Well, it all depends on how much sludge is inside the engine. A number of years ago I bought a 1939 Farmall H that we were able to make run so we could drive it onto the trailer. Maybe I should say that it barely ran. Anyway, once I got the tractor home I pulled the valve cover to set the valves in an attempt to improve the way is was running and I could not see where the valves were. The valve cover was that full of sludge. I then dropped the oil pan and you can guess what that looked like. Well, I could not hurt anything with the engine in that condition, so I pulled the tractor out the shop and got out the pressure washer and started washing the inside of the engine with hot water and a degreaser. I let the engine set and dry overnight and then put it back together and filled with 15w40 oil and started her up. The tractor engine ran better after a tuneup and I was able to check out the condition of the rest of the tractor before I pulled the entire tractor apart for a major overhaul. Sure was much easier working on a clean engine. I'm including a picture of what it looks like today.
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Today's Featured Article - Experimental Tractors Article - by Danny Bowes (Dsl). Tractor technology appears to have nearly hit it's pinnacle of development. If you agreed with the subtitle, you are rather mistaken. Quite, actually. As a matter of fact, some of the technology experimented with over 40 years ago makes today's tractor technology seem absolutely stale by comparison. Experimentation, from the most complex assembly to the most simple and mundane component, is as an integral a part of any farm tractor's development
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