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Old 11-28-2017, 02:17 PM   #1
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Droplet oil leak next to oil pan in DP

I noticed some small oil leak droplets at the rear of our 2007 Newmar Essex when I picked it up from storage today. Quick inspection only showed this small pipe with exhaust fumes coming out next to the oil pan? Never noticed it before, is this a vent pipe of some type or a connector that has come lose? I did not see any logical place to reconnect? Any ideas.... Click image for larger version

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Old 11-28-2017, 02:31 PM   #2
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The older diesels (before all the emissions requirements) had a tube that comes off the valve cover or crankcase (called a Slobber Tube) to allow "blow by" gasses to vent to atmosphere (go onto ground). That's where the name "Road Oilers" came from when talking about the old Detroit Diesel 2 stoke engines (as they had a lot of blow by).

Usually there will be a trace of fume and some signs of oil - in a normally running engine.

If the engine has a lot of blow by (i.e. worn piston rings) there can be a significant amount of blow by. See this example - go to the 8:30 minute mark at the end

In that case you have a problem. But for a few small drops and a little smoke, it is not an issue.
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Old 11-28-2017, 02:34 PM   #3
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It's probably a road draft tube. It vents the top of the engine where there is supposed to be little or no pressure. It will slobber a little.
If you can see what it is attached to there may be a cap that can be disassembled with a steel mesh filter inside.
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Old 11-28-2017, 03:29 PM   #4
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Sounds normal,people make all kinds of things to put on end if it gets on your toad.
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Old 11-28-2017, 05:36 PM   #5
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Thanks to all! First time I have seen any “slobber” coming out. Will monitor and check to see if there is a cap on the valve cover. Glad it wasn’t unhooked from something.... cause I didn’t see anything that looked like an attachment.
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Old 11-29-2017, 09:25 PM   #6
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Some of the vapor comming out of the engine vent / slobber tube is moisture and is normal if there is a little oil mixed with moisture and it is splashing or blowing on to the engine bottom or the coach you could add a hose to get lower to the ground but not low enough it drags or kink when driving or when the air tanks are drained.
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