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TM 5-4210-220-34
2-19.
ENGINE - Continued
(4)
Loosen the locknuts at the upper ends of the push rods, next to the devises, and unscrew the rocker
arms from the push rods.
NOTE
If the rocker arms and shafts from two or more cylinders are to be removed, tag them so they may be
reinstalled In their original positions.
(5)
When removing the cam followers and associated parts, tag them so they may be reinstalled in their
original location.
(6)
Install remover J3092-01, flat washer, and the locknut on the push rod, with the lower end of the tool
resting on the upper spring seat.
(7)
Thread the nut down to compress the spring.
(8)
Remove the spring seat retainer from the groove in the cylinder head.
(9)
Unscrew the locknut to release the spring Then remove the nut, flat washer, and tool from the push rod.
(10) Pull the push rod, spring, spring seats, and cam follower out of the cylinder head.
INSPECTION
(1)
Clean the cam followers and wash with engine oil (item 17, Appendix B).
WARNING
Dry cleaning solvent P-D-680 (safety or Stoddard’s solvent) is potentially dangerous. Avoid repeated and
prolonged breathing of vapors and skin contact with the liquid. Do not use near open flame, arcing
equipment or other ignition sources. Always wear eye protection and protective clothing. The flash point
of P-D-680 is 100 to 138 deg. F (30 to 59 deg. C).
Death or serious injury could occur if compressed air is directed against the skin. Do not use compressed
air for cleaning or drying unless the pressure is/has been reduced to 30 psi (2.11 kg/cm2) or less. When
working with compressed air, always use chip guards eye protection and other personal protective
equipment.
(2)
Wash all other components in dry cleaning solvent (item 10, Appendix B) and dry with compressed air.
Use a small wire to clean out the drilled od passages in the rocker arms and rocker shaft bolts.
(3)
Inspect the rocker arm shaft and rocker arm bushings for wear. A maximum shaft to bushing clearance
of 0.004 in. (0.10 mm) is allowable with used parts. Service replacement bushings must be reamed to
size after installation.
(4)
Inspect the rocker arms for galling or wear on the pallets (valve or Injector contact surfaces) If worn, the
surface may be refaced up to a maximum of 0.010 in. (0.25 mm). However, proceed with caution when
surface grinding to avoid overheating the rocker arm. Maintain the radius and finish as close to the
original surface as possible. Also inspect the valve bridges for wear.
2-175
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