Originally Posted by doc
Had a 300 Detroit in a Freightliner chassis (2000 Itasca Horizon) tube was not below the radiator and the oily smoke was blowing on the radiator and attracting road dust dirt and debris. Over heated a long pulls but within 5 minute is as back to normal temps. Temporary fix was a handful of quarters at a spray carwash and a lot of degreaser.
Freightliner factory shop in Gaffney put an extension on it and cured the problem.
You had a "Detroit" diesel in your 2000 Itasca? Wow, as long as I've been involved with diesel coaches, I've not heard of a Detroit in an Itasca in the 2000 era coaches. Every one that I've dealt with, especially with a Freightliner chassis, had either a CAT or Cummins. If yours had a Detroit, that's certainly news to me. I know the old "OLD" bus type converted motorhomes used the old 6V53 Detroits and some might have even used the 8V73 versions. I don't know of any coaches with the 8V92 series engines but, I suppose they might exist. But, a 2000 Itasca, with a Detroit, hmmmm.
Originally Posted by littlebob
I have a 05 bounder 34n with a Cat. 300 eng, I keep reading about a slobber tube. Can somebody tell me what it looks like, and better yet post a pic. Im in my high 70s and cant crawl around like I used to.
The term "Slobber Tube" is a loose term used for the Crank case vent tube. It's also known as the "Blow-by" tube. I don't know if you know a ton about engines or not, especially diesels, but, ALL engines, by virtue of they way they operate, create internal pressure, inside the engine block. That internal pressure has to be relieved or, some form of damage is going to take place. Although the principle of operation is the same, I can't speak for Cummins but, on a CAT engine, for years they vented that crankcase pressure via a tube, that emanates from the upper section of the engine, about mid length and, vertically travels straight down, and was abruptly cut off, about the middle of the oil pan.
Now, in general, that pressure generated inside the engine, "may" also contain an oil mist. Well, if the pressure is expelled out the end of that "Blow-by" tube, guess what's also going out of that tube, yep, OIL MIST. The manufacturers of the engines, have done their best to alleviate the oil mist problem but, the internal crankcase pressure still exists.
But, still, in some cases, the oil mist is still there and expelled out that blow by tube. So, if that's the case, your engine fan, acts like a giant vacuum cleaner, sucking up all the dust/debris/mud/leaves/plastic trash bags and more, ALONG WITH THAT OIL MIST, and just where is the air that is generated by the fan to go? ON THE RADIATOR FINS and CAC fins, for cooling. But, oil and dirt don't play well together so, after a while, if that oil mist issue is not absolved, you'll have some clogged up radiator and CAC fins and that Sir, will lead to higher engine operating temps, especially on hills/grades.
So, what CAT and, many of us MacGyver types have done is, EXTEND the tip of that blow-by (slobber tube) to a point at or very near, the rear of the coach. That way, if, IF, you still have oil mist coming from it, it will not get into those fins. Of course, one of the main potential reasons for the oil mist to be present is, an improper (excess) amount of oil in the engine. One has to make darn sure that the proper amount of oil is placed in the engine after an oil change. Hope this info helps some.