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TM 10-4320-311-14
INSPECTION/REPLACEMENT:
a.
Clean camshaft with diesel fuel.
b.
Inspect all components for damage or excessive wear. Replace any components severely damaged or worn.
Figure 6-11. Recess of Needle Bearing
c.
Refer to Figure 6-11. Check the clearance at the thrust of the camshaft (cylinder block side). The camshaft
bearing has been press-fitted into the cylinder block. Maintain the recess between the press-fitted bearing face
and the thrust surface of cylinder block at 0.059-0.079 inch (1.5-2.0 mm).
Figure 6-12. Camshaft Bearings
d.
Refer to Figure 6-12. Check the OD of the camshaft on the needle bearing/cylinder block side (1) OD of
camshaft must be at least 0.587 inches (14.92 mm). Replace camshaft and both bearings (2) if OD is under the
wear limit.
e.
Check the OD of the camshaft on the ball bearing/crankcase cover side. OD of camshaft must be at least 0.981
Inch (24 90 mm). Replace camshaft if OD is under the wear limit.
f.
Refer to Figure 6-13. Check the condition of the cam lobes (1). The tappet is offset with regard to the cam
center and rotated during operation to prevent excess wear. Replace the camshaft and tappets if badly worn.
g.
Inspect the bearings for wear; replace if necessary.
6-15
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