TM 5-2420-230-24-2
Overhead Set (003-004)
B3.9 and B5.9 Series Engines
Page 3-2
Section 3 - Rocker Levers - Group 03
Overhead Set (003-004)
General Information
Diagnosing Component Malfunctions -- Rocker Lever,
Valve Stem, Push Tube, Tappet, and Camshaft
The rocker lever group consists of the rocker lever assem-
blies, rocker assembly oil manifold, valve cover, and crank-
case breather.
Each cylinder of the engine has a separate rocker lever
assembly. The pedestal support has drillings to route the
oil flow to the shaft and levers.
The rocker levers are push tube actuated and use an ad-
justing screw to control the clearance between the rocker
lever and valve stem. The rocker levers do not use a bush-
ing in the bore for the rocker lever shaft. The rocker lever
must be replaced if the bore is damaged or worn beyond
the specification limit.
The ball end of the push tube fits into the ball socket in the
tappet. The other end of the pushrod has a ball socket in
which the ball end of the rocker lever adjusting screw
operates.
Excessive valve lash can indicate a worn valve stem, push
tube, valve tappet, or rocker lever.
L-830
