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Unread 04-05-2002, 07:25 AM   #1
mopar_man
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Location: Prairies of Saskatchewan, Canada
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Blow-by? Can someone educate the uneducated?

I had a post about what to look for when buying a Jeep. Someone said to check for blow-by and didn't elaborate on what this is. Can someone tell me? I think I'm going to look at one this weekend so any and all quick responses would be appreciated.

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Unread 04-05-2002, 08:50 AM   #2
4wheeler4CJ
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A simple indication of "blow-by" is oil leaking out at the PCV Valve, or, even worse, is oil leaking out at the gaskets (valve cover, fuel pump if older motor, LOL, Rear Main, Head, etc.)

Blow By is the compression in the cylinder leaking back past weak rings, causing positive pressure in the crankcase, ultimately causing oil to push out of any available openings, and, when worse, it makes it's own openings to come out.

The real method to check blowby is by doing a compression test. If you check the threads on here, it is explained more in detail. Do a search for "blow by", and you should pull up a few posts we have had. <img border="0" title="" alt="[Wink]" src="wink.gif" />
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Unread 04-05-2002, 08:50 AM   #3
4wheeler4CJ
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A simple indication of "blow-by" is oil leaking out at the PCV Valve, or, even worse, is oil leaking out at the gaskets (valve cover, fuel pump if older motor, LOL, Rear Main, Head, etc.)

Blow By is the compression in the cylinder leaking back past weak rings, causing positive pressure in the crankcase, ultimately causing oil to push out of any available openings, and, when worse, it makes it's own openings to come out.

The real method to check blowby is by doing a compression test. If you check the threads on here, it is explained more in detail. Do a search for "blow by", and you should pull up a few posts we have had. <img border="0" title="" alt="[Wink]" src="wink.gif" />
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Unread 04-05-2002, 09:43 AM   #4
mopar_man
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Ah. Very good Thank you. I've only ever bought 3 vehicles, one which I was replacing the engine on already and the other 2 didn't leak anything so I was lucky on those.
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