TM 5-2420-230-24-2
B3.9 and B5.9 Series Engines
Vibration Damper (001-052)
Section 1 - Cylinder Block - Group 01
Page 1-91
Vibration Damper (001-052)
General Information
The vibration damper controls the twisting or torsional vi-
bration of the crankshaft. A vibration damper is engineered
for use on a specific engine model.
It is not economical to repair a vibration damper in the field.
Install a new or rebuilt vibration damper if the inspection
indicates that a damper is defective.
The viscous vibration damper has a limited service life. The
damper must be replaced if worn or damaged.
There are two different design vibration dampers used on
the B Series engines:
a. Viscous damper (A) for engines rated at speeds
above 2500 rpm.
b. Rubber element damper (B) for engines rated at
speeds below 2500 rpm.
NOTE: The rubber vibration damper (B) is available either
with or without the crankshaft adapter.
Preparatory (001-052-000)
Remove the drive belt.
Refer to Procedure 008-002.
Remove (001-052-002)
Remove the four capscrews.
Remove the vibration damper.
L-769
