These keys may be easily modified to fit the H-D installation. Keys are available for this application with various degrees of offset, where the top is shifted slightly sideways from the bottom, causing a partial mis-alignment. This key aligns the oil feed passage in the pinion shaft with the transfer hole in the right flywheel, which supplies oil pressure to the crank-pin.īy a happy coincidence, the dimensions of the key are very similar to a key used in common automotive applications: the Chrysler “LA” (small block) V8 camshaft drive (and probably other brands and engines). However, the following idea may prove useful.Īlthough different pinion shafts are used in 1912-* Harley-Davidson V-twin engines (45, VL, UL, knucklehead, panhead and shovelhead), they all use the same pinion shaft key (23985-12). There is no easy method of dealing with this, as the cam shaft and gear are 1 piece in the earlier engines. The cam(s) and or breather assembly may be out of time due to “stacked” production tolerances (as well as the indifferent quality of some after-market replacement parts).
When an engine is re-built or assembled from parts, the rotational position of the pinion shaft and stack may not “time in” to the H-D factory specifications.
Re-timing Harley-Davidson Cams and Pinion Gears
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