TM 10-3950-672-24-2
The camshaft has lobes to operate the intake and
exhaust valves and a special lobe to drive the lift pump.
The valve lobes contact " mushroom" shaped valve
tappets which operate the push rods. The operating arm
of the lift pump rides directly on the special lobe on the
camshaft. The profile of the cam lobes is the same for
all B Series engines.
The tappets are mushroom shaped. The convex shape
of the surface which contacts the camshaft lobe causes
the tappet to rotate as it lifts the push rod.
The ball end of the push rod fits into a ball socket in the
tappet. The other end of the push rod is fitted with a
socket into which the ball end of the rocker lever
adjusting screw operates.
Flywheel Housing and Flywheel Several optional
flywheel housing and flywheels are used depending on
the application. Ring dowels are used to locate the
housing within 0.20mm [0.008 in.) TIR.
Note: Service housings are drilled. Re-dowelling is not
required.
5-164