Originally Posted by browntom
I own a 2006 Fleetwood Excursion with 350 Cat Engine (C7) has anyone had excessive oil from breather tube that covers your towed vehicle. I am told this engine does not break in until around 70K miles and the rings have not seated yet, now have 45K. I have extended breather tube down which helps, any ideas.
First off, who ever told you that these engines don't break in 'till around 70k needs to be re-schooled. Todays engines, have all the "break-in" characteristics built right into them from the git-go. There is a slight "seating" of the rings when the engines are brand new but, based on the operating range of, light cruising, to extreme long distance grades, exhaust brake use on and off, and much more, your engine was "broke in" a long time ago.
Second, one of the very first things you need to check on is, do you have the correct amount of oil in your particular engine? You see, the oil level in a CAT is fairly critical. Most C-7 engines, be it a 300, 330 or, 350 HP version, utilize the shallow oil pan. Some may differ but, it seems by far, the majority are using the shallow pan. And that pan, coupled with that particular engine, is designed for 19 quarts of oil, PERIOD!
When the oil is changed, including the filter, not a drop more than 19 quarts is installed. And, if you or, the previous owner (if there was one) has not accurately marked the dipstick for the 19 quart oil level, then it must be done. Unless you have some problem with the operation of that engine, you will take care of 99.9% of that problem with that correction.
Now, it's been mentioned about extending your blow-by tube. Yep, that's a definite. The main and primary reason for doing that is, to reduce or, possibly eliminate the "coating" of the CAC and Radiator fins from blow-by oil film and the succeeding dust/debris that follows the coating. The result is a goo that coats and, eventually completely clogs those fins, resulting in higher operating temperatures for the engine.
Usually they (the higher operating temps) manifest themselves on grades, especially if the ambient temp is or, hovers in the higher ones like say, around 90 degrees or higher.
So, extending it, out to the back of the coach, if it IS still spiting out any fumes, will at least not coat the radiator and CAC fins. You might get a few droplets on the toad but, who cares, that's easy to clean off. The cleaning of the CAC and Radiator that is fully clogged is one serious pain in the a$$.
So, first things first, get that dip stick calibrated for 19 quarts, IF YOU'RE SURE YOU'VE GOT THE SHALLOW PAN! Then, if it's not been done, get your blow-by tube extended. Your problem SHOULD go away after the first one.