Another thought, following up on Jim's. To replace the crank gear, you're going to have to remove the pulley from the crank to get it and the timing case cover out of the way. If you happen to have a big puller and the head for it to fit around the groove in the pulley it can be done, but it can be a bear and is much easier on a press and less apt to break or ship the pulley. A regular two or three jaw puller will often just bust chips out the edges of the pulley without moving a thing, leaving you to have to replace that, too. That argues for taking it in to have it pressed off, at which point you might as well have the new gears in hand and have them pressed back on while you're there. And I can say for sure that, press or no, heat is a big help in getting the pulley off and back on.
The cam itself comes out pretty easily with bolts you reach through holes in the gear. Removing it does mean lifting your rocker arm assembly to get your push rods out beforehand so that the cam comes out smoothly. Not that much added in work in the context of what you're into already.
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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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