[F250Truckin]

A little history. Bought this truck in December. It started very well even below zero without plugging it in. Starts easy, runs strong, oil is clean as can be. While hooking up the CCV mod, found the line from the dog house to the air intake had been disconnected. Turns out that is where the oil in the valley was coming from. Once the CCV mod was in place, this truck has more blowby than any vehicle I have ever seen. It whistles like the exhaust on a cold early morning. It does not use oil, has plenty of power, starts easy and the oil stays clean.

Is there some way the turbo is blowing into the crankcase? What else should I look for? I consider fuel mileage to be poor - commonly 14. I am not a heavy pedal driver.

As always, your help is greatly appreciated.

 

[Oneof6]

What CCV Mod are you writing about? The cannister type adder mod, purpose built, home made or a hose run to the vehicle back? Your description seems like you have restricted it someway. about three or four years ago I tried the open vent CCV mod, didn't like the stench of oil and the blow by, thought I would get some leaks pretty fast so I changed mine back to stock.

14 MPG is not unusual for stop and go in town type traffic, that is about what I get. Out on the Interstate 18 to 20. Sometimes I just drive and forget that I am pushing 7500 lbs around like a sports car, maybe like me you are a little heavier on the foot than it seems.

 

[F250Truckin]

CCV mod is just vented behind the front wheel. Blows so hard it looks like I have a fan under the truck. No restrictions, I can see the complete hose standing beside the truck. I drive mostly on cruise control. I'm a country boy so don't do a lot of stop and go. We will be towing the 5th wheel with the boat behind it for the first time this year come Monday.

I would be more concerned if the oil wasn't so clean and the truck has so much power. Any more and I would not be able to keep the wheels on the ground. I just can't figure out what could be causing that much volume of blowby.

 

[rammertide07]

Cylinder wear can cause blowby or restriction on the hose from the ccv. That's all I know of.

Sent from my ADR6300 using AutoGuide App

 

[F350_6]

When you say blowby, are you referring to pressure or just smoke? Remove your oil cap and flip it upside down on the fill tube. If the pressure blows the cap off the tube, it's time for a compression test to see which cylinder(s) is bad. If the cap just vibrates off but it smokes like crazy, don't worry.

 

[BryceB]

When you say blowby, are you referring to pressure or just smoke? Remove your oil cap and flip it upside down on the fill tube. If the pressure blows the cap off the tube, it's time for a compression test to see which cylinder(s) is bad. If the cap just vibrates off but it smokes like crazy, don't worry.

Do you do this at idle or rev it up some?

 

[Bill1013]

At idle. Or rev it up to 3500 and see how hi it goes.

 

[F250Truckin]

I'm referring to the volume of air coming out of the CCV hose. I can and have flipped the fill cap and it doesn't do anything except vibrate and a little smoke. This thing acts like the turbo is somehow blowing through it. It blows the leaves on the ground around under the truck. I deliberately put a minor elevation in the hose before sending it down so that any fluids flow back into the engine or out onto the ground. I did not want any restriction to occur in cold weather with something freezing. Am I simply unaware of how this engine works?

 

[F350_6]

I'm referring to the volume of air coming out of the CCV hose. I can and have flipped the fill cap and it doesn't do anything except vibrate and a little smoke. This thing acts like the turbo is somehow blowing through it. It blows the leaves on the ground around under the truck. I deliberately put a minor elevation in the hose before sending it down so that any fluids flow back into the engine or out onto the ground. I did not want any restriction to occur in cold weather with something freezing. Am I simply unaware of how this engine works?

You should get the same volume of air out the CCV hose as the oil fill tube. The turbo isn't blowing any air out the hose. Is the volume of air you're referring to a steady stream or does it come out in puffs?

 

[F250Truckin]

It appears to be steady.

