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Old 05-23-2019, 10:34 PM   #1
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Oil dump

New to Diesel engines and bought a 1992 transit bus with a Detroit engine for conversion. A problem (I assume) there is a small cylindrical tank (about 1 gal) near what I think is next to the main oil tank l, there is a bolt with a tube going up into the tank(so maybe this is an overflow device?). When the bus is running and I press on the fuel peddle to accelerate oil dumps out of this tank. Like a half a cup at a time. Can someone tell me what’s going on?
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Old 05-24-2019, 03:32 AM   #2
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Join Date: Jun 2016
Location: Orange County, CA
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Year: 1990
Coachwork: integral
Chassis: Crown Supercoach II (rear engine)
Engine: Detroit 6V92TAC, DDEC 2, Jake brake, Allison HT740
Rated Cap: 37,400 lbs GVWR
That is the so-called "slobber" tank that collects accumulated oil from the airboxes. There are two tubes feeding into this tank that come from the two cylinder banks' airbox drain valves; these valves allows oil to be blown out at slow idle engine revs, but at any revs above that the valves should close. This tank must be drained at every oil change. The drain valves also need to be checked for proper operation, and cleaned if they're stuck open or closed.

If you're getting half a cup of oil every time you press the accelerator pedal, something is wrong, very seriously wrong! There should be no more than a few drops coming out at low idle.

John
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Old 05-24-2019, 03:37 PM   #3
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Join Date: May 2016
Location: Eastern WA
Posts: 5,770
Year: 2002
Coachwork: Bluebird
Chassis: All American RE (A3RE)
Engine: Cummins ISC (8.3)
Rated Cap: 72
My 8v71 didn't have a slober tank. Just a hose coming off of each side .

Every time I started it, it would leave two, half dollar sized spots of oil on the ground. Marking it's territory
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Old 05-24-2019, 04:19 PM   #4
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Location: south east BC, close to the Canadian/US border
Posts: 2,265
Year: 1975
Coachwork: Chevy
Chassis: 8 window
Engine: 454 LS7
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Oil doesn’t dissolve in water. It lasts a long time and sticks to
everything from beach sand to bird feathers. Oil and petroleum
products are toxic to people, wildlife, and plants. One quart of
motor oil can pollute 250,000 gallons of water, and one gallon
of gasoline can pollute 750,000 gallons of water! Oil that leaks
from our cars onto roads and driveways is washed into storm
drains, and then usually flows directly into a lake or stream.
Used motor oil is the largest single source of oil pollution in
lakes, streams, and rivers. Americans spill 180 million gallons
of used oil each year into the nation’s waters. This is 16 times
the amount spilled by the Exxon Valdez in Alaska!
http://www.montgomeryswcd.org/Attach...0Pollution.pdf
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Old 05-24-2019, 05:54 PM   #5
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Join Date: Jun 2016
Location: Orange County, CA
Posts: 867
Year: 1990
Coachwork: integral
Chassis: Crown Supercoach II (rear engine)
Engine: Detroit 6V92TAC, DDEC 2, Jake brake, Allison HT740
Rated Cap: 37,400 lbs GVWR
And one piece of advice for anyone not familiar with Detroit 2-strokes:

DON'T

LUG

IT !

You do not drive a Detroit like you would drive a typical 4-stroke - if you do, bad things will happen. Feed it the correct CF-2 straight 40-weight oil (and nothing else), keep the revs up, watch your temperature gauge like a hawk, make sure your cooling system works well, and DON'T LUG IT. They're very good engines if you know how to use them correctly, but will cause you untold grief if you mistreat them.

John
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Old 05-31-2019, 02:59 PM   #6
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Quote:
Originally Posted by Iceni John View Post
That is the so-called "slobber" tank that collects accumulated oil from the airboxes. There are two tubes feeding into this tank that come from the two cylinder banks' airbox drain valves; these valves allows oil to be blown out at slow idle engine revs, but at any revs above that the valves should close. This tank must be drained at every oil change. The drain valves also need to be checked for proper operation, and cleaned if they're stuck open or closed.

If you're getting half a cup of oil every time you press the accelerator pedal, something is wrong, very seriously wrong! There should be no more than a few drops coming out at low idle.
John

Can I assume that my first step would be to drain the tank and give it an oil change?
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