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Old 10-13-2015, 01:40 PM   #1
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Winne 2004 Journey - small (or second??) exhaust pipe

Hi,

I have a 2004 Journey diesel. There is a small pipe just right of center that fumes come out of only when the engine is running. I can't find it in any manuals or drawings. It is not the large 6 or 7 inch exhaust pipe. Anyone know what it is?

Here is a link to a photo:

https://drive.google.com/file/d/0B0L...ew?usp=sharing
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Old 10-13-2015, 02:25 PM   #2
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Quote:
Originally Posted by joeyhodges View Post
Hi,

I have a 2004 Journey diesel. There is a small pipe just right of center that fumes come out of only when the engine is running. I can't find it in any manuals or drawings. It is not the large 6 or 7 inch exhaust pipe. Anyone know what it is?

Here is a link to a photo:

https://drive.google.com/file/d/0B0L...ew?usp=sharing

I'm guessing that is the open crankcase vent aka, slobber tube. It was routed to below the radiator to keep the oily fumes out of the radiator.


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Old 10-13-2015, 02:28 PM   #3
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Do a search on "slobber tube" and you'll find hundreds of threads dealing with it ...how to prevent the crankcase blowback from getting on the toad, etc., etc.

It's essentially the crankcase breather/ventilation tube from the engine.
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Old 10-13-2015, 03:13 PM   #4
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Quote:
Originally Posted by joeyhodges View Post
Hi,

I have a 2004 Journey diesel. There is a small pipe just right of center that fumes come out of only when the engine is running. I can't find it in any manuals or drawings. It is not the large 6 or 7 inch exhaust pipe. Anyone know what it is?

Here is a link to a photo:

https://drive.google.com/file/d/0B0L...ew?usp=sharing
Joey,
As has been stated, it's your "blow-by" tube. You see, without going into the whole high school auto shop lesson on how an engine operates, suffice to say that, when your engine is running, not all the compression from the pistons doing their job of compressing air is used. Some of it get's by the piston rings and, ends up as pressure inside the crank case. Well, that pressure has to be dealt with. For yours and, a few zillion other diesels out there in this era, all the manufacturers did was, simply install a vent tube on the engine, to release all that "crank case pressure".

And, it is expelled, out of that tube. But, CAT, in the mfg of the engine, only put the exhaust part of that tube, right below the middle of the engine. Well, that caused some serious problems due to the oil vapors that were expelled with it.

So, those tubes, should be, and it appears yours was, extended to the rear of the coach so that when they vent, they cause no issues with other parts of the coach. You more than likely have a CAT 300, or 330HP engine. Both of which require a maximum of 19 quarts of oil for an oil change, including with a filter.

If there's more than 19 quarts in it, that extra amount of oil get's splashed around and, ends up entering that exhaust port of that vent tube. When that happens, it gets spewed out and, quite possibly all over the toad your towing behind your coach.

So, the point, make sure you're carrying the proper amount of oil and, your dip stick is marked and or adjusted correctly for that proper amount. Other than that, that little tube sticking out is where it's supposed to be. Good luck.
Scott
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Old 10-13-2015, 03:47 PM   #5
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Thank You

Thanks for the great answer . . I noticed a few drops of oil coming out of the slobber tube after a fairly long trip. I was worried . . . now not worried . . .Thanks again
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Old 10-13-2015, 06:20 PM   #6
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I added an extension the slobber tube on mine and it comes out in the same location. I'd guess that a previous owner extended the tube - as others have mentioned. On mine I added a small plastic bottle and put steel wool in the bottle the thought being that the moisture will cling to the steel wool. I was that bottle at every oil change.
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Old 10-14-2015, 01:52 PM   #7
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I guess technically it is an exhaust pipe, for the crankcase. Great explanation FIRE UP!
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Old 10-14-2015, 06:17 PM   #8
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I guess technically it is an exhaust pipe, for the crankcase. Great explanation FIRE UP!
Why thank you Sir, very much appreciated.
Scott
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