 

[bullittman281]

hello,
Everything sounds normal to me. compared to the volume of air moving though the engine the blow by is insignificant. If it fires easy and runs good, your fine. This brings up a second point though. Why not return the crank case vent to stock? you gain NOTHING by doing it. Its like modding just for the sake of modding. Your time would be better wasted keeping the tires properly inflated. That will actually bring benefits. I'm no greenie by any stretch but I think its TOTAL BS to be dumping blow by into the atmosphere. What comes out is the nastiest crap I've ever smelt/seen. It'd gag a maggot. If you hook it back up like its supposed to be you wont see the crank case venting and all will be bliss again.

Bullittman

 

[MNdieselpower]

hello,
Everything sounds normal to me. compared to the volume of air moving though the engine the blow by is insignificant. If it fires easy and runs good, your fine. This brings up a second point though. Why not return the crank case vent to stock? you gain NOTHING by doing it. Its like modding just for the sake of modding. Your time would be better wasted keeping the tires properly inflated. That will actually bring benefits. I'm no greenie by any stretch but I think its TOTAL BS to be dumping blow by into the atmosphere. What comes out is the nastiest crap I've ever smelt/seen. It'd gag a maggot. If you hook it back up like its supposed to be you wont see the crank case venting and all will be bliss again.

Bullittman

I would have to respectfully disagree. Blow by is normal and the truck is fine, I have quite a bit of blow by too. Is it the best thing for the atmosphere? no probably not but I have seen a lot of trucks that DO benefit from doing the ccv mod. Yes it stinks and is nasty, but I would much rather blow it out than have the stock set up that sucks it back into my intake. My engine bay has stayed completely clean since doing the mod. Also similar years cummins trucks come stock with it blowing out vrs putting it back into the intake. It vents just as much either way, and I myself like the fact that its not getting sucked back in to my engine area. If you dont like it exiting up front just run a longer tube further back. Some guys even vent directly into there exhaust pipe. There is also a way to put a filter and collection container on the end.

 

[bullittman281]

Hello,
What quantifies as doing better? The smoke cloud underneath the truck? If your boots are getting greasy they're toasted. Period. changing the crank vent wont change that. Sucking it back though the engine causes the engine no grief. A little oil film in the inlet boot doesn't hurt. I'm gonna call BS on this mod. My point is made.

Bullittman

 

[MNdieselpower]

By doing better it is simply the clean engine bay for me. My boots were all perfect and I was sick of washing the engine every month to keep it clean. I havent washed my engine bay in a year since doing the mod and it is still spotless. I have friends who had the same results after the mod. Obviously im not claiming there is any performance advantage or disadvantage other than the fact when the hood is popped at a car show its nice and clean. The white smoke doesnt bother me at all, it is routed to the middle of the truck at the back of the cab and it is rare to even see it unless you are under the truck. To each his own though

 

[F250Truckin]

I've been gone a few days and wanted to say thanks for the comments. I agree with the engine bay being clean. Mine isn't spotless and never will be, but it is pretty clean at that. I just thought there was a problem but it appears not and for that I am grateful.

Thanks everyone.

 

[rammertide07]

Note: if you add 2.5qrts of Marvel Mystery oil to your oil change, the ccv vapor has a minty smell:thumbsup:

The gain is a clean engine, dry IC boots, and not having to pull over on the side of the road to stick your hands in a hot engine compartment to re-secure a blown boot. Oily tubes makes them a dust/debris trap.. like a clogged artery. My quantified theory falls in line with MNdieselpower.

 

[MNdieselpower]

I'll have to try the marvel oil out! Btw back to the original question regarding the amount of pressure/"whistle noise" Coming out of your vent hose, what size hose/ what kind of material did you use? This could be the reason you are experiencing that. Also where do you have it routed to?

 

[POWER STROKE WEASEL]

u sprayed eather and cracked ur rings?
:nono:

 

[rammertide07]

u sprayed eather and cracked ur rings?
:nono:

Ok, I give. Where is someone talking about eather and cracked rings? I feel like I'm asking a sells clerk where an item is on a shelf and it ends up being right in front of me

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[MNdieselpower]

Eather and cracked rings? Haha sorry but if the truck runs fine blowby is totally normal, all diesel engines have it due to how much compression they make. You will know if you burn up a ring