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  #1  
Old 04-15-2008, 02:27 PM
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Unhappy What does this mean???

I was told that the smokey fog comming out of my oil cap is "blow by" and I seem to have alot of it. I was also told that the same stuff constantly comming out of my CCV mod tube is also "blow by". So which is it??

Now, my truck does have 215k miles on it, but it just seems to me like this foggy smoke stuff, comming out of either one.. this excessivly, isn't a very good sign of a well running/clean engine..... am I wrong? What is it that is causing this and what can I do about it???
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Old 04-15-2008, 02:34 PM
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i believe the 7.3's smoke like that all the time. if its pouring out then its probably worn out, but mine also smokes out the oil fill and it only has 87k on it.
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Old 04-17-2008, 04:41 AM
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come on, somebody should have a clue????
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Old 04-17-2008, 05:01 AM
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diesels have some blowby it is completly normal unless it is excessive.
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Old 04-17-2008, 07:09 AM
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It's excessive allright! My wife dosen't know jack about anything mechanical and she noticed it easily! It's pretty damn heavy.
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Old 04-17-2008, 07:25 AM
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All engines Gas or Diesels have "Blowby"

Blowby in simple terms is when gases (exhaust or unburnt fuel) pass by the piston rings and into the crank case.

The reason all engines have some form of it is because piston rings will not seal 100% from the cylinder to the crank case, therefor a little gas gets by, this can be seen like you said coming up the oil filler pipe or the CCV, remember CCV stands for Crank Case Vent so any gases in the crank case are going to get vented like they are designed to. All crank cases have to be vented.

Now, how excessive is this? You say pouring out, but try and give a little better description.

Long story short excessive blowby is an indication of worn rings, and of course it doesn't get better over time. The real way to figure out if you have an issue is to run a compression check to see if you are within specs, if you are don't worry about it, if not plan on a rebuild in the future.

Sorry for the bad new but that's the reality of it.

Last edited by Doakster; 04-17-2008 at 08:15 AM.
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Old 04-17-2008, 07:27 AM
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Until you do a compression test, it's a guessing game.
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Old 04-17-2008, 08:12 AM
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Quote:
Originally Posted by Dirk View Post
Until you do a compression test, it's a guessing game.
X2 Compression test first!
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Old 04-17-2008, 09:23 AM
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I'm in the works right now. So how do I do the compression test??? I think I know the basics but I need a step by step explanation of how to do and use my "Compression Gauge".
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Old 04-17-2008, 09:31 AM
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Pull the covered lead wire from the solenoid on the pass. fender. Use a jumper wire from the + side batt to this pole to crank the motor.

To start:

Pull all the glow plugs (remove any oil around the gp, I always crank it over a few times to remove any that might drain in)

Screw in the powerstroke adapter into the glow plug hole and attach your gauge.

Crank the motor over. If your gauge doesn't hold the highest reading, have someone use the jumper wire while you watch the gauge.

I don't remember the leakdown part off the top of my head.

Repeat.

There is another active thread on here that Djdiesel posted the ford procedures (I think it also has the leak down info also). I think you already posted on here.
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