Posted by Christopher Mikesell on October 28, 2013 at 20:18:47 from (76.226.29.20):
In Reply to: 730 engine problems posted by raymond anderson on October 28, 2013 at 16:52:57:
We have several Kohler 12hp engines on Gravely riding tractors. These gravely Kohlers have dual geared balance shafts for smooth operation. One is a high time engine with 2 over-bores on it. We rebuilt it when we got it and noticed that it made a metallic klinking sound every revolution when operating at low speed. After tearing it down and rechecking our measurements we have determined that this is due to the backlash in the balance shaft gears. I suspect that the knocking sound you describe is a backlash problem like ours. Also, your distributor shaft should have no noticeable side play between the bushings and the shaft. If it has much at all, then it should be rebushed. This can easily cause missing or rough and inconsistent running.
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