After all this time inspecting, engineering, machining of new parts and rebuilding, it is fun to actually reach the point were it can start to go together again. The cams after straightening and machining are set. The newly machined bronze center and rear cam bearings, along with new front ball bearings are installed on the camshafts. All three bearings on each shaft are a .0005 interference fit into the cam bearing supports of the crankcase. This ensures that they will not loosen up in use.
The rear bearings are pressed in and the center bearing is split and assembles onto the cam after it is part way in. Next the two shafts with the middle and front bearings on are carefully pressed in so as to not harm the ball bearings. Note how wide (duration) the lower right cam lobe is, this is one of the secrets to the Mercer”s racing success. It is comparable to a modern racing cam.
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