Re: Spun bearing

Posted by Dennis Benson on January 30, 2003 at 10:50:02 from (64.12.96.236):

In Reply to: Spun bearing posted by Scott on January 30, 2003 at 08:39:27:

Back in the 1970's I worked for an engine rebuilder. One of my duties was to tear the engines apart and cleaned them. The crankcase has a distinctive odor when the bearings are bad, more of a burned smell. You can check this at auctions before bidding on the machine by smelling the dipstick or oil fill cap. It can ahppen from impurities in the oil, general worn condition, overheating, or overloading. I had engines spin bearings, the first was a 1963 Rambler, it knocked badly until it quit running, one rod was snapped off and laying in the oil pan, another was melted to the crankshaft. That was before I knew anything about engines, and was a junk car to begin with. The second one was a IH 101 combine. I had just bought it, and was working out the bad bearings and rust when it begin sputtering and loosing power. It would not turn over with the starter, and would barely turn over by hand. The next one was a 1952 Chevrolet one ton truck, it got down to 40 below zero and I started it the next morning and it didn't get enough lubrication, it knocked loudly. At this point I still didn't know a lot about diagnosing, but I was working in the engine rebuilding shop, and they weren't that familiar with diagnosing either. I stopped farming and left that job and got a job with a circus as a mechanic. I learned a lot about diagnosing spun bearings there. They had big block Chevrolet engines pulling the old semi trailers, about 30 of them. We would come up to one along the freeway, the driver would say, "I think it ran out of gas," and the head mechanic would turn the engine over by hand and say it had bad bearings, and the manager would call a wrecker, we would replace the engine with a fresh one from the nearest NAPA. To make a long story short, the engines with a stroke longer than the diameter of the bore will knock like crazy, and run until they throw parts all over the place. And an engine with the bore larger than the length of the stroke will act like it ran out of gas, and will not turn over, or turn over with great difficulty, and you will think it ran out of gas, and you will think the battery is dead or the starter is broke, but they will not turn over by hand.

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