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Author Topic: Slobber tubes redirected to oil pan  (Read 3265 times)
basil
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93 Eagle 15-45, 89 Bluebird All American FE




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« on: March 23, 2011, 03:37:13 PM »

I am the question guy today

Mechanic recommended redirecting slobber tubes to oil pan.   Said he did this on fleet of 2 strokes for 30 years.

Bad idea?

Keeps pavement clean(er)
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thomasinnv
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« Reply #1 on: March 23, 2011, 03:41:52 PM »

I believe that was the recommended method some years ago, but not so much now.  Some have talked about the contaminated oil being put back into the engine.  I would either use tubing to direct them into catch containers or install check valves.
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1977 MCI Crusader MC-8
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Busted Knuckle
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« Reply #2 on: March 23, 2011, 03:52:08 PM »

Catch containers is the way to go!
At one time it was they did it. But DD put out a bulletin and kit to change it due to the possibility of coolant getting in the oil pan and washing out the bearings in the event of a O-ring, liner, or after cooler failure or even blown head gasket or a cracked head.
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Busted Knuckle aka Bryce Gaston
KY Lakeside Travel's Busted Knuckle Garage
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luvrbus
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« Reply #3 on: March 23, 2011, 03:52:50 PM »

 Basil 30 years ago was about the time DD issued a service bulletin telling you not to that and you with a 8v92 no way you need those open that was a CA thing for transit buses as Cole always said why cover up the best diagnostic tool you have for a DD lol  


good luck  
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TomC
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« Reply #4 on: March 24, 2011, 07:16:27 AM »

I've done a bit of research into this.  Airsep-who makes boat engine room closed breather systems-also makes coalescing breather systems for diesels (the EPA considers engine blow by to be part of the smog output of an engine now).  What it is-you feed the valve cover and block breather tubes to this can looking thing that has a filter in it.  Through condensation, it separates out the oil and sends it back to the oil pan.  The crankcase pressure is plumbed back through the engine intake where it actually creates a vacuum pulling the pressure in the engine down (many have reported a lowering of oil consumption).  Airsep makes various sized units for different sized engines.  Any inside emergency generator will have this system on it.  The cost for my 8V-71-about $1,500.00! (and you have to change the filter periodically).  I'm making my own system.  Using an unused gallon paint can, I'm going to punch three 1.25" holes in the lid for the valve cover breather, block breather, and then breather to the road. Then also have a ball valve drilled through the base to empty it periodically. Cost-less then $200.00 (1.25" hose is expensive).
Airsep also makes a special catch can for the two blower weep lines.  It's about the size of two coffee cans stuck together and also has a ball valve on the bottom to empty it.  As Airsep said, you don't want to recirculate the slobber from the blower tubes-can be rather nasty.  That can is about $300.00.  Good Luck, TomC
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Tom & Donna Christman. '77 AMGeneral 10240B; 8V-71TATAIC V730.
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« Reply #5 on: March 24, 2011, 07:57:20 AM »

It would be easy to get some 6" thin wall pipe 6 to 8 inches long and make one stronger than the coffee can..... mig weld it and your bracket mounts to it.. should be a fast job. anyway, thats how I would do it.
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Don Fairchild
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« Reply #6 on: March 24, 2011, 09:17:27 AM »

Basil, Nice to hear from you, how you doing.  The part for the slobber tank is #23506758.

Hope that helps

Don
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Lin
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« Reply #7 on: March 24, 2011, 09:58:18 AM »

This may be a slight diversion, but can slobber tube oil be used for analysis?
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thomasinnv
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« Reply #8 on: March 24, 2011, 10:01:30 AM »

I would think it would give a false result, as the metal contents could be concentrated as well as the fuel contents, acid levels etc.  some of it is after all most likely coming by the rings??  just my thoughts.
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There are three kinds of people in this world....those that make things happen, those that watch things happen, and those that just wonder what the heck is happening. Which one are you?

1977 MCI Crusader MC-8
8V71N/740
95% converted (they're never really done, are they?)
luvrbus
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« Reply #9 on: March 24, 2011, 10:06:04 AM »

If you have the enclosed type cross member on your Eagle tie both tunes into that easy job little welding but if it has the open type double layer forget about the above, the small cylinders that party stores sells for balloons make a great little catch can without much work and they will give the empty ones to you small and easy to weld the 2 fitting for the tubes 1 for the breather and one for the drain strap in it you are done  


good luck
« Last Edit: March 24, 2011, 10:21:16 AM by luvrbus » Logged

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kaptar
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« Reply #10 on: March 24, 2011, 10:32:15 AM »

Last year I purchased a 4104 in Portland Or. My wife followed me back to washington up I-5. She kept increaseing our spaceing the farther we went. Weird. When we got home I found out why. Her Magnum isn't going to rust anytime soon. The slobber tubes were just rubber hoses pointed towards the ground. Thats what happens when you buy something without having a clue what your looking at. Oh well it can all be fixed and I don't think anyone slipped off the road because of the oil slick. The fixit list is long.
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babell2
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« Reply #11 on: March 25, 2011, 10:05:59 AM »

Last year I purchased a 4104 in Portland Or. My wife followed me back to washington up I-5. She kept increaseing our spaceing the farther we went. Weird. When we got home I found out why. Her Magnum isn't going to rust anytime soon. The slobber tubes were just rubber hoses pointed towards the ground. Thats what happens when you buy something without having a clue what your looking at. Oh well it can all be fixed and I don't think anyone slipped off the road because of the oil slick. The fixit list is long.

 if it's a DD They say if it stops leaking "Its broke" or " its out of oil"
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Geoff
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« Reply #12 on: March 25, 2011, 10:19:42 AM »

If you are losing a noticable amount of oil out the air box drains (not 'slobber tubes'), your engine needs work-- it is either the blower seals or piston rings that cause the oil in the air box.  Getting a catch container is just a stop-gap fix.
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Geoff
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« Reply #13 on: March 25, 2011, 09:25:14 PM »

those sayings about leaking Detroits being ok were made up by folks who weren't maintaining their equipment.

And are perpetuated by busnuts who do the same.

This hobby goes straight to h*ll as soon as one of us goes slobbering down the right highway and the wrong person notices.

Make it stop leaking. It is possible.

happy coaching!
buswarrior
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boxcarOkie
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« Reply #14 on: March 26, 2011, 04:12:38 AM »

Must be ingrained in the male psyche, "oil leaks" are generic to any kind of device known to man.  They used to say "If a Harley did not have oil under it, it was out."  It just doesn't apply to buses only ... As long as it gets me from point A to point B in a reasonable fashion, I don't care if it has a few freckles on the back.

BCO
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