[NSRCA-discussion] YS help

[Ron Van Putte]

I had this happen on an OS 1.40RX.  To say that it was difficult to  
remove the bearing from the crankshaft is understating the problems I  
had.  I ended up using wood chisels and flat blade screw drivers.  I  
inserted a wood chisel behind the bearing, with the flat part of the  
chisel facing back. I supported the opposite side of the crankshaft  
and lightly tapped the chisel.  Then I moved to the opposite side and  
did the same thing.  Eventually the bearing started to slide on the  
crankshaft.  In my case, it turned out that the crankshaft was  
oversize and the bearing was seized on the shaft, so it didn't just  
slide off.  When there was enough of a gap, I turned the chisels  
around and used them as levers.  I progressively "walked" the bearing  
off by putting flat screwdrivers between the chisels and the  
crankshaft using the chisels as levers.  It took me at least half an  
hour of careful work to get the bearing off.  I chucked the  
crankshaft in my drill press and honed it to the right size using  
emory cloth.  I'm still using that motor.

Ron VP

On Jul 4, 2008, at 4:39 PM, Bob Kane wrote:

> Well, for all the YS engines I have rebuilt, I'm stuck with a  
> situation I have not run into before. I dissassembled 160DZ to  
> replace the main bearing. The 2nd to the last step in the  
> dissassembly porcess is to remove the crank. A few light taps and  
> it normally slides out. Well, this time the bearing stayed on the  
> crank. Usually it stays in the crankcase. Normally I would heat the  
> cranckcase to get the bearing to fall out, but how do you get a  
> stuck bearing off the crank? The fully circular rear face of the  
> crank shaft makes getting to the bearing difficult.  Suggestions?
>
> Bob Kane
> getterflash at yahoo.com
>
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