isaakfarms

I have a 92 CH613 with a 400 E-7 that we use as a farm truck. The truck had been trouble free for many years, then two years ago we had to have the head gaskets changed. The head gasket blew out between the heads and hot exhaust was coming out between the heads. After the head gaskets were changed the truck was great for the last two years, then a few weeks ago I noticed more blow by than usual coming from the breather tube. I checked the oil level and it was a little over full. I was at the end of my oil change so I dropped the oil and pulled a oil sample. I sent the oil to Blackstone Labs and they found 1.1% anifreeze in the oil but they also found 9.0% fuel. The copper, lead, and tin levels were also well above normal standards. I pulled a water sample the other day and it was within specs for additives. I know it is very possible that I have a leaking O-ring around one or more cylinder sleeves and that is more than likely my source of antifreeze, but how am I getting so much fuel in the oil. I only put about 4000 miles per year on this truck and I need it for harvest in a few weeks. On the advice of the Blackstone technician I am going to run the truck with the fresh oil change and pull another sample after harvest. After changing oil the other day I took the truck for a 5 mile drive, after sitting for a few days I checked the oil level again and it is almost a inch above the full mark. The water level has not gone down any so it has to be fuel in the oil. Where could the fuel be coming from? None of the injector lines are leaking where they go into the heads. Any help would be great...Thanks!

Well the mechanic got my fuel leak fixed. He pulled the injectors out and he found a small amount of corrosion in the cup of the injector where the injector line meets. He cleaned the mating surface with a scotch brite pad and that seemed to do the trick. He also changed the orings right away. Thanks for all the help.

Just a update-I spent four hours working on the injection lines that were/are leaking. I took everything loose and pulled the injection lines, cleaned and inspected the end of the lines and also made sure it was clean inside where the injection line meets the injector. I put everything back together, taking care to make sure the lines went back in nice and straight. All this work and guess what-they leak just as bad now as when I started. I am almost certain it is the orings on the injectors that is leaking fuel. I debated pulling the injectors but I pulled the valve cover off and it looks like the whole rack has to come out to get down to the injectors. That is more than I care to take on right now so I am gong to send the truck back to the mechanic that replaced the head gasket. I will update again when we find out exactly what is wrong. Thanks for all the advice.

OK so I called the local Mack dealer today, the one that I got the new lines from. I talked to the service manager about my problem, I asked if there was any kind of a oring kit or anything for where the injection line meets the injector. I was told that there was nothing, I was told that where the injection line mates with the injector it is metal on metal. His advice was to loosen the line again and then tighten the living crap out of it. So who is right? I guess I would think that there should be something to seat the line to the injector. Like I said before, I just had the head gaskets replaced, to my knowledge the injectors where never taken out-just the lines taken off. This is on a 92 E7 400. Thanks for the info and for the record I think you guys know more than the local service manager.

Ok-So do I need to pull the injectors out to put the orings in?

Hello-I am working on a 92 CH613 with a 400 E7. I just recently had the head gaskets replaced and now the fuel injection lines on cylinders 1 and 2 are leaking. They are both leaking out of the head where the injection line is threaded in. I loosened the outside nut and tightened the stud thinking this would help stop the leak. The fuel is coming through the threads of the stud that the fuel line goes through into the head. Next I was told that this was common anytime the fuel lines are taken off and sometime the only way to get them to stop leaking is to replace the lines. So I bought two new injection lines for cylinders 1 and 2 and I installed them today. Guess what they both leak! I am thinking it is something on the mating surface of the injector where flanged part of the injector line meets. Is this possible? What should be my next corse of action? Thanks.