mxu 400 Manuel atelier : Page 50

          Inspecting Camshaft Bearing
Journal

 1. Inspect the bearing journal for scoring, seizure
    marks, or pitting.
 2. If excessive scoring, seizure marks, or pitting is
    found, the cylinder head assembly must be
    replaced.
Measuring Camshaft to
Cylinder Head Clearance

 1. Remove the adjuster screws and jam nuts.                                                             CC145D
                                                          6. If clearance is excessive, measure the journals of
                                                             the camshaft.




                                               CC005D
 2. Place a strip of plasti-gauge in each of the cam-
    shaft lands in the cylinder head.                                                                    CC287D

 3. Place the valve cover on the cylinder head and        NOTE: If the journals are worn, replace the cam-
    secure with the valve cover cap screws. Tighten      shaft; then measure the clearance again. If it is still
    securely.                                            out of tolerance, replace the cylinder head.
  NOTE: Do not rotate the camshaft when measur-          Inspecting Camshaft Spring/Drive
ing clearance.                                           Pin
 4. Remove the cap screws securing the valve cover to     1. Inspect the spring and unloader pin for damage.
    the cylinder; then remove the valve cover and
    camshaft.




                                                                                                          CF061A

                                                MD1261     NOTE: With the weight extended, the unloader
 5. Match the width of the plasti-gauge with the chart   pin should be flat-side out; with the weight
    found on the plasti-gauge packaging to determine     retracted, the unloader pin should be round-side
    camshaft to cylinder head and valve cover clear-     out.
    ance.




3-20