Whine, Whistle, Ringing Type Noise Heard From Front of Engine (Replace Crankshaft Harmonic Balancer)

This bulletin is being revised to add additional information in the Condition statement. Please discard Corporate Bulletin Number 05-06-01-013B (Section 06 - Engine Mechanical).

Some customers may comment on a whine, whistle, or ringing type noise from the front of the engine that increases in intensity as engine RPM increases. This noise is most audible standing in front of the vehicle with the hood opened.

A very faint engine whine noise heard at speeds of 0-48 km/h (0-30 mph) at 1000-2500 RPM may be caused by the primary camshaft drive chain. Refer to Corporate Bulletin Number 06-06-01-018 for more information about this type of noise.

This condition may be caused may by the harmonic balancer.

Important: If the vehicle is equipped with the V03/V92 Heavy Duty Cooling package, DO NOT replace the six spoke design crankshaft harmonic balancer. Continue with routine diagnosis to isolate the noise.

Refer to the above graphic illustration and inspect the crankshaft harmonic balancer for design type. After the inspection, if the vehicle was built with three spoke (1) design crankshaft harmonic balancer , replace the harmonic balancer with P/N 12597654. Refer to Crankshaft Balancer Removal, Cleaning and Inspection, and Installation in SI.

Refer to the above graphic illustration and if the vehicle was built with the NEW DESIGN six spoke (1) crankshaft harmonic balancer , DO NOT replace it. Continue on with routine diagnosis to isolate the noise.

For vehicles repaired under warranty, use: