(6) Check all capscrews and locknuts; lock
therefore, if inspection shows them to be defective,
install a new damper.
(1) Spray damper with dye penetrant.
(2) Place damper in oven heated to 200 F.
(930C.) Allow damper to reach oven temperature.
(3) Remove damper from oven and inspect
for oil smudges or fluid leakage.
(4) If oil smudges appear, discard vibration
(5) An alternate but less effective method
for inspecting viscous dampers is by shaking damper.
Movement of loose pieces will be felt or heard if fluid has
been lost. Tap front face at outside and inside seal. If
seal is broken, a hollow sound is heard at break.
(6) Inspect for wear at oil seal contact
surface; replace if flange is grooved deeper than 0.005
(7) Check damper mounting capscrew hole
Figure 3-174. Oil pump capscrews removal.
d. Inspection and Repair.
Note. Dampers are not subject to field repair,
Figure 3-175. Oil pump and suction tube installation.
Figure 3-176. Crankshaft hub capscrew removal.
c. Cleaning. Viscous dampers should be cleaned
3-38. Vibration Damper and Crankshaft
of rust, dirt or grease with a suitable solvent cleaner.
a. General. The vibration damper prevents
damage to the engine due to vibrating forces. The type
used is a viscous damper, which allows operation over a
greater variation in load and mass than other types, due
Place a wooden block between a
crankshaft counterweight and cylinder block wall to
Disengage lockplates and remove
Remove capscrew and flatwasher
(4) Using ST-887 flange puller, pull hub
Figure 3-177. Vibration damper removal and installation.