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Author Topic: Air box drain question  (Read 5758 times)
steve5B
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« on: May 04, 2009, 05:54:29 AM »


  As formentioned in a previous post, "Make sure your drain tubes are not clogged or pinched", I was wondering does this pertain to

   every engine or just the 6V-92?


    Steve 5B....
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JackConrad
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« Reply #1 on: May 04, 2009, 06:12:09 AM »

This would apply to all the DD 2 stroke engines  (53, 71, 92, and 149 series engines).  Jack
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steve5B
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« Reply #2 on: May 04, 2009, 08:51:16 AM »



    Jack, thanks for the reply, are these tubes the ones that are called "BLOW BYE" that hang down below the engine?

    I don't know anything when it comes to mechanics!


   Steve 5B.....
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« Reply #3 on: May 04, 2009, 08:57:40 AM »

Steve to answer your question, yes and if you do like I did and that was to make the tubes actually touch the ground, you won't get near as much mess on the back of your bus. The ground will wear them down to where they need to be! Since doing this, my bus and engine stays a lot cleaner!

Ace
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JohnEd
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« Reply #4 on: May 04, 2009, 12:09:14 PM »

 just spreading oil on the waters
The DD factory fix is a container set up that collects the tube outflow.  Never saw that one but I have seen 5 pound coffee cans hanging off of the drain tubes.  Those collect the run off and let you dump it when needed.

Ace's idea is really great unless your engine is putting out a lot of oil.  In that case you might not want to have the oil messing up your driveway....or anyone's you might visit.  I would even give some consideration to not leaving oil in the Wally Mart hospitality suite.  Still, that method would keep your rig cleaner.

Just spreading oil on the waters

John
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JackConrad
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« Reply #5 on: May 04, 2009, 12:21:58 PM »

   Jack, thanks for the reply, are these tubes the ones that are called "BLOW BYE" that hang down below the engine?
   Steve 5B.....
I think the "BlowBy" tubes are the ones from the breather on each valve cover (or single valve cover on an inline 6 cylinder). They are approx 1" in diameter. The air box drains are attached to the block towards the rear of the engine and under the exhaust manifolds on V block engines (not sure on inline engines).  Jack
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« Reply #6 on: May 04, 2009, 02:46:18 PM »

You are correct Jack they are "crankcase breather tubes" the slobber tubes on my 71 are plumbed back into the pan from the factory and work well.>>>Dan
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Utahclaimjumper 
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Airbag
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« Reply #7 on: May 04, 2009, 03:23:44 PM »

I wonder why we could not plumb the breather into the induction like this system does. I know many of you have gone to a different air filter than the original oil bath stuff. Or even just a cyclonic air oil seperator that drains back to the crankcase.

http://www.yachtingmagazine.com/article.jsp?ID=1000068942

http://www.walkerairsep.com/

Extra Extra
http://www.walkerairsep.com/news_article.asp?id=15
« Last Edit: May 04, 2009, 03:33:54 PM by Airbag » Logged
JackConrad
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« Reply #8 on: May 04, 2009, 03:40:51 PM »

Here is a labeled photo of the air box drain tube and the air box access covers on the passenger side of our 8V71. Jack

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« Reply #9 on: May 04, 2009, 03:59:38 PM »

hi,
i have an "official" detroit air box collector on my silver'92, works like a hot damm, no mess on the back end ever. there  is also a check valve fitting on each bank that opens  at a spec pressure.
detroit took off the lines connected to the oil sump- something to do with crap in the oil ,i think
i think i paid about a $100 for the kit whe i did  the major o/h on engine
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« Reply #10 on: May 04, 2009, 04:12:13 PM »

hi,
i have an "official" Detroit air box collector on my silver'92, works like a hot damm, no mess on the back end ever. there  is also a check valve fitting on each bank that opens  at a spec pressure.
Detroit took off the lines connected to the oil sump- something to do with crap in the oil ,i think
i think i paid about a $100 for the kit when i did  the major o/h on engine


Here is our homemade drain tank.  3" PVC with 2 barbed fitting for the rubber tubing to connect the slobber tube drains, a hydraulic tank breather and a drain petcock in the lower end.  How does this compare to the DD unit?


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silverbusman
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« Reply #11 on: May 04, 2009, 04:22:44 PM »

jack,
your homemade tank looks pretty close to what i have from detroit.mine is a bit more compact, but is still going to work the same as yours .i just got lazy and didn't feel like building something that wasn't much anyway
george
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JackConrad
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« Reply #12 on: May 04, 2009, 04:33:01 PM »

jack,
your homemade tank looks pretty close to what i have from Detroit.mine is a bit more compact, but is still going to work the same as yours .i just got lazy and didn't feel like building something that wasn't much anyway
George

OK, having never seen the DD unit, I was just curious whether mine was similar.  Thanks, Jack
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gus
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« Reply #13 on: May 04, 2009, 06:28:37 PM »

My airbox drains, like Ace's, also are rubber tubes going all the way to the ground.

This takes care of the oil on the bus rear but still makes a mess in my friend's driveways so one day I plan to make one of those neat PVC drain collectors.
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PD4107-152
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« Reply #14 on: May 04, 2009, 06:47:26 PM »

Looks like those tubes could get clogged pretty easily.  They also look maybe not so easy to get to.  Guess I'll have to dig into things and see what the story is, then hope that fixing them solves my start-out problem.
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