TM 5-2420-230-24-2
Vibration Damper (001-052)
B3.9 and B5.9 Series Engines
Page 1-92
Section 1 - Cylinder Block - Group 01
Inspect for Reuse (001-052-007)
Check the mounting web for cracks. Check the housing for
dents or raised surfaces. Replace the damper if any of
these defects are identified.
WARNING
When using solvents, acids, or alkaline materials for
cleaning, follow the manufacturer's recommendations
for use. Wear goggles and protective clothing to avoid
personal injury.
Clean the damper with solvent.
Viscous Damper
The viscous damper is filled with a silicone fluid. After many
hours of use, the silicone fluid can become thicker and
expand. To determine if the damper thickness is correct,
remove the paint from the damper in four locations on
either side of the damper. Measure and record the thick-
ness of the damper in four places. Measure the thickness
3.18 mm [0.125 in] from the outside of the damper. Replace
the damper if its thickness varies by more than 0.25 mm
[0.010 in].
Spray the damper with spot check developer, type SKD-NF,
or its equivalent. Heat the damper in an oven (rolled lip side
down) at 93C [200F] for 2 hours.
L-770