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312 motor problem?

2083 Views 15 Replies 8 Participants Last post by  Yooper75
So i picked up a 312 yesterday. I didnt need it, but it was cheap, in good shape body wise, little to no rust. Small home made wheel weights and a brush guard. That pins on and off just like a normal attachment for the front of a 3xx series. I got it loaded in the trailer using the not finished 318 and after I moved the 78 sears ss10 and the cab and blower, got it home and started looking.

It will turn part way over by hand, then clunk and stop dead. It will roll over back the other way and same thing. This is just my hands on the driveshaft. No tools or anything else. It feels like it is coming from the engine, not the hydrostat. Im guessing a dropped valve? It doesnt feel like it has compression but I pulled the spark plug and stuck a screw driver in and it moves when rolling by hand.

Is this thing worth fixing to use as a mower? It has the 38" deck on it. No front hydros but has 1 lever for raising the deck so Im guessing they could be added if I wanted, maybe at least 1 rear and 1 front set to use a 2 way blade or raise and lower a dump trailer I still havnt had time to start on.......

What is common in the k301? Is it worth repowering? or maybe just a used motor? I will try to get a pic up tonight, and when i say cheap, it was $50 bucks, so i think its at least worth looking into.
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Rod is definately smoked, head is off, piston doesnt move. Pics as promised

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so here is what I found...........

Not sure if I should repower with a used k301 or spend 80 on a rebuild kit and pay a machine shop or option 3, rings, rod, piston, head gasket and let her mow a few years. Im leaning toward option 3. There isnt a noticable lip in the cylinder, not much wear anywhere really. No aluminum on the crank from the rod. Worst part is there is a small hunk broken off the bottom of the cylinder. I dont think its far enough up to matter, but......

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The guy did say it revved way up and then clunk, never moved again. so he went and purchased a x300 new. His property was extremely hilly also. guess ill need to look into the governor also.
The oil didnt smell like gas but man was it thick and had lots of metal in it. I had the pan upside down for 2 days and it still hasnt all run off of it yet. Its probably the worst i have ever seen.
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