ivantruckman Posted February 6, 2017 Share Posted February 6, 2017 I don't suppose these are permissible hairline cracks . Quote Link to comment Share on other sites More sharing options...
ferp420 Posted February 6, 2017 Share Posted February 6, 2017 (edited) I would run it all aluminum heads crack as long as it isent cracked in to a water port or goes past the valve seat into the port on the other side of the valve seat I would say it's fine the exhaust side looks more like a casting flaw then a crack I would smooth everything out in there while its apart but that's just me On a second look is the valve seat cracked too if so its new head time or a machine shop could possibly fix it Edited February 6, 2017 by ferp420 Quote Link to comment Share on other sites More sharing options...
ivantruckman Posted February 6, 2017 Author Share Posted February 6, 2017 This attached pic highlighted spot appears to show the valve seat cracked as well. I will still disassemble it and check further . This 1991 loyale ea82 spfi engine was cruising at 55 mph and started shooting out steam coolant and oil . no water in the oil pan . immediately shut down. no overheat . I suspect the head is cracked to the coolant passage . Quote Link to comment Share on other sites More sharing options...
skishop69 Posted February 6, 2017 Share Posted February 6, 2017 It is toast. It looks like it cracked all the way through. I don't remember ever seeing a crack in the exhaust port. That is no bueno. Quote Link to comment Share on other sites More sharing options...
idosubaru Posted February 6, 2017 Share Posted February 6, 2017 Done. The head side cracks are normal The exhaust side is not. And you've got all the symptoms to prove it. Quote Link to comment Share on other sites More sharing options...
ferp420 Posted February 6, 2017 Share Posted February 6, 2017 I have no idea how the hardened steal valve seat could crack but it definitely looks cracked I would think the valve would give up first good luck with this Quote Link to comment Share on other sites More sharing options...
Naked Buell Posted February 7, 2017 Share Posted February 7, 2017 I had one do the same thing. Opened it up and behind the valve was a hole I could stick my thumb through. Of course it was a ea82T but didn't have any luck with the heads once you see the crack. I had a machine shop weld and reground but it happened again later down the road. I upgraded to a better engine. Quote Link to comment Share on other sites More sharing options...
rpholz Posted February 8, 2017 Share Posted February 8, 2017 He's dead, Jim 2 Quote Link to comment Share on other sites More sharing options...
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