What Is Blow By In A Car Engine

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What Is blow-by in an engine?
Hint, It’s not good. Engine blow-by occurs when piston rings are worn or pistons are damaged and the combustion gas is blowing by and out the valve breather.
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Thank you sir. I had no idea what blow by was so thank you

ZalienZemei
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How long can an engine thats experiencing blow by last? Got a plow truck (same generation GMT400) thats got blow by starting on its 4.3. Hoping to get another winter out of it before scraping.

OutsideLiving
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It it happens but engine still runs smoothly and normal..does it still needs to be replaced?

siphoernest
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Now can you repair it if the piston has burned or engine would need a whole rebuild?

Blackut
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OMG! 😳 WHELP! 😬 THERE IS A NEW ANXIETY THAT HAS BEEN UNLOCKED! 😅

John.Skelton