nick.cfrancis Posted April 5, 2012 Share Posted April 5, 2012 The valve head probably broke off because there is valve to piston interference when the valve timing was off, because the timing belt broke. The head and the piston are shot, probably also the cylinder walls. -HMK Link to comment Share on other sites More sharing options...
kosnic Posted April 5, 2012 Author Share Posted April 5, 2012 The valve head probably broke off because there is valve to piston interference when the valve timing was off, because the timing belt broke. The head and the piston are shot, probably also the cylinder walls. -HMK The original timing belt didn't break and was in good shape when I took it off. It was out of time though, or I believe it was. I couldn't rotate the engine all the way around, it would bind up. I keep thinking that I could throw some plugs in it and re time it and see what happens, but I know it would be a HUGE waste of time. Whatever destroyed the spark plug had to of done damage to other parts, theres no way that it didn't. Link to comment Share on other sites More sharing options...
johnegg Posted April 5, 2012 Share Posted April 5, 2012 I pulled this from an 04' Honda Accord V6. was the engine toast? Link to comment Share on other sites More sharing options...
johnegg Posted April 5, 2012 Share Posted April 5, 2012 Once I get it out I'll check out the 2.5 and see what happened. it's too bad there isn't a test you could do before you pull it , just to be sure. you know, like a COMPRESSION TEST. Link to comment Share on other sites More sharing options...
GTTuner Posted April 5, 2012 Share Posted April 5, 2012 was the engine toast? No, someone forgot to tighten the plug, the coil kept it in the hole but it unthreaded itself. The combustion melted the plug and coil. We heli-coil'd the hole, put a plug and coil in and sent it on its way. Link to comment Share on other sites More sharing options...
babybaluga32 Posted April 5, 2012 Share Posted April 5, 2012 Im annoyed I deleted all the original pics, but the plug I pulled out of the engine below looked similar. On a SOHC 2.5 http://legacygt.com/forums/showthread.php/piston-death-172399.html?t=172399 Link to comment Share on other sites More sharing options...
nick.cfrancis Posted April 5, 2012 Share Posted April 5, 2012 The original timing belt didn't break and was in good shape when I took it off. It was out of time though, or I believe it was. I couldn't rotate the engine all the way around, it would bind up. I keep thinking that I could throw some plugs in it and re time it and see what happens, but I know it would be a HUGE waste of time. Whatever destroyed the spark plug had to of done damage to other parts, theres no way that it didn't. If the timing belt was off time, there would still be valve-piston interference, causing the valve head to break off. I have had this happen before. When the head of the valve breaks off it destroys the cylinder wall,the head [combustion chamber] and the piston. The piston will have a hole in it and the metal will go through the whole botom end. -HMK Link to comment Share on other sites More sharing options...
kosnic Posted April 5, 2012 Author Share Posted April 5, 2012 it's too bad there isn't a test you could do before you pull it , just to be sure. you know, like a COMPRESSION TEST. LOL, Why bother? I know the thing is going to have bent valves anyway.. I went into this project expecting problems. My plan was to get a new timing belt on and get it started and see what was going on. I always assumed I would need new heads or an engine. I don't have a compression tester anymore and I don't really need one now. This thing has problems regardless of the compression test. I'll just cut out all the bs and replace the engine. I'll have to any way. Link to comment Share on other sites More sharing options...
TbirdMan Posted April 6, 2012 Share Posted April 6, 2012 If the timing belt was off time, there would still be valve-piston interference, causing the valve head to break off. I have had this happen before. When the head of the valve breaks off it destroys the cylinder wall,the head [combustion chamber] and the piston. The piston will have a hole in it and the metal will go through the whole botom end. -HMK yes, this is exactly the scenario I was talking about in my post, that is what a plug looks like after it has been pummeled by the head of a valve rattling around the combustion chamber. it is not 100% certain, but that was my first thought as well. Link to comment Share on other sites More sharing options...
SpecBamf41 Posted April 6, 2012 Share Posted April 6, 2012 i cant beleive the dropped valve was not the first guess. just a few weeks ago someone posted the pics of the top on a cylinder and the head to go with it after a valve dropped. the whole piston face and head looked just like this spark plug. the entire half of that motor is toast.(entire block to cause you cant mix block halves BNR18g on 93oct Link to comment Share on other sites More sharing options...
kosnic Posted April 11, 2012 Author Share Posted April 11, 2012 i cant beleive the dropped valve was not the first guess. just a few weeks ago someone posted the pics of the top on a cylinder and the head to go with it after a valve dropped. the whole piston face and head looked just like this spark plug. the entire half of that motor is toast.(entire block to cause you cant mix block halves That's what happened with this one. The head of the valve broke off. Link to comment Share on other sites More sharing options...
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