Cat Engine Overhaul

Not sure who you are asking? I think I pretty well described what I do.

 

are you getting a lot of blowby and oil (non-acert) out the breather tube?

 

I have an mbn that was rebuilt at cat approximately 3 years ago by the previous owner. It uses 1 gallon oil every 6500 miles. On my job it idles a lot. Seems to be a common thing. My 2ws only used oil when it was overdue for a change. 04 I'd be getting it reflashed if that's possible. Mine ran hot when it was first installed but I don't think it ran that hot. After reflashing I can drag it down to 1100 rpm climbing grossing 139000 and it won't go over 900. Not a huge difference in power and mileage (1/2 mpg improvement) but just a lot nicer to drive.

 

Every cat I ever owned, A model,Bmodel,E model and c-15 all used about a gallon of oil between oil changes. 10,000 miles. My B model I would run up to 950-1000 on pyro and all others 1100 or 1150 on short pull.
Used jobber parts on an inframe once. It used 5 gals of oil between oil changes. Rebuilt it again under warranty with cat parts and went back to 1 gal between changes.

 

Thanks for the feedbacks everyone. fishell, I used the platinum kit from cat, so all genuine parts. My mechanic took all the cylinder packs apart and checked everything, a very thorough fellow. Mine is running the 1mm file. It's amazing how much the ambient daytime air temperature affects egts. The warmer it is outside, the closer I have to watch it, and the higher I have to run the rpms to keep egts down. Someone in a different forum suggested my BW 17963 turbo should have a smaller housing? I don't know, maybe it's something I can try at some point. The engine pulls great, just can't run it at the old rpms of 1200-1450 like when it was an mbn. Mine has to idle a lot too, during loading I have to move a few feet every few minutes, plus keep pumping air for 14 air bags. Special k, are you running the same turbo? I wonder if I should have had the 6nz rather than the 1mm flash. Superhauler, I am not actually sure on your question, but good point. I am going to be checking. I think most of my oil is going up the stacks though, because it smokes blue when idling, and you should see the smoke show after I take off, after idling to load for an hour.
After 2 or 3 miles it's burned off all the oil which accumulated in the exhaust system, and then it seems to run clean. As I mentioned above, I am only 2000 miles and 100 hours since the rebuild, so it's too soon to panic and make a drastic diagnosis. I will continue to monitor consumption and record, so that I can hopefully observe a lessening of oil burned. Note to forum mods, this is a canada truck, shouldn't be anything in this post warranting deletion.

 

Lowmax I'm running the stock turbo with a max boost of 35 or so. Mine smokes a little on startup also for a couple of min. Nothing terrible but enough to notice. Up north when it's -30 and it idles overnight you get that whiff of raw oil smell for a mile or so than its gone. I think it's in the head because when we had to change the turbo gasket you could see the back exhaust port was noticeably darker than the front one. Couldn't tell whether it was fuel or oil though. The truck was parked overnight and then pulled into the shop cold. I suspect oil running down a valve stem into a cylinder. DDS did my flash but it's not a 6nz. I'm not sure what it is exactly but my ecm id is still mbn.

 

Could take a long time to break in.

On the bright side, with all that fresh oil you keep adding you can extend your oil drain intervals!

 

I like your optimisim! Lol. I think you are right as far as the oil goes. It is essentially getting changed on the fly. Good news, just came in from checking it, and this time it's only down 1.5 litres in the time that it has usually been down 4.5 so that's a good sign. Going in the right direction, finally.!

 

To me it seems excessive but I dunno. Mine burns a gallon every 6,000-7,000 miles between average 11,000 intervals since the inframe. 110,000 miles on the inframe now and it's not gotten worse or better. It used to not consume it like that before the overhaul it would sometimes go down to the add mark when 11,000 rolled around. Unless I had circumstances with a lot of excessive idle time which makes any of them burn a little.