Ok so here's the whole story. I was going to meet a few friends for a fun day at our custom gun range but before I could get out there, I hydrolocked the jeep like a dummy. It died on the spot, still in the water. Back tires in up to the taillights but front tires only in about 4". Almost made it out...
Well I tried to turn it over a few times with no avail as I waited for my friends to come get me. We pulled the airbox and found a soaked air filter and standing water in the airbox and intake manifold. So a lot of water probably got in. We let it dry out for a few hours before pulling it home. Once back we pulled the plugs and shot some water out. It wouldn't turn over so we shot some more water out. Finally I noticed that the head gasket had blown and that smoke started pouring out of the gap.
Since then, I have flushed the oil a few times. I have replaced the head gasket. Everything looked good as far as I could tell but this was my first time tearing into and engine, but I had a more knowledgeable mechanic take a minute or two look at it. No noticed cracks or gaps. I have changed out spark plugs. I have compression checked the cylinders (95, 120, 0, 120). I just retightened the rocker bolts since I fear I may have overtorqued them previously.
I'm trying to figure out my next course of action. A coworker thinks that if the head gasket didn't fix it, I likely have damaged something deeper in the engine and it might be easier to just swap in a new engine.
So the engine needs a lot of gas to stay running and it will stall out if your foot isn't on the gas. It's also very loud and backfires sporadically. With all of that, here are some of the possible culprits I have read about.
Water in the gas tank - It was sitting under water for the better part of 15 minutes, and this could cause it to keep stalling out.
Bad head gasket replacement - I took my time and did a good job with it, but when I finished the other guy asked if I torqued the last bolt to 100 and then to 110. I didn't do this but I was figuring that I could redo this if that is a big deal.
Warped cylinder head - I went to the base auto hobby shop and the best straight edge they had was a curved thin metal ruler. Not the best tool for the job. I should have had it milled.
Worn out piston rings - May have caused the zero compression reading.
Stuck valve - This is possible I guess but when doing the compression test, we put oil in the spark plug hole and still saw nothing good on the gauge. The compression test set told us that test would have indicated a bad valve.
I'm thinking that something is really busted in the engine causing the zero reading, but I haven't dug that far. I have a cramped timeline for this fix considering I'm leaving for Korea in a month so I would really appreciate any help in fixing this problem. Pics to follow...