A Series Diesel Engine Base Engine Components 162
Rocker Lever, Valve Stem, Push Rod,
Tappet, and Camshaft
Excessive valve lash can indicate a worn valve stem
or rocker lever.
Loose rocker levers and the need to re-set the valve
clearance frequently, can also indicate cam lobe or
tappet wear. If an inspection of the levers, valve stems
and push rods does not show wear, then tappet and/or
cam lobe wear can be suspected.
Caution : Anytime a new camshaft is installed, new
tappets must also be installed.
The camshaft lobes can be visually inspected after
removing the pan. Similarly, the face of the tappet can
be inspected after removing the push rods and lifting
the tappet.
A several damaged camshaft journal (s) can generate
metal chips which will be found in the pan and filter. As
the clearance in the journal (s) increases, a small
decrease in oil pressure may be detected.
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