TM 9-2320-260-34-1
3-5. VIBRATION DAMPER MAINTENANCE (Contd)
2. Check vibration damper (1) for wobble:
NOTE
Crankshaft must be kept at front or rear limit of thrust while
checking vibration damper wobble.
An assistant using a prybar can keep crankshaft at front limit of
thrust.
a. Place dial indicator with holding fixture on engine (3).
b. Position dial indicator plunger at surface (2) of vibration damper (1) and zero dial indicator.
c. Rotate vibration damper (1) using engine barring tool and take reading. Replace vibration
damper (1) if reading exceeds 0.004 in. (0.102 mm).
1. Remove six screws (6) and lockwashers (5) from vibration damper (1) and crankshaft flange (4).
Discard lockwashers (5).
2. Loosen vibration damper (1) by tapping with soft-head hammer and remove from crankshaft
flange (4).
1. Inspect vibration damper (1) for cracks and breaks. Replace vibration damper (1) if cracked
or broken.
2. Aline and check vibration damper inner (7) and outer (8) alinement marks are not more than
0.625 in. (15.88 mm). Replace vibration damper (1) if alinement marks are not alined.
1. Position vibration damper (1) on crankshaft flange (4). Use soft-head hammer if necessary.
2. Install vibration damper (1) on crankshaft flange (4) with six new lockwashers (5) and screws (6).
Tighten screws (6) 55-60 lb-ft (75-81 NZm).
3-8
