PRINCIPLES GASOLINE/DIESEL FUEL SYSTEMS - OD1620 - LESSON 2/TASK 2
(2) The timing device hub, with external left-hand helical splines
for engaging the internal helical splines of the sliding gear, has a tapered
bore and keyway. The hub is secured to the camshaft extension by a woodruff
key, nut, and setscrew.
The hub is usually counterbored to receive the
timing device springs.
The springs oppose the flyweight forces of the
weight and spider assembly.
(3) The weight and spider assembly has external right-hand helical
splines which mesh with the internal helical splines of the sliding gear.
The splined end is machined to receive the end play spacer.
flyweights are pinned to a flange