| Author | Message | ||
| Al Newell (The_peregrine)
Rating: |
Crankcase Ventilation Systems. I’m considering installing a crankcase ventilation system, closed systems, to control oil mist from getting all over my toad. I have tried stopping the DD 8V71 natural from oiling up the toad for years to no avail. A fellow full timer told me about the unit which they used on boat Detroit’s to keep them clean. Basically from what I have read they change the crankcase from a positive pressure to a negative pressure by filtering and then dumping back into the system between the air filter and the engine. Parker has the system for sale and one can read about it: http://parker.com/EAD/displayCatalog.asp?menu_parkerid=46&menu_gid=124&menu_divid=-1&catid =9869&subcatid=9876&catdesc=CCV%20SERIES%20(CLOSED%20SYSTEMS)&viewtype=1&sMode=Details Also can a non-mechanic install this system? Thanks for any and all response Al Newell | ||
| TWODOGS (Twodogs)
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it's called a pcv valve...all new cars have them.. | ||
| darisb Rating: N/A |
A company called Walker Engineering has a similar system. They actually make one rated for the 8v71 models. I've been thinking the same thing. Their web site is http://www.walkerairsep.com/ Regards, Daris | ||
| NewbeeMC9 Rating: N/A |
I like both of these interesting products. An altenative that I saw on an executive 4905 conversion was a Rotella T Jug with a hole in the thin side for the tube to drip into. The jug was mounted on its side so that periodic draining just required a pan or catch bucket and removal of the cap. Another bus I was looking at for sale, the guy just hung a jugon the end where it could be easily removed and drained. He would sometimes pour it through a coffee filter back into the engine. He claimed it kept the back of his bus clean. Be sure not to make it airtight. I'm about to get mine painted so I'm concerned also. I'll do the jug until I can afford the fancy one. NewbeeMC9 | ||
| Al Newell (The_peregrine)
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Thanks Daris... I looked over their site and sent them a couple of questions. Al | ||
| Richard Bowyer (Drivingmisslazy)
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According to Geoff, our resident GM guru, this system was once offered by GM, but was taken off the market. As I recall, GM did not want this waste pumped back into the engine. Richard | ||
| darisb Rating: N/A |
You're welcome Al. If you would, let us know what the question were, and what the answers are. Thanks, Daris | ||
| Brian (Bigbusguy)
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You talking about two differt things . One is the crank case not the slober tubes. Keeping neg psi in the carnk case should keep oil leeks from leaking. And the crank case breather from blowing blow by on the ground. The other is the slober tubes that is not the crank case they sell a kit to catch that not put it back in the motor. On my motor I dont have blow by from the crank case breather and only a few seeping leaks that is nothing . But the slober tubes leak a little. So the slober tank is what I will buy or build. My motor dont seen to have the slober tube check valves to stop the air under high RPM fro blowing all the time. Brian 4905 Klamath Falls Oregon | ||
| TWODOGS (Twodogs)
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same thing brian | ||
| Brian (Bigbusguy)
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Bad dog. Not the same . Air box around the cyl are not connected to the crank case. They sell two differnt things one for each, You should read the website on the walker system. I realy dont think for use in a bus the walker sys is worth buying . I dont see any blow buy comming out the brether tube. But somthing to collect the slober tube goo is what most should have. Brain 4905 Klamath Falls oregon | ||
| TWODOGS (Twodogs)
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bigbusguy..please tell us where the slober tube is different than the breather tube,like on the older model chevys | ||
| jimmci9 #2 Rating: N/A |
hey 2d... just for reference, the "slobber tubes" are airbox drains.... the "crankcase breather" vents the valve covers and internal engine...(gear train, valve train, crankshaft, crankcase).... the "crankcase breather' allows piston-ring created blow-by to escape... | ||
| TWODOGS (Twodogs)
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I guess I'm not getting the correct information..I looked at the posted walker site & can't see the item..I saw tubes coming from valve cover & going into the walker system...I must be looking at the wrong item | ||
| Brian (Bigbusguy)
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This one is the air box crap catcher http://www.walkerairsep.com/product_detail.asp?id=565 This one is the crank case closed system http://www.walkerairsep.com/product_detail.asp?id=150 This one I feel is not needed in a bus . A boat yes. Brian 4905 Klamath Falls Oregon | ||
| TWODOGS (Twodogs)
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so....back to the original question...If Al has an engine that is putting out excessive amounts of blow-by...he should be able to see what he would be eliminateing by removeing the OIL FILL plug & look at the smoke coming out while the engine is running... And...if he is like MOST DD people..& wants to eliminate the puke tubes from spotting up the toad...he needs the horizontal catch can....( ? ) | ||
| Stan Rating: N/A |
Is there any way to draw a picture with your mouse? Let me have a try at explanation. There should be no oil coming from the windbox drains (slobber tubes) when the engine is working. The oil originates in the airbox at idle. Most oil on a tow car comes from all the various and sundry joints that leak around the engine because there is a positive pressure inside the engine pushing the oil out through the gasketted joints. If you reduce the crankcase pressure below atmosphere it will suck air in instead of pushing oil out. | ||
| TWODOGS (Twodogs)
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strange...most off the stuff on my toad came from the puke tubes,believe it to be diesel,the few spots it gets............. | ||
| Jon W. Rating: N/A |
I got real anal about a film getting on my toad from my 8V92. I extended the breather / slobber tubes, and eventually caught their discharge in coffee cans. Nothing worked until I found a fuel line fitting that was out of sight. A 1/8 turn tightened it and my toad never got stuff on it after that. Now if I got anything on the toad I would look at every fitting before I messed around with the breathers. On the latest coach (Series 60) I was getting a film on the inside of the engine compartment doors and on the cap. That turned out to be a power steering reservoir return line and an oil return fitting on the bottom of the alternator. Clean again. | ||
| Stan Rating: N/A |
Two Dogs: Jon is right that you may have a fuel leak or it is more likely to come from you tail pipe than from the airbox drains. If your engine doesn't have the pressure operated valves on the slobber tubes you should put them on. My understanding is that they were standard on some engines but not on others. I had to add them to both 8V71 engines that I had. They are a real tricky valve that looks like an inline check valve. If you blow gently in the end they are open but if you blow hard, they close. That is why the slobber tubes don't leak when the engine is working and airbox pressur is up. This information for the general use of the board. I don't expect you to believe it since you once said that I didn't know what I was talking about. | ||
| niles steckbauer (Niles500)
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Jon W. - I believe you said a mouthful - I think lots of people assume that the stuff they see on the toad, floor , engine box, etc. is oil - a lot of times this assumption is reinforced because of high oil usage in older DD's - but I would be willing to guess that a good portion is due to what you have pointed out - there are numerous fluids in various lines and reservoirs within the engine box that very likely are the source of the substance that seems "oily" all over their toad - Niles | ||
| Geoff (Geoff)
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When I bought my bus it had been "inframed" three times, and the end plate gaskets were leaking really bad and making a big mess. So I removed the engine, stripped to the bare block and completely overhauled it. No more leaks. Catch cans and crankcase suction systems are just a stop gap measure. --Geoff '82 RTS CA |
