My Tractor Forum banner

312 motor problem?

2086 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.
1 - 2 of 16 Posts
I fixed a lot of those iron Kohlers that broke the rod and they usually do break a chunk out of the lower cyl where it protrudes into the crankcase,it usually doesent affect them.If done right that engine has many years left on it.One I remember in particular was on a JD 212 back in the 70's at the shop I hung around as a kid.The block had a crack and we had it welded up rebuilt the engine and it ran for 20 more years being used weekly for mowing.The owner finally drove it out by the road with a FREE sign on it because the deck was shot.
All the k motor.s seem to break like that,,anyone ever hear why they fail at tha t point,looks like it has plenty of material there.I think the Onans break from low oil and heat on one .side
Low oil is usually the culprit Biker,some claim if you do too much sidehill it will rob the sump but I don't buy it.I did some awful sidehill with those engines and never had one fail from it but I did run the oil level a little over the full mark on mine.Overspeeding is definitely another cause from gov problems.
1 - 2 of 16 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.