TM 5-2420-230-24-2
Cam Followers/Tappets - General Information
B3.9 and B5.9 Series Engines
Page 4-2
Section 4 - Cam Followers/Tappets - Group 04
Cam Followers/Tappets - General
Information
Valve Tappets and Push Tubes
The valve tappets are mushroom-shaped. The convex
shape of the surface that contacts the camshaft lobe causes
the tappets to rotate as it lifts the push tube.
The ball end of the push tube fits into a ball socket in the
tappet. The other end of the push tube is fitted with a socket
into which the ball end of the rocker lever adjusting screw
operates.
A loose rocker lever and the need to reset the valve clear-
ance frequently can indicate camshaft lobe or valve tappet
wear. If an inspection of the levers, valve stems, and push
tubes does not show wear, then valve tappet and/or cam-
shaft lobe wear can be suspected.
Push Rods or Tubes (004-014)
Preparatory (004-014-000)
Remove the rocker lever cover(s). Refer to Proce-
dure 003-011.
Remove the rocker levers. Refer to Procedure 003-
008.
L-846