By RJ Hamner
I was breaking down the engine getting it ready to go to the machine shop. Everything was pretty normal until it tried to remove the PTO race and the engine pulley. As I was setting up the "puller" I noticed the end of the crankshaft looked different but never gave it much thought. After a half a can of PB Blaster,destroying the engine pulley and turning the air in the shop blue I was able to get the crankshaft free. There was a LOT of baked on crud and grease and I thought that was the problem. Cleaned everything up and found the race would not slide on the crankshaft??? Got out the measuring tools and found the answer. The end of the crankshaft was expanded will past the 1.125".
I had another crankshaft so I looked at the PTO end. It almost looks like someone bored the end and inserted some kind of tapered shaft and/or beat the heck out of the end and swelled the last 1/2"-3/4" of the crankshaft.
Can anyone think of a reason???
I finally picked up a Workhorse 700 and I’m doing a restoration with the exception of a Kohler K321 in place of the scavenged Tecumseh. Anyone done a similar swap and had trans issues or breakage problems? This isn’t going to be a puller, just gonna keep a 42” snow blade on it for small snows and use it for light duty towing and putting around. I have the engine sitting around from another repower project and I have access to a large variety of machine tools and fabricating equipment. Any thoughts?
Great to find a forum dedicated to my favourite tractor.
I have three at the moment and one I've just acquired is a C125 fitted with a K321 engine. I bought it as a known non runner and found that the conrod had disintegrated. I wanted to get it re-bored so, fancying a little more power than my last C125 I had it bored out to 3.5 inches and duly bought a rebuild kit from the US for a standard K341. My questions are:
If I use the crankshaft from the K321 do I need to get it re-balanced? It's in good shape though I would get it ground.
If I don't get it balanced and, bearing in mind it is for mowing so is hardly ever idling, will it shake it to nits? and, finally
Does anyone know of the whereabouts of a half decent crank from a K341 that might be bought?
Thank to all.
I have a K341 that gave up a rod a while back. talk about "Big Bang Theory..." anyway, I tore it down to see how bad it got inside and to my surprise other than the rod, and the very bottom of the piston skirts the inside looks great!
the crankpin looked like it might have taken some abuse but i used a white stone (lightly) and some polishing paper and it must have been debris from the rod or piston because it came right off.
i took some measurements and it does show some wear. the crankpin measures 1.498 to 1.499 (low limit is 1.499) and out of round a full .001 (spec calls for .0005 max)
the bore measures .002 out of the wear limits and is out of round about .005. going to need a new piston anyway and i can bore it at work . no problem there.
my question is, would you re-use the crank in that condition? I can't grind a crank at work... lol
I have a good Kohler K181RS. The "R" is a gear reduction originally for a high pressure pump. The crankshaft has a gear on the PTO end that meshes with a larger gear to run the pump at a slower RPM.
I am looking for another K181 crankshaft in usable condition. If anyone has one, or would be interested in swapping engines, please contact me.