Crank Case Filter Bad?
Fleet Mechanic
Joined: Aug 2006
Posts: 1,465
Likes: 17
From: Jacksonville, FL
As far as then what've pressure thing I don't think I would be too concerned. All the diesel generators I have taken care of in my time vent to the atmosphere. No filter, just a hose coming straight off the crank case. This is from the small 175kW up to the larger 2.5MW (32 cylinder) units. The key is just to make sure the hose can't get sealed off for any reason (kinks, plugging, tube collapse, etc.). This would cause a positive pressure to be created, which in turn, at the very least would cause oil to start oozing from places it shouldn't.
The environmental issues aside I don't really see much difference either way, if you want to keep oil out of your intake system then it should be a perfectly feasible way to go. Myself, I have breathed enough crank case fumes to last me a while and don't really want to even get a whiff of them from my truck, so mine will stay as is from the factory.
Just my $.02 to add to the discussion.
The environmental issues aside I don't really see much difference either way, if you want to keep oil out of your intake system then it should be a perfectly feasible way to go. Myself, I have breathed enough crank case fumes to last me a while and don't really want to even get a whiff of them from my truck, so mine will stay as is from the factory.
Just my $.02 to add to the discussion.
Senior User
Joined: May 2016
Posts: 321
Likes: 0
I am also ordering a oil cap that also vents the engine . It has a small check valve inside with a filter on top . Really neat design.
Hotshot
Joined: Mar 2014
Posts: 10,750
Likes: 1,065
From: Douglassville, PA
I think that there is too much thought going into this. Rickster is right on the money. My old Cummins motor on my heavy truck just had a fitting protruding out the top of a valve cover with a "U" pipe attached to it for a vent. That had about a 3/4" hose that went straight down below the engine. The picky guys lengthened that hose so it barely cleared the highway to minimize the oil that built up on the underside of their shiny trucks. It misted the tranny and the rears. If I was to perform that mod I'd just route a hose right off of that doghouse, clear of exhaust parts, to the ground. They do give off a smell like he said and the older the engine (more blow by) the more it smells. As for a vented oil fill cap, that will probably vent you a nice mist, vapors and odor up under your hood.
Hotshot
Joined: Jan 2011
Posts: 18,849
Likes: 179
From: Puget Sound
To follow up on the tear-down debate - I agree I haven't yet done a tear-down. However... every orifice on the engine or the support systems has been invaded by an inspection camera.
The intercooler is aluminum.
The intercooler is aluminum.
Hotshot
Joined: Jan 2011
Posts: 18,849
Likes: 179
From: Puget Sound
As our friend Osmond4X4 has pointed out - it's a personal preference. If the only argument for doing the mod is because one doesn't like the way the oil looks in the intake - then I say I'd stop looking in there. I don't like how the toilet looks after I sit atop it, but I'm not going to vent it to air.
Junior User
Joined: Jun 2016
Posts: 86
Likes: 0
That is very valuable information. I think about what the heavy equipment is intended for, and I compare that with how I drive to work, near home, and in the big city. One thing sticks out in my my mind - I once needed a tweak to my idle tuning and it was stinking everybody out in heavy traffic. When I have the VCs off and the engine running, I'm grateful I don't have to smell that all the time.
As our friend Osmond4X4 has pointed out - it's a personal preference. If the only argument for doing the mod is because one doesn't like the way the oil looks in the intake - then I say I'd stop looking in there. I don't like how the toilet looks after I sit atop it, but I'm not going to vent it to air.
As our friend Osmond4X4 has pointed out - it's a personal preference. If the only argument for doing the mod is because one doesn't like the way the oil looks in the intake - then I say I'd stop looking in there. I don't like how the toilet looks after I sit atop it, but I'm not going to vent it to air.
We do things a lil different out here in the sticks
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Senior User
Joined: May 2010
Posts: 396
Likes: 3
From: Los Angeles, CA
I used the riffraff vent to atmosphere kit for a while and hated it. You could see the blow-by coming out in some circumstances and smell it more often. It got too much attention during a smog test once, but he couldn't find where it was routed and I passed that time. (Nothing wrong with the riffraff kit, if you want to vent to atmosphere, but doing that isn't a great solution)
I pulled it off and went to a proper closed loop separator that routes the separated oil into a catch can that I can drain at intervals:
https://www.ford-trucks.com/forums/1...l#post15396386
I pulled it off and went to a proper closed loop separator that routes the separated oil into a catch can that I can drain at intervals:
https://www.ford-trucks.com/forums/1...l#post15396386
Laughing Gas
Joined: Aug 2014
Posts: 1,020
Likes: 9
From: Washington State
[QUOTE=Tugly;16351882]To follow up on the tear-down debate - I agree I haven't yet done a tear-down. However... every orifice on the engine or the support systems has been invaded by an inspection camera.
The guy that does my Colonoscopy would call that a Tear-Down.....
The guy that does my Colonoscopy would call that a Tear-Down.....
Lead Driver
Joined: Jun 2013
Posts: 5,647
Likes: 891
From: north of Minneapolis, MN
Nope, as Pocket stated, It's doing what it's supposed to, Reburning the Blowby.....Some folks are slightly retentive and can't stand the thought of messing up their shiny new turbo wheel and bypass it. Oh, and that part is commonly referred to as the "Doghouse" Carry on......
