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NHTSA ID Number: 10193467
Manufacturer Communication Number: PIP5742A
Summary
This Preliminary information communicates to the dealer technicians that a belt chirp or rubbing noise may be caused by the harmonic balancer out ring moving backward on the pulley and contacting the front cover.
10 Affected Products
Vehicles
| MAKE | MODEL | YEAR |
| CHEVROLET | SILVERADO 1500 | 2019-2020 |
| CHEVROLET