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Re: 730 engine problems

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Christopher Mikesell

10-28-2013 20:18:47

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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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Christopher Mikesell

10-28-2013 20:33:56

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 Re: 730 engine problems in reply to Christopher Mikesell, 10-28-2013 20:18:47  
After thinking about it some more, your engine must be extremely high-time to get that much backlash. It is also possible that some water got into the front cover and rusted the gears, or that one of the gears was soft from the factory. However, if none of the gear teeth seem worn, then it may be that someone replaced the crankshaft gear with a non-case part either because it would save money or because they could not get a replacement.

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