Posted by Christopher Mikesell on July 03, 2013 at 19:49:29 from (76.226.29.47):
I am trying to chase down the gremlins before they can cause future problems in my SC engine. I figure that if I can find out what caused the problems that I see, then I might be able to figure out where to look for other problems, and where I do not need to look. Below, I have listed what I have found so far, and what I think are the causes. So far, I have found badly worn valves and cylinders with a pronounced ring ridge. However, the pistons and bore are still within factory spec below 3/4" below the ridge. Also, the ring lands are worn so that I can pass a 0.010" feeler gauge between the first compression ring and the land. All of the other rings have less than 0.004" play. Also, the camshaft looks very good and the lifters are snug in their bores. The gears under the timing cover don't seem worn and the governor parts are tight. I presume that the valve and cylinder wear was caused by abrasives entering the engine, since the tractor did not have the original air cleaner when I got it. Also, I have found that all of the steel backed babbit bearings were badly worn but original, with the exception of #1 connecting rod bearing which was dated 1968. All of the safety wires and clips were in place and undisturbed except for the ones on #1. Also, the #1 throw was out of round and the "new" bearing was worn almost until the babbit was gone on the top side. The tractor had no functioning oil pressure gauge and a new gauge revealed low oil pressure. I checked the rocker arms before installing the gauge, and they were oiling. I traced the low oil pressure to a stuck oil plunger and it then read 20 psi after I freed it. Also, it seems that #1 connecting rod throw is the farthest bearing from the pump. Thus, I conclude that the plunger got stuck sometime in the distant past (pre-1968), causing the wear on the bearings. I hope that I have found all of the problems in the engine, but if you have read this far, and can think of anything else that I should check before getting it fixed, please let me know.
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Today's Featured Article - An AC Model M Crawler - by Anthony West. Neil Atkins is a man in his late thirties, a mild and patient character who talks fondly of his farming heritage. He farms around a hundred and fifty acres of arable land, in a village called Southam, located just outside Leamington Spa in Warwickshire. The soil is a rich dark brown and is well looked after. unlike some areas in the midlands it is also fairly flat, broken only by hedgerows and the occasional valley and brook. A copse of wildbreaking silver birch and oak trees surround the top si
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