spun bearing?
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Cross-Country
Joined: Apr 2004
Posts: 69
Likes: 1
spun bearing?
I used to own a JD 3150 tractor-in line 6 cyl., 95 hp. After having some clutch work done at the dealership, the tractor developed a leak from the rear main seal. The dealer said they had replaced the seal when they did the clutch so it was under warranty. They came and picked it up and told me three days later that a bearing was spun and the engine was completely shot and would have to be replaced ($8000). It was not even rebuildable. This tractor had lost about 6 quarts of oil but it held 4 gal. The engine had never used more than a couple quarts/year, never had a knock, or ping. The engine started very easily and did not smoke. It even started fine when it left my house. Could an engine with no symptoms of failure be so worn as to be non-rebuildable? I think the stealership was trying to do me in. I have since traded tractors with another dealer and when they get the 3150 in the shop I will decide if I have a legal case. Just looking for opinions from others about the condition of that engine. Thanks.
Hotshot
Joined: Feb 2004
Posts: 11,697
Likes: 3
From: Marengo, Iowa
sure doesn't sound on the level to me. Rod bearings can spin from lack of lube, worn condition, foreign material in the oil, anything you can think of to make the bearing grab on the crank and spin with it. Not rebuildable is a new one on me though, since the only way that could be is of the block was trashed. Sleeves, crank, pistons, heads are all that need work typically, and those engines are intended to be serviced hardcore, not throuwn out in the trash every few hundred thousand miles...if it were that bad, it would have shown up with other symptoms. Besides, if it had a spun bearing, you could rest assured you would have heard the knocking...
Playing in the Dirt
Joined: Oct 2005
Posts: 2,302
Likes: 1
From: Southwest Georgia
Usually a spun bearing means turning or replacing the crank and rods. I personally, have never seen, nor heard of a spun bearing causing a tractor engine to be scrapped. Did the dealer tear down the engine and pull the main bearing caps to deterrmine that a bearing was spun? If not, how do they know. Did they show you the spun bearing, main cap and crank? They should have. Also a spun bearing generally has a rod knock sound with it. I would be very suspicious of the dealer.
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Cross-Country
Joined: Apr 2004
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As it turned out, the block was damaged from the thrust bearing failure. I never will know but still wonder if maybe the engine was sabotaged after it left my house for the rear main seal repair. I do know the service manager was not very happy with me when I went to the regional manager because a simple clutch job took 4 weeks with a bill of $7000. He had to renegotiate the price. Oh well.
Hotshot
Joined: Feb 2004
Posts: 11,697
Likes: 3
From: Marengo, Iowa
Heck, a clutch job only should not take that long, nor be that expensive... it isn't that darn hard to split the tractor and such when you have all the tools and equipment. If I can do one in a weekend, surely they can. I wouldn't know how they could intentionally get a thrust bearing to spin, but it does seem odd. That doesn't happen too often.
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