A vibration damper is mounted on the front end of the crankshaft to reduce torsional vibration to a safe value. See Figure 27753 .
1.Allen Head Bolt
4.Crankshaft Pulley Nut
Vibration Damper Location
The vibration damper assembly consists of a sealed outer shell, an internal flywheel, and a quantity of viscous fluid.
The outer shell, of the vibration damper is attached to the front pulley. The front pulley in turn is firmly attached to the crankshaft and turns at the same speed as the crankshaft, its motion being transferred to the flywheel through the fluid within the shell. Since fluid-drive" is more or less inefficient with frequent speed changes, considerable flywheel slippage will take place as power impulses are transmitted through the crankshaft. In this type of operation, the slippage is desirable since the acceleration and deceleration of the flywheel in the damper lessens the vibration amplitude, reducing its effect to a level harmless to the engine.
To determine if repair is possible or replacement is necessary, perform the following procedure. See Figure 21773 .
Flowchart for Repair or Replacement of Crankshaft Vibration Damper
Precleaning is not necessary.
Personal injury and/or engine damage may result from direct physical contact with the vibration damper of an operating engine. Damper damage, engine damage, or both may occur if tools or other objects strike or become lodged behind the damper during operation. Objects coming in contact with the damper of an operating engine also may be thrown off by the damper with force, becoming a dangerous projectile which could cause personal injury, property damage, or both.
Remove the crankshaft vibration damper as follows:
Inspect the vibration damper as follows:
Install the crankshaft vibration damper as follows: