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This article is one of a series that describes how to disassemble, work on, and reassemble the Road Star engine. This particular document ” tells how to reassemble cams and lifters, including several time saving and verification tips. See the Complete Engine Tear Down, Orientation article in this website for details.
Be sure you refer to the service manual through all phases of this project.
Note: In this section, camshaft cover, refers to the item shown in the photo.
Understanding Cams: What Drives What
The cam drive gear rotates on the end of the engine's crankshaft. As it rotates, it meshes with the cam driven gear which rotates on the end of the rear cam. The drive/driven gears are those two gears that are exposed when you remove the chrome, cam, gear cover (aka the decompression cover).
The rear cam, in turn, drives the front cam via the integrated cam pinion-gears, which are located inside the camshaft cover.