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that4wdwagon
PostPosted: Sun Dec 13, 2015 12:52 pm 
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So I've started working on the old 225 again. Back when I was first working on it, cylinder 3 had bad compression(50 psi) as compared to 80-90 psi on the other cylinders. And the spark plug on that cylinder was smashed up really bad. It also smoked really bad! So I pulled the head off today and that same #3 cylinder was completely steam cleaned and shiny, it made me think the head gasket was bad and leaking coolant in that cylinder but the gasket didn't have the tell-tale signs of a blown head gasket though. I couldn't see any visible cracks on the head either, but I'm gonna take it to the machine shop tomorrow and see if they can tell me anything. The piston had a rough feeling, reminded me of that hammered spray paint you buy, the other pistons were smooth, and that cylinder wall was a little scarred up as well...

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My question is, what else could've caused this? Anything I might have over looked or not thought about?
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Valleyant
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PostPosted: Sun Dec 13, 2015 3:05 pm 
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Maybe a crack between the valves into the cooling water jacket causing coolant to leak into that cylinder.......
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wjajr
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PostPosted: Sun Dec 13, 2015 4:07 pm 
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Cracked head most likely. Crack can be between valve seat and intake gasket, or somewhere on roof of combustion chamber in head.

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that4wdwagon
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PostPosted: Sun Dec 13, 2015 5:58 pm 
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Thats what I was afraid of.... :( Thanks for the fast response yall!!
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bcschief
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PostPosted: Wed Dec 16, 2015 4:27 am 
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Also inspect the cylinder bore for signs of a crack it may look darkend and pitted around the crack

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Dart270
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PostPosted: Thu Dec 17, 2015 8:17 am 
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It could also be a blown head gasket into the water jacket, but less likely. Fingers crossed...

Lou

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bcschief
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PostPosted: Mon Dec 21, 2015 2:52 pm 
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What did they find ?

Brian

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slantzilla
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PostPosted: Mon Dec 21, 2015 3:37 pm 
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If the plug was smashed, cylinder scarred, and piston top beat up something went through it. If you can feel dings in the cylinder with your fingernail the cylinder needs bored. I would guess that with 80-90 psi compression that motor is in need of boring anyway.

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