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#1
05-02-2022, 05:47 PM
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K301 rebuild
I have the block almost stripped all the way down and I found a couple things worthy of note. The part of the camshaft that operates the points plunger has visible wear in it. I’m surprised by that because the plunger is aluminum. I feel like I need a new cam now because it would be cheaper than having the machine shop apply weld then machine it back down. Thoughts?
My second issue is that now that I’ve opened the engine, someone has been in here because the con rod end cap has two different nuts. Also, at the VERY bottom of the cylinder is an arc shaped nick. If you were to cut a dime exactly in half, it would cover this spot. Apparently this engine threw a rod at some point. I hope the block isn’t trashed, I like this engine set-up for my Cub. Thoughts? Third, I have no balance gears. The casting is in the block, but the studs they would ride on were never installed. Thoughts? I’ll try to get pics posted, I downloaded an app to reduce my file size because I don’t have a computer. Just an iPhone. 
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#2
05-02-2022, 05:52 PM
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I was able to resize the pic. I hope y’all can see it.
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#3
05-02-2022, 05:54 PM
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Here’s the camshaft wear at the plunger.
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#4
05-03-2022, 11:48 AM
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Was the piston on std or oversize? Should be stamped STD or .0??" on top.
You can have the block sleeved, that is an option. Looks like a different Cam is in order. The 125's did not have balance gears whereas the 321's did.
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#5
05-03-2022, 12:09 PM
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The piston had no stamping on it. The bore is out of spec by .0095” anyway. I will have the machine shop take corrective action. Another thing is that my connecting rod has two nuts (that look different) instead of the two bolts like I’ve seen online. The crank is still within spec by .0005” inches so I won’t have it machined, makes me think it’s a crankshaft that the engine wasn’t born with. The two nut thing bothers me though. I attached a pic.
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#7
05-03-2022, 01:02 PM
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I can’t find any brand new cams other than used ones on ebay. Do all the 12hp K301 engines with points ignition have the same lift and duration profiles on all the lobes? Lots of cams out of K301 equipped Deere, Wheel Horse, Gravely etc. Do y’all know of a new cam supplier?
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#9
05-03-2022, 01:49 PM
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Ok so I need to find a cam out of one of the above mentioned Cubs.
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#10
05-03-2022, 03:18 PM
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Yep that looks a bit strange. While you are gonna need a new piston
anyway ( after the machine shop advises on size) I think I would also replace connecting rod and then you won't have to think about what went on in there prior to you. Looks like you are getting there. Nice work. Ken
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