Last fall I mounted a can/ rubber hose/ two hose clamps/ steel wool/ and one 5/16-18 bolt & shake proof nut on the "slobber" tube on our 8.2 DD engine. Last nite I took it off to check how it was doing. Turns out the steel wool was wet with oil residue and, after pulling the wool out, there was almost 3/4" of what looked like water in the can. Now where did THAT come from? Condensation?
This liquid has convinced me to go the 1" ID hose out the back end! Then I can quit worrying about the water can affecting the engine.
That would be my guess. Hot moist air from engine venting out the tube into a cold can - perfect conditions for condensation in the can.
I put one of those catch cans on our coach 'bout a year ago - made it out of a aluminum welding rod container - guess I need to check ours!
Condensation or road splash depending on where the can is located.
And, it would take VERY little water to get your attention, as it would never evaporate because of the oil on top of it. Very normal.
Not road splash in our case, as we do NOT drive in the rain if at all possible.
I wonder if putting a 1/8" diameter hole at the low point in the slobber can would let the condensate drip out? It would be covered with the steel wool and yet let moisture seep thru. Might be better for those of us that "forget" to check.
This way we would help communities maintain their roads by oiling them. It would also contribute to preventing burnouts and squealing tires. >:D >:D
Why are you putting a can there? Does it help anything?
Rick,
Some members believe putting a catch can on the crankcase vent tube reduces the amount of oil residue that builds up on your towd. I have had one on our coach for a couple years, and don't really notice much difference in the "dirtiness" of our towd. Unless you run your engine oil level too high, you shouldn't get much oil out the vent tube. I think most of the trash on our towd comes from road grime, oil and other fluids thrown up by the tires, exhaust pipe emissions, and "stuff" blowing out the purge valve of our air dryer. Others may have different thoughts...
Excess blowby from the crankcase vent is an indication of engine wear. If you are seeing oil on your toad find out why sooner than later.
I have the 8.3 cummins 12 valve engine,my vent tube runs down the engine to near give or take where the oil pan gasket is.
Now think for a moment,it would take a whole lotta air and wind to get oil from the end of that tube to your toad vehicle
under normal circumstances.If you have oil from the tube getting on your toad you have a problem of excessive blowby.
Catch cans are mostly done on coaches that have rear radiators.
When I built my catch can made of pvc I also added a ball valve on the bottom. I drain it about every 10,000 miles. ^.^d
Bill
I put one on this rig before our trip. The 8.3 uses some oil and I wanted to make sure that it was not overfilled. After about 1,800 miles there's just a bit of residue on the bottom of the can. On another rig, I also used one to determine proper calibration of the dipstick. Turned out it was off by quite a bit.
jor
The catch can's main function is to capture any--ANY-- oil that comes out and that may be sucked up into the engine fan and then blown into my rear--REAR---radiator. Oil in the REAR radiator will cause dirt to stick to the fins of the radiator and hence higher temps when the radiator air flow thru is restricted.
My 6/92has a factory one that Foretravel must have put on, 92series motors have vents on the side of the blocks and any oil that comes out of those vents is pushed out into solbertubes and is sent down to a catch can underneath the rear cross member. The older natural motors pre sliver 92's leaked oil like a sieve if left under a 1'000 RPMs.at idle.
I have a Dwyer digital manometer we used to check crankcase pressures with.Think I will get some specs and check pressure.
Am curious to see if the engines that have alot of "slobber" have higher pressure.
#1 cause of excessive oil in crankcase breather hose is overfilling the crankcase. Too much oil and it gets blown out!
Calibrating the engine oil dipstick will solve the vast majority of "oil consumption" issues in RV's.