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Cub Cadet with Kolher Command 25 blows all of the oil out the crankshaft seal


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10-18-14, 04:59 AM   #1  
Cub Cadet with Kolher Command 25 blows all of the oil out the crankshaft seal

I have a Kolher command 25 hp engine in a Cub Cadet 2550 that will blow all of the oil out of the engine PTO crank shaft seal. It does this in 30 minutes or less. This is what I have done so far. I have changed the crankshaft seal, the crankcase vent reed, cover gasket and cover plate. Does anyone know what I should do now?

 
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10-18-14, 12:10 PM   #2  
Is the engine running well? If not check the compression. It may be losing compression into the crankcase.

Also, was the sealing surface on the shaft in good shape for the seal to fit against?

 
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10-18-14, 06:14 PM   #3  
It does run good and the seal surface is very good. The engine just dumps the oil out of the PTO end of the crankshaft.

 
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10-18-14, 06:19 PM   #4  
I also did a leak down on it and the cylinders are fine.

 
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10-18-14, 06:40 PM   #5  
I wonder if the main bearing tolerance is good for that end of the crankshaft. There has to be a reason. It would come down to excessive pressure, but that could or should be relieved out the crankcase vent, or a poor combination of bearing tolerance/seal/seal surface at the crank shaft.

 
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10-18-14, 06:45 PM   #6  
Does the reed vent "flap" open to the outside and there's nothing restricting that movement?

 
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10-19-14, 04:03 PM   #7  
the reed has all the room it needs to move. I have replaced even the cover and gasket. The bearings and seal are in great shape. I am at a loss on this one.

 
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10-19-14, 05:26 PM   #8  
Given all the parts are good I'll have to join you at being at a loss on this one. There's a lot of shop guys here, though. You should get some help.

 
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10-19-14, 05:46 PM   #9  
Just a wild thought. Since this is a pressurized system, a full flow oil filter is called for. Do you have a Kohler filter in place?


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10-19-14, 05:53 PM   #10  
Does the engine smoke while running? Double checking... you did a leakdown test and did not detect abnormal leakage into the crankcase? If the side play on the shaft is good, the crank sealing surface is good, and the bore where the seal fits is good, I would suspect a seal problem. Maybe the spring behind the lip popped out?


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