Mark - I've replaced several busted cam gears on Super M/400/450's. Aside from some heavy, awkward parts (front bolster assembly) replacing the cam gear is not terribly difficult for someone with average mechanic skills. Having an engine hoist or a front loader makes the job MUCH easier/safer. And you will need a 2-1/2" socket to remove the crankshaft pulley. Figure $150 +/- for a new cam gear.
Incidentally all the ones I've done have simply had the hubs break out of the cam drive gears. In all cases the camshafts, lifters, etc. were undamaged. Hopefully yours will be same!
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Today's Featured Article - Choosin, Mounting and Using a Bush Hog Type Mower - by Francis Robinson. Looking around at my new neighbors, most of whom are city raised and have recently acquired their first mini-farms of five to fifteen acres and also from reading questions ask at various discussion sites on the web it is frighteningly apparent that a great many guys (and a few gals) are learning by trial and error and mostly error how to use a very dangerous piece of farm equipment. It is also very apparent that these folks are getting a lot of very poor and often very dangerous advice fro
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