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The easiest way to check timing gear (be it only gears, gears with chain or even sprockets with belt) is to open the distributor cap and place it out of the way so the distributor rotor can be seen. Next, using a socket on the crankshaft center bolt, rotate the engine in the direction it normally turns just about 30 degrees. Now mark with a crayon(or anything you have handy) the position of the distributor rotor to the base where the cap belongs and mark the crankshaft pully to engine block in an area easily visible. Finally, rotate the engine BACKWARDS very slowly until you see the distributor rotor begin to move...STOP right there. Now you'll look at the separation of the marks you made on the crank pully and block. If the distance is a lot (10 degrees or more) things are getting sloppy in there. At 25 deg or more, do a surgical/visual inspection, something's going to break.
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