TWeatherford
Full Access Member
I am no longer questioning whether I was right in yanking out my old 7.3 and sticking the 6.9 in. Whatever happened, it was not pretty. Here are pictures of the passenger side of the engine.
Ok, so first off something isn't right. Somehow a ton of water got in my motor. It started raining as we were pulling it out (durn Colorado weather), and has sat under a tarp for a few months, but this is a lot. So maybe expanding frozen water caused some damage, and definitely a lot of rust. There is a bunch of crap in there that couldn't have been in there the day I pulled it. Right before I pulled it, I fired it up, drove it to where I was going to pull it. Smoked like crazy, low on power, but pretty decent running.
As you can clearly see, 3rd cylinder back has a giant split in it. Any suggestions as to what caused that would be appreciated. What I don't get is that, when I did a compression test, all cylinders were showing 150-200 psi. My tester was probably faulty, but I wouldn't expect that cylinder to show anything at all.
Some history for those who care to know. I owned and drove this engine for 6,000 miles. It is a 91 engine that came in my 94 truck. No idea of mileage. It ran and drove well for me, until it started smoking badly. Subsequent compression test (which may not be very accurate due to a worthless compression tester) showed around 150-200 psi all around. It blew at the end of a 1500 mile trip to Colorado pulling a 2 horse trailer. I was headed up a 6 mile dirt road, about 3% grade. No gauges except stock, stupid, but I was really trying to keep it out of the throttle. Rolled across a scale earlier in the trip right at 14,000 lbs. Started smoking a lot and didn't sound so good, so I shut it down. After I got the truck towed, I put a real oil press gauge and had good oil press. No oil in coolant or coolant in oil that I could tell. Probably ran it 15 minutes total after it first problems, I don't understand how I could have done that with a cylinder wall totally caved in like that.
Tomorrow I'll try to pull the other head and see whats under there. I'm battling the flu and its cold outside. This one was fun enough to lift off and carry by myself.
Anyway, maybe someone has some ideas.
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Ok, so first off something isn't right. Somehow a ton of water got in my motor. It started raining as we were pulling it out (durn Colorado weather), and has sat under a tarp for a few months, but this is a lot. So maybe expanding frozen water caused some damage, and definitely a lot of rust. There is a bunch of crap in there that couldn't have been in there the day I pulled it. Right before I pulled it, I fired it up, drove it to where I was going to pull it. Smoked like crazy, low on power, but pretty decent running.
As you can clearly see, 3rd cylinder back has a giant split in it. Any suggestions as to what caused that would be appreciated. What I don't get is that, when I did a compression test, all cylinders were showing 150-200 psi. My tester was probably faulty, but I wouldn't expect that cylinder to show anything at all.
Some history for those who care to know. I owned and drove this engine for 6,000 miles. It is a 91 engine that came in my 94 truck. No idea of mileage. It ran and drove well for me, until it started smoking badly. Subsequent compression test (which may not be very accurate due to a worthless compression tester) showed around 150-200 psi all around. It blew at the end of a 1500 mile trip to Colorado pulling a 2 horse trailer. I was headed up a 6 mile dirt road, about 3% grade. No gauges except stock, stupid, but I was really trying to keep it out of the throttle. Rolled across a scale earlier in the trip right at 14,000 lbs. Started smoking a lot and didn't sound so good, so I shut it down. After I got the truck towed, I put a real oil press gauge and had good oil press. No oil in coolant or coolant in oil that I could tell. Probably ran it 15 minutes total after it first problems, I don't understand how I could have done that with a cylinder wall totally caved in like that.
Tomorrow I'll try to pull the other head and see whats under there. I'm battling the flu and its cold outside. This one was fun enough to lift off and carry by myself.
Anyway, maybe someone has some ideas.
