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 TM 55-1905-217-34
(2) Cleaning and Inspection.
(a) Clean out the oil passages in the rocker arms, bracket bolts and rocker arm shafts with fuel oil and a small
wire and dry them with compressed air. It is very important to inspect the rocker arm shaft bolts for plugged oil passages.
(b) Inspect the rocker arm shaft and the bushings inside of the rocker arms for excessive wear. The diameter of a
rocker arm shaft is .8735 inch to .8740 inch, and the inside diameter of a rocket arm bushing is .8750 inch to .8760 inch.
Thus, the clearance is .001 inch to .0025 inch. A maximum clearance of .004 inch is allowable with used parts. Service
replacement bushings must be reamed to size after installation.
(c) Inspect the rocker arms for wear or galling on the pallets (valve contact surfaces). If worn, the pallets may be
refaced to a maximum depth of .010 inch. However, proceed with caution when surface grinding so that the rocker arms
are not overheated. Maintain the radius and finish as close to the original surface as possible.
(3) Repairs. Replace a defective rocker arm and shaft.
(4) Installation. Install the rocker arm and shafts in reverse order of removal ( (1) above).
b. Cam Follower and Push Rod Assemblies.
(1) Removal.
(a) Rest the cylinder head on its side, as shown in figure 3-52, and remove the two bolts that secure the cam
follower guide to the cylinder head. Remove the guide.
Figure 3-52. Cam follower and guide, removal and installation.
(b) Pull the cam follower from the bottom of the cylinder head.
(c) Remove the fuel lines from the injector and the fuel connectors.
(d) Loosen the push rod lock nut and I unscrew the push rod from the rocker arm clevis.
(e) Pull the push rod and spring assembly from the bottom of the cylinder head.
(f) Remove the push rod lock nut, upper spring seat, spring, and lower spring seat from the push rod for cleaning and
inspection (fig. 3-51).
3-71
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