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What Creats Blow By & How can you Reduce it ???

71382 Views 3 Replies 4 Participants Last post by  ITowBoats
Hello everybody,

I have a friend who just bought a truck that has heavy blow by in it. He got it from the most famous auction site. When we remove the oil cap there is white smoke puffing out like a choo choo train... and when you remove the oil dipstick you can see white smoke coming out of that too..... the exhaust has some smoke when the truck is cold but that kind of goes away as it warms up. The truck does run excellent but the blow by is there.... What really causes blow by??? and is there any way to stop the blow by in this truck or reduce it???

The truck is:

1999 Ford F250 XL with 126K miles on it PowerStroke Automatic.

Thanks !
1 - 1 of 4 Posts
What causes blowby is worn rings allowing compression to enter the crankcase. To remedy it, you need a rebuild.

I would have a compression / cylinder pressure test done on it to see how close it is to spec, then decide.

Usually blowby will cause reduced performance, lower economy and more oil consumption, things your friend may or may not want to to live with at the prospect of a 5,000-10,000 dollar engine rebuild.
1 - 1 of 4 Posts
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