gonna take another oil sample and send off to different lab. If it tests positive will take immediate action. Would I notice leaking injector solenoid seal when I remove valve cover,Jake's,etc,etc. Or would that be an internal leak on solenoid? I have done my own overhead(adjustment) and injector replacement.

 

You would use fuel dye and a black light, or air pressure. You can see it with the valve cover off with either of those. Usually they leak where the solenoid bolts to the injector body, or at the three screws/round plate below the solenoid.

Definitely do another sample first.