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Weird MF65 crankshaft problem

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Doug

02-23-2002 20:49:00




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I'm rebuilding an MF65 with Continental G176 gas engine and discovered that the crankshaft had been pushing forward in the block. The result is that the rear shoulder of the center main bearing was worn totally off, and the crank shaft had been rubbing badly on the oil pump and the rear face of the block. This also appears to have thrown off the timing because the gears were not perfectly aligned. It almost looks like the main shaft from the transmission was pushing forward on the rear end of the crankshaft. Nothing else appears to be worn. In fact, other than this problem, the engine looks brand new. Does anyone have any idea what might have caused this and what I can do to prevent it from recurring when I put the motor back together?

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Mike

02-27-2002 10:24:25




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 Re: Weird MF65 crankshaft problem in reply to Doug, 02-23-2002 20:49:00  
Thrust bearing failure comes from clutch or torque converter thrust. It is common after a crank grind, because the face is often left rough.
Smooth it up,check the clutch,and put a slight chamfer on the narrow end of the main bearing so that oil will be directed to the thrust face. Good Luck; Mike



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Doug

02-27-2002 14:44:41




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 Re: Re: Weird MF65 crankshaft problem in reply to Mike, 02-27-2002 10:24:25  
Mike -

The crank face is not only smooth from wear, it is now a tiny bit concave. Looks like about 5 to 10 1000ths worn off. Do you think the crank is trashed? Also, what do you mean chamfer the narrow end of the main bearing? Which is the narrow end?

- Doug



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henning is correct

02-24-2002 22:19:54




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 Re: Weird MF65 crankshaft problem in reply to Doug, 02-23-2002 20:49:00  
henning is correct! the clutch was adjusted sothere was no free play or the last owner kept his foot on the clutch, putting constant pressure on the thrush bearing! permatmaturly wearing out the trust on the back edge!



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henning thomssen

02-24-2002 08:41:06




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 Re: Weird MF65 crankshaft problem in reply to Doug, 02-23-2002 20:49:00  
I was once told,that every time the clutch is disengaged there is pressure put on the thrustbearing in the engine,so it is not a good idea to stand on the clutch with the tractor in gear when stopping a short time.Anybody have thougths on that?



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gatractorman

02-24-2002 04:46:06




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 Re: Weird MF65 crankshaft problem in reply to Doug, 02-23-2002 20:49:00  
Hey Doug, you should have what is called a thrust bearing on one of your main bearing journals this problem your having is what it prevents, it will be the same size bearing as the rest of the mains but it will have two ears on each side at 90 degree angles to the bearing surface, it sounds as if one side is either missing or worn completely out.



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