ccv problem
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Freshman User
Joined: Dec 2010
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ccv problem
I am having one those vortex situations. I had a intercooler hose leaking oil. I got some info about installing the ccv tube. It worked well, but my wife pulled her horse trailer, about 6K lbs. There was oil all over the underside of the truck. I cleaned it out and it does not leak now (no load) I am thinking it came from the rear main seal, under load. I understand that the ccv hooked up to the intake creates a negative pressure on the crankcase. Anyone else experience this?
Hotshot
Joined: Oct 2003
Posts: 17,791
Likes: 99
From: Ashland City, TN
The CCV hooked into the intake is supposed to create a vacuum, but it does a poor job.
Venting to atmo under the truck shouldn't produce any oil unless you just ran the hose strait down from the doghouse.
Make sure you run the hose up and over the break booster so oil cannot get down the tube. And make sure its 3/4 inch hose otherwise you'll create back pressure in the system. I did that by oopsies using 3/8's line which I figured would be enough. Didn't realize how much that thing breaths.
Hope this helps. =)
Venting to atmo under the truck shouldn't produce any oil unless you just ran the hose strait down from the doghouse.
Make sure you run the hose up and over the break booster so oil cannot get down the tube. And make sure its 3/4 inch hose otherwise you'll create back pressure in the system. I did that by oopsies using 3/8's line which I figured would be enough. Didn't realize how much that thing breaths.
Hope this helps. =)
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I understand what you are saying. I ran the hose up and then down through the round coils in the brake lines running down the front of the firewall, but the hose is hanging down next to the front drive shaft and IS pointing kind of forward and that could put a positive pressure on the crankcase and cause a rear main to leak at high speed! She was hitting at least 60 mph.I will reposition the hose and drive it again!
FOREIGN GURU
Joined: Jul 2006
Posts: 7,655
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From: Celaya, Gto. MX
I am having one those vortex situations. I had a intercooler hose leaking oil. I got some info about installing the ccv tube. It worked well, but my wife pulled her horse trailer, about 6K lbs. There was oil all over the underside of the truck. I cleaned it out and it does not leak now (no load) I am thinking it came from the rear main seal, under load. I understand that the ccv hooked up to the intake creates a negative pressure on the crankcase. Anyone else experience this?
Hotshot
Joined: Oct 2003
Posts: 17,791
Likes: 99
From: Ashland City, TN
DC's would be higher which if there was an HPOP leak, it could be that.
Your theory on the tube for the CCV isn't off, size or not, you could create positive pressure if the hose was positioned just right at just the right angle to the attack of the wind, but that is highly doubtfull.
The other big oil killer is the EBPV actuator arm.
Your theory on the tube for the CCV isn't off, size or not, you could create positive pressure if the hose was positioned just right at just the right angle to the attack of the wind, but that is highly doubtfull.
The other big oil killer is the EBPV actuator arm.
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I have cleaned the valley, and in the bell housing and can not see any more leak after I re-positioned the tube. If I did not say this before, it all started after I took the tube off the turbo intake and added the tube. I have to make a 100 mile run tomorrow, I will post the results.
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Joined: Oct 2004
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From: Olympia, WA
Many folks run their CCV hoses straight down from the doghouse with little to no oily mess dripping on the truck belly or driveway. The end of my hose is oily from vapor, but it does not drip. I'd do as Farm suggested and check those o-rings for the doghouse. While the doghouse is off I'd rinse it out with solvent. The steel wool in the doghouse might be totally soaked with oil and maybe that is blowing down the hose. Clean it out and then maybe rig up a temporary catch can to see if you are really getting a lot of oil out the CCV hose and go from there.
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The oil is NOTcoming out of the ccv hose, just vapor. I cleaned the valley and inside the bellhousing. I can not get it to leak now, but it dumped 2 qts of oil from somewhere when my wife pulled her horse trailer 30 miles. I replaced the fuel pump lines to the back of the heads last year because the idiot mechanic at the dealership that installed the engine could not tighten down the fuel pump properly and it broke one of the lines. I had to pull the turbo to do this, but I don't see any leaks there. One question. On a gas engine, there is a ccv and a pcv valve to lower the crankcase pressure, it there a pcv valve on the 7.3? At idle there is a good amount of vapor coming out and actual pressure. The engine has 30K on it and uses no oil.
Hotshot
Joined: Oct 2003
Posts: 17,791
Likes: 99
From: Ashland City, TN
no PCV.
the pressure coming back is blowby past the rings which is a normal thing for diesels.
High compression and violent reactions in the chamber cause it.
If you lost oil I bet you lost it from the Hpop check valve or the EBPV.
the pressure coming back is blowby past the rings which is a normal thing for diesels.
High compression and violent reactions in the chamber cause it.
If you lost oil I bet you lost it from the Hpop check valve or the EBPV.
Hotshot
Joined: Oct 2003
Posts: 17,791
Likes: 99
From: Ashland City, TN
no PCV.
the pressure coming back is blowby past the rings which is a normal thing for diesels.
High compression and violent reactions in the chamber cause it.
If you lost oil I bet you lost it from the Hpop check valve or the EBPV.
the pressure coming back is blowby past the rings which is a normal thing for diesels.
High compression and violent reactions in the chamber cause it.
If you lost oil I bet you lost it from the Hpop check valve or the EBPV.