Blow by - Ford Powerstroke Diesel Forum
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Old 07-15-2010, 01:01 PM
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Blow by

Took my truck in for an oil change last night and the mech said he wanted to do a blow by test, I only have 25,000 miles on it, he took the oil seperator cap off and it looked like BP oil pipe. He went and got his gauge and it read 27 supposed to read max 10., so in a few weeks after my vacation it is going in probably for a new short block. He feels it is from regening to much and washing down the cylinders, this really sucks but at least it will or should be covered under warranty. By the way the truck runs great and has lots of power.
Well my truck is now at the shop torn apart and all the cross hatch is gone in the cylinders and also has a nice ridge. So new short block is going in, should be all done next week.

Last edited by canuk; 08-19-2010 at 05:30 PM. Reason: Update
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Old 07-15-2010, 01:19 PM
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sucks to hear man. delete that DPF pos asap.
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Old 07-15-2010, 02:59 PM
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My truck makes lots of Blow by too. I have checked several friends trucks, and they seem to make excessive Blow by as well. It is strange, but these 6.4's seem to smoke quite a bit out of the oil fill. I know I have been saying it, but I will make a video of the amount my truck makes, and post it so we all have something to compare it too. I'm not saying your truck isn't messed up, just that mine smokes a lot as well. One thought, is that the 6.0's have a breather
on the passenger side VC, so they smoke less out of the Oil fill because most of the Blow by is entering the turbo from the passenger side PCV. Where the 6.4's have the oil separator, PCV, and oil fill all in one, so all the crankcase pressure and gasses escape through only one spot, making it seem excessive. Just a thought.

Last edited by dieselkane; 07-15-2010 at 03:06 PM. Reason: Added more info
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Old 07-15-2010, 03:30 PM
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If you crack a piston, it also creates excessive blow by.
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Old 07-15-2010, 07:11 PM
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That sounds like a bunch of BS to me. You only have 27000 miles and you have excessive blowby??? Something doesnt sound right.
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Old 07-15-2010, 07:58 PM
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Quote:
Originally Posted by skullsniper View Post
That sounds like a bunch of BS to me. You only have 27000 miles and you have excessive blowby??? Something doesnt sound right.
I agree...something is not right with that diagnosis.

Get a second opinion.
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Old 07-15-2010, 10:45 PM
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Umm, hate to sound like a newb but WTF is blowby?
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Old 07-16-2010, 03:39 AM
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Blowby is combustion gasses blowing by the rings into the crankcase. If you take off your oil fill cap with the engine running, you will see blowby in the form of smoke coming out of the oil fill. Some blowby is normal, but it can be excessive, indicating problems.
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Old 07-16-2010, 06:15 AM
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Ohhh, gotcha, never heard of it until now. Thank you.
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Old 07-16-2010, 08:31 AM
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Quote:
Originally Posted by tjbrowder View Post
I agree...something is not right with that diagnosis.

Get a second opinion.
This mech is one of the best you will find, the reason he looked at mine was he just had one like this and Ford denied warranty for not enough oil changes and he did them every 10K. He says it is from to much regen and it washes down the cylinder walls, you could smell deisel in my oil
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