I worked on an 8n last summer that had a similar fate, with the creek water coming over the steering wheel. In servicing that very nice 8n, I found the following that you may find helpful.
1. The sherman trans does not have a drain that you can get to without splitting, but it is fed oil from the main tranny. Thus it will hold water even after you have drained the 3 plugs. The only way to get it out is by the dillution method. Drain and replace the tranny oil as you have done, but do it again in a few months, and I found it necessary to do it a 3rd time this spring.
2. The steering gear box on the 8n has no drain plug. Water will go down the steering wheel shaft into the gear box. Some method of sucking it out with a small tube through the fill plug may be necessary. I loosened the side cover plate and let the oil/water out, then refilled it w/ oil. I think the 2n steering box drains into the tranny, so this may not be an issue for you.
3. Generator or alternator? I found the copper wiring leads to the alternator to be badly corroded (green) at the crimp on end terminal. Cut it back about 1/2 inch and put on a new crimp. Battery cables also corroded very quickly, needing replacement. If you have a generator, you probably have a regulator that has some water in it. Take cover off and dry it out with daughter's (not the wife's) hair drier.
4. Where the lower section of the hood (ribs) is supported on the backside with a reinforcement, dirt has usually accumulated and usually stays dry, thus seldom giving a problem with rusting through. When submerged, this becomes wet mud and will accelerate the rust through quickly, so use a air gun and blow it out dry (especially difficult alongside the lower edge of the gas tank sides). 5. We found a live snake coiled up under the hood.
6. The points may become sticky, not pivoting correctly on the brass post, thus sticking partially open....thus no spark. You may as well just replace them and WD40 the back half of the distributor.
7. The headlights (metal can) had filled with enough water behind the sealed bulbs that when the lights were turned on, the bulbs immediately failed. They are supposed to have a drain hole, but it may be plugged.
8. The brake shoes rusted just enough to the back plates that they would not return to the up or free position.
9. The clutch disc may absorb just enough water to rust tight to the flywheel and pressure plate. If it hasn't become tight yet, depress the clutch pedal and clamp it down for a few days until it has a chance to dry out. I don't think there is a drain hole in the bottom of the bellhousing. It may be time to drill about a 5/16" hole at the lowest point of the bellhousing.The tractor that I worked on had been in the water for about 20 hours. The owner had been working some lower garden ground, and had gotten stuck in a muddy spot when one hell of a thunderstorm came up. He abandoned ship, running for the barn. The creek came up about 5 feet completely drowning the tractor. I've got it running well for him now. Best of luck in getting it back to good health. Paul Hetchler
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