Blow-By Question
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Blow-By Question
Just found your website - it is great.
I have a 2000 F250 PWD with about 100K miles on it.
With the engine running, if I remove the valve cover vent tube that plugs into the turbo inlet I notice a large amount of air coming out with a some oil mist as well.
The amount of air venting is similiar to putting your hand in front of your face and exhaling somewhat forcefully and steady.
I am worried that this blow-by is excessive.
Does anybody else's diesel do this at idle???
Thanks,
Robert
I have a 2000 F250 PWD with about 100K miles on it.
With the engine running, if I remove the valve cover vent tube that plugs into the turbo inlet I notice a large amount of air coming out with a some oil mist as well.
The amount of air venting is similiar to putting your hand in front of your face and exhaling somewhat forcefully and steady.
I am worried that this blow-by is excessive.
Does anybody else's diesel do this at idle???
Thanks,
Robert
Posting Guru
Joined: Sep 2002
Posts: 1,897
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From: Northeastern Pa - USA
Welcome to the forum. I wouldnt get too excited about the blow by you are seeing (unless it is LOTS ). The diesel engines do seem to produce quite a bit of blow by when idling but when they are being used to make power, the rings seem to seal up and the blow by lessens. That is the reason for the tube to the turbo intake ... burn the gasses up. There are some type of kits that can be added to the engine compartment to do away with the tube going to the turbo. You would have to do a search in this forum for it. Perhaps cookie or one of the gurus can get in here and steer you. Enjoy your scooter.
Senior User
Joined: Apr 2004
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From: Clifton, Texas
I have seen several photos of trucks that have bypassed this by just turning the vent 180 and installing a 90 elbow and some rubber hose. I think they just vent it straight out to the atmosphere. Not sure how messy this gets around the end of the hose or in the driveway at home when the truck is sitting there just warming up. Can anyone that has done this shed a little info? Sure would like to keep that oil out of the intercooler tubes if I can but don't want oil dripping on the drive....
Fleet Mechanic
Joined: Aug 2003
Posts: 1,771
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From: Phoenix, AZ
To prevent the oil, etc. from dripping on the driveway, I stuck an old style gasser type CV filter, Purolator #B20009 on the end of the 3/4" hose. It collects and holds the oil, so far anyway.
Postmaster
Joined: Jan 2004
Posts: 4,758
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From: colorado
mine vents out near the spare under the truck. i ran the house up and over the master cylinder so any oil residue that does not collect in the housing on the valve cover will have a tuff time getting up and over . i have had it for about a month and not even a single spot of oil in my garage.
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RE: Blow by
Thanks for the great response - many compadres out there...!
I looked at 3 PSD trucks yesterday, all with similiar mileage, 80 to 120k miles.
When idling hot, I removed the oil filler cap.
Most had a some minor blowby, about what I would expect.
However, mine really puffs like a freight train. Others suspect that I may have a cylinder with bad or even broken rings.....
Wish I could do a bottom end without having to pull the motor......
Thanks!!
I looked at 3 PSD trucks yesterday, all with similiar mileage, 80 to 120k miles.
When idling hot, I removed the oil filler cap.
Most had a some minor blowby, about what I would expect.
However, mine really puffs like a freight train. Others suspect that I may have a cylinder with bad or even broken rings.....
Wish I could do a bottom end without having to pull the motor......
Thanks!!
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