Inspect Engine Torsional Damper

IMPORTANT: Do not immerse the torsional damper in cleaning solvent or any petroleum product. Rubber portion of damper may be damaged.

Never apply thrust on outer ring. Damper is sensitive to impact damage, such as being dropped or struck with a hammer.

The damper assembly is not repairable. Replace damper every five years or 4500 hours, whichever occurs first. Also, replace damper whenever crankshaft is replaced or after major engine overhaul.

1. Grasp outer ring of damper and attempt to turn it in both directions. If rotation is felt, damper is defective and should be replaced. Also, if rubber is separated, partially missing, or displaced, replace damper.

RG7507

Engine Shown Removed for Clarity of Photo

CED,OUO1079,172 -19-13APR00-1/2

2. Check torsional damper radial runout by positioning a dial indicator so probe contacts damper OD.

3. With engine at operating temperature, rotate crankshaft using engine rotation tool.

4. Note dial indicator reading. If runout exceeds specifications given below, replace torsional damper.

Specification

Engine Torsional Damper -Radial Runout 1.50 mm (0.060 in.)

RG7508

CED,OUO1079,172 -19-13APR00-2/2