Originally Posted by Superduty
So an injector was leaking ? Metal fatigue ?
Or is this a symptom of the valve issue ? A hole in the piston doesn't explain pushrod damage unless a piece of the piston got between the piston crown and a valve, but you didn't show us any damaged valves either.
I understand your interest in getting it back together and getting it sold. However, just a little bit more information would help all of us learn from your situation.
Maybe its just me, but I've found the last part of your thread a bit hard to follow. There is still a missing link in this story.
List of steps......
Truck misfired in 1 second from running perfectly up a hill..
code reader read misfire 2..
found out pushrod #2 was badly bent and #5 was slightly bent..
compression #2 had 0...
took off head to find bad piston with cracks and hole... Star patterns perfect and same on all.. Never had issues before truck broke down. Pics posted of head before cleaned and after. Head shows no signs of damage and passed DIY leak down test. As of now, I see no more damage, assembly time.
Honed #2 best I could, did other lightly. Piston rings came off #2 were new looking still, but got replaced with new. Sanded down bottom of head and valves and wirebrushed around seats. then did DIY leak test all appeared same. No metal shavings at all in oilpan. oa came back 5000 miles prior to breakdown perfect. Also sanded down piston tops and blow, new gasket although original gasket still looked new.
Ive might of messed up the adjustment on 2 before I was taking it apart. Cant remember others. I think 5 exhast was to tight, 6 loose. hit or miss, wasnt keeping track as I didnt think that was causing the problem and something else was ultimatly wrong. Did a hand job valve job and she started up. Put 200 miles on it city and hwy. no issues runs like a champ, no vibes, no smoke, low egts, low coolant, great oil pressure idle and wot. She moves quickly. Still havent even fine tuned the valves but most were on, just a couple I think 2,3,5 or around that area. Maybe the exhaust side. who knows. prolly should of paid attention there but at that point I was thinking nah.........
Wish I could tell you more........ This motor is so smooth, you would have to drive it to believe it. I would trust this truck in a heartbeat OTR, yah its been breaking down past 100k miles but really you look at it, everything is about replaced minus the motor and between pics and dyno and oa's , no doubt this is not that big of a ticking time bomb, so to speak. Yah, I agree, the head should of been taking apart, I even bought the tool, 2 of them now, first didnt work. But by the time I got the piston in, im like, gosh, I can start her up in a few more hours........ So thats where im at. I would of done a full compression again, but I already gave it back to mechanic and that would of taken 1 hour of my time.. Not alot, but I was anxious to feel proud, or a failure
Now with that all said, somebody wants to come and buy it. Im willing to work with ya on doing a full compression test and taking apart the head, if the cash is there of course. For further diagnosis. Say something is there or not, it will cure the itch to alot of people. As of now, I know theres always a reason why something breaks, but as is now, im just going by wear and tear and that pushrod past its balance point of bendage and thats why it happened instantly. And the extra few miles I had to drive to pull on median caused the heat for the cracks and hole to happen. Or maybe the hole happened from leaving it running unfixed for maybe over 30 minutes or so multiple starts up and off trailer bringing it home...
Case be now, she purrs good as new imho. but if it breaks in another 1000 miles or 10000 miles or 500000 miles, only time will tell!!! Just not from me anymore..........