eric28miller
HP lover
Hey guys, had terrible day.. I bought a rolled lbz duramax, was working on getting it running so I could pull it into the shop to start body work. Was running perfect, letting it warm up, been sitting a long time so I was easing into the throttle to clean things out when all of a sudden the rpm's sky rocketted to what sounded like 10k rpms. I quickly tried to shut it off which obviously did nothing. By the time I ran around and pulled the intake off to shove in my shirt it died on it's own so it only over revved for 12-15 seconds, although it felt like minutes. I right away knew oil must have ran into the intercooler while it sat upside down. I've had this happen with turbos going on on equipment once the oil got hot enough but I never would have guessed it would do it on cold oil, I was very wrong. :bang I let it cool down and bumped the starter a few times to access the damage, I figured the bottom end is fine because it never lost any oil and I didn't hear any rod knock but as it cranked it made a blop noise from the intake sounding like some valves not opening. I believe the valves floated and either bent some pushrods or could they have just fallen off the rockers? I've never been in a duramax engine and was hoping you guys could shed some light on this. It's got 170k miles so i'm going to go ahead and pull the heads off and do a head gasket job with some arp studs. I'm worried the valves kissed the pistons, what are your thoughts? Thanks