Oil leaking after oil change on 6v92t

[Geoff]

oil is cheap  

Oil is cheap, but the mess on your toad and the back of your bus isn't easy to get off.
Oh, and the term "sl**ber tubes" is a misnomer created by truck drivers back in the day, just like "318" meant an 8V71 rated at 318HP, although they were really only rated at 304 HP with the standard N65 injectors. 

--Geoff

[bigred]

If oil is getting on the toad and on the back of the bus ,there is definitely a larger problem because if this is happening it is "slobbering"when the bus is in motion.Mine will drip a bit a slow idle but if you go to fast idle or put the bus in motion the dripping will disappear almost immediately.Another thing that I have found out about the 8V92 is that if someone slips up and puts multi viscosity oil in one of these things ,it is almost like driving pt with the drain plug removed .   

[Iceni John]

If oil is coming out of the airbox drain tubes when driving, it probably indicates that the two airbox drain valves are not closing when the engine is at more than idle.   Inside the valve is a spring-loaded disk that allows air to flow through at low idle, but at higher pressures such as above fast idle it should block airflow.   These valves can get grunged up inside so they never close properly  -  I suggest removing each valve, disassemble and clean, then reinstall with a slight down slope to where the 3/8" hose attaches to its output.   If you have a short length of clear tube in the drain tube to the collection container you can then easily see what each airbox and drain valve are doing at different engine speeds.

John

[luvrbus]

There are 3 different valves the 900 rpm closing ,1000 rpm and the 1200 rpm the new valves are non serviceable fwiw

[Geoff]

 I should have mentioned when the oil control rings get weak and start pumping oil into the airbox, you have excessive blow-by so oil leaks out almost everywhere there is an old gasket as well as the air breathers.  Even more so with the check valves closed.  The older Detroits didn't use check valves, and it is a 92 Series old oil ring problem.  The 71 Series lose compression when they get tired, the 92's start pumping oil when they get old but keep their compression longer.
 
--Geoff

Oil is cheap, but the mess on your toad and the back of your bus isn't easy to get off.
Oh, and the term "sl**ber tubes" is a misnomer created by truck drivers back in the day, just like "318" meant an 8V71 rated at 318HP, although they were really only rated at 304 HP with the standard N65 injectors.  

--Geoff

[N31569]

So, I have drove the bus 75 miles to bring it home. The oil level is still at the full mark, I don't have any puddles now when it idles (just that one time). But I did notice some air blowing out of the one tube on the passenger side.  I didn't notice it so much in the drivers side. Is this normal, or should I be looking at something else?

Jason

[lostagain]

Jason, sounds like a good and healthy engine to me. It was slobbering at first because of idling. Then you take it out for a good run and cleans up. All is good now. The one side blowing more is probably the check valve. Take it out, clean it, or replace it.

JC

[N31569]

Thanks, I'll do that.

Jason

[Geoff]

So it was 5 minutes of idling that caused the engine oil to drop out of the air box drains too long?  I have an engine air box catch cannister and might get a table spoon of water and oil out of it in 5,000 miles.  And I idle it a lot longer than 5 minutes.  The cannister came with the bus, and the engine has 75,000 miles on it since a complete overhaul.

--Geoff

[DoubleEagle]

There are 3 different valves the 900 rpm closing ,1000 rpm and the 1200 rpm the new valves are non serviceable fwiw

Are there markings or part numbers on them to distinguish which check valve you have? I got some as part of a kit, and there was no mention of what level they were. Should I assume the 900 rpm would best if fast idle is 1000?