dieselpowerstroke

Thanks gentlemen for your knowledge. I have a better understanding already. I will have to search for an engine manual and get one, now I want to learn about this engine for myself, just because now I KNOW they are lying to me about it. We bought this truck from another place, a used truck dealer. Talked to the owner about it, and since this truck has so many issues, he is willing to allow us to switch it for another truck on his lot. Very unexpected of him but a very good business move to keep our business. He doesnt seem worried about our truck at all, says he will throw a used engine in it and it wont be a problem to resell. So when the Volvo/Mack dealer is done dicking around with the truck, we will pay their stupid bill, throw an absolute fit at them armed with the knowledge you guys have given me, then go swap the truck out with the used truck place. Might try a different brand this time. Thank you very much for all your input everyone, I very much appreciate it! Im sure this thread will help someone else in the future! Whenever they get the truck done, i will let you guys know what BS they try to feed me on the way out of the shop.

Thank you for all the replies! I am a new member and hit my posting limit yesterday so I couldnt respond until now. You gentlemen seem to really know your stuff here and I very much appreciate the advice! I have worked on big diesels for many years, but never on Mack engines so thats why I am questioning these things. They didnt sound right to me either. I just wanted to clarify some things here to make sure I am not being dumb or mistakenly using wrong terms. Is the injector cup and injector sleeve the same thing, just a different name? Or are they two different parts? I had assumed they were the same thing. The dealer didnt use the word 'cracked', but said the injector sleeves leaked coolant, #4 leaked a little at the far end of it and #3 leaked worse when they got to it. Said they could blow shop air in it to clean it off and #3 would pool coolant back up immediately under pressure where #4 slowly bubbled. They said when they removed my original high pressure injection lines, that the nozzles cracked. So i am assuming that means right in the side of the head that the lines thread into? So they were going to put 6 new injectors in it. Are there pass throughs that the lines thread onto, or do they thread directly into the injector body? Thats also my thought on why he said they might slobber a little oil, if theres a pass through that doesnt seal. But thats why i was confused, i knew they were fuel lines but had assumed its a dealer tech, he certainly knows more about that engine than me. And yes, he specifically said the cylinder liners, after head removal, would be too high and they wouldnt be able to cut the counterbore enough to lower them into spec, resulting in headgasket failure. That seemed way off to me. But again, not a Mack engine guy so I let him talk. So he says that just means you would need a reman engine, and I told him no way. Because if you cant get my counterbores cut down, how did they do it on the reman engine? Thats when he started talking about something else haha. So upset with this dealership right now.

No, by sleeve i meant injector cup. Pardon my incorrect terminology there. They were telling me the cups were leaking coolant. If they are correct, that would allow combustion pressure into the cooling system if the injector sealing washer let it leak past, correct? But that theres no replacing them because they are machine fit into a reman head. I have never heard of that in my wrenching career. And yes, the lines just have bubble flares i believe. He was saying they could use orings to help seal them. So it seems they are willing to hillbilly my new injector lines to make them seal to the cracked nozzles. Like, really? But also he said afterwards, they would just slobber oil slightly down the side of the head and block worst case, but they wouldnt leak fuel. Im so confused. And i think they want me confused.

To finish the story, dealer calls back later the same day and says number 3 sleeve is leaking worse, they had pressure on the cooling system to check that. I said theres no way we are doing both reman heads or even chancing needing a reman engine. He says i understand. I think your best bet is for us to return the new injectors and reinstall the old injectors, and i think we can get the new lines to seal with some orings to the point that they will only seep oil, not really leak much. I said yes, thats what i wanted you to do in the first place! And now i havent heard a word out of them in a week. They have had my truck for three weeks now. So frustrating and the dealer is trying to take us to the cleaners.

Oil is black, doesnt seem to have coolant in the oil. Just pressurizes and pushes coolant when driving. Never would idling in the lot. New 16lb cap and it still blows it out around the cap and fills the overflow. When i get the truck back i will do the test you suggest. Thank you for that procedure!

We are in northwest Ohio.

Recently bought a 2006 Mack CXN with the ASET AC350, Allison auto. 265k miles. Developed a coolant pushing issue first. Was told to do the single coolant tank update. Havent done that yet. Found some safety recalls needing done, had the local dealer do the headlight switch and harness update, and the fuel injection lines as free safety recalls. They called me a few days later, saying when we removed the injection lines, 4 of the 6 injection nozzles cracked. We usually have these issues doing the lines. If they would have told me that, i would have said dont do the recall. Too late now. So they want to put 6 nozzles in and charge me $2500 because the recall only pays the $800 worth of lines and 3 hours labor. Ob a saftey recall, if anything breaks, Mack will not cover it. Again, wish they had told me that beforehand. Then another few days they call me again, saying the injector sleeve in number 4 is leaking coolant alightly, this should be the coolant pushing concern. Okay. How much to install a new sleeve? They tell me on that engine you cant replace sleeves, you have to install a reman head. And when they do that, he says they know the liner protrusion will be too high and they usually cant cut the counterbores enough to get back into spec, so that means we would need a reman engine. Now wait a minute! That spiraled out of control in a hurry! Is that correct info? You cant replace sleeves separate and cant make the liners sit right after pulling the head?? There is no way we are putting that money in an 06. Very nice truck but they also told me the EGR cooler is discontinued from mack and the front aluminum water pump housing cover is discontinued. So i have a nice low mileage boat anchor with diminishing dealer support? Anyone knowledgable that could help me with thoughts on this?