Matt Saunoras Posted July 1, 2011 Share Posted July 1, 2011 This one came in on the hook Monday. F-550 cab n chassis misfiring like crazy on 1,2,3 and sometimes 4. Scanned dtcs and right away it hit me, #3 glowplug circuit code. 3 was the most dead of all of them, it never once fired relative showed it down 22%, when I pulled the glow plugs out I found this That's never good. Manual compression test showed nothing for #3 and #1 was down 1/3rd from the rest. left bank was fine. So I'd heard about exhaust valves cracking but I never expected to find this You can see severe metal transfer on #1 and slightly on #2. Exhaust valves are cracked all over the place so I pull the left head off. Every single cylinder in this engine has atleast one cracked exhaust valve, many have both cracked. Got prior approval for a long block. Also the primary water pump was leaking on this one and it does have a EGR stuck open code in it. Quote Link to comment Share on other sites More sharing options...
Brad Clayton Posted July 1, 2011 Share Posted July 1, 2011 Uh, and all this time I was worried about the valve seats...pfft. Quote Link to comment Share on other sites More sharing options...
Steve Mutter Posted July 1, 2011 Share Posted July 1, 2011 I have had a 6.7 with that egr code too. I forget the code but a egr valve fixed it. Quote Link to comment Share on other sites More sharing options...
Fordracer Posted July 1, 2011 Share Posted July 1, 2011 How did you get approval for a long block? They made me put an engine together with a short block and two heads. They even tried to get me to put valves in the head that wasn't damaged but the machine shop said the head was pitted and needed resurfaced so they let me replace both heads. Quote Link to comment Share on other sites More sharing options...
DieselD Posted July 1, 2011 Share Posted July 1, 2011 whats the build date on this truck? early? Quote Link to comment Share on other sites More sharing options...
Matt Saunoras Posted July 4, 2011 Author Share Posted July 4, 2011 early. may, 2010 hotline suggested I submit prior approval for a long block. I did and they didn't have any problems. This truck did have a leaking primary water pump and I mentioned that it would need addressed too Quote Link to comment Share on other sites More sharing options...
cheezit Posted July 4, 2011 Share Posted July 4, 2011 just got done with the same failer. broken #3 glowplug. metal transfer to both sides. replaced long block, #3 glowplug and injector. Quote Link to comment Share on other sites More sharing options...
cheezit Posted July 14, 2011 Share Posted July 14, 2011 had an fse in my stall to day and we were talking about this. per him the current rumor on the cause is thermocycling from the amount of egr flow used in the 450/550 causing the valve to crack and break. Quote Link to comment Share on other sites More sharing options...
Matt Saunoras Posted July 14, 2011 Author Share Posted July 14, 2011 I might have read it here or on FMC, something about a step skipped in the valve making process? either way glad that damn thing is out of my stall Quote Link to comment Share on other sites More sharing options...
Brad Clayton Posted July 14, 2011 Share Posted July 14, 2011 As sure as the sun will rise and set, there will be another one to fill your bay. Quote Link to comment Share on other sites More sharing options...
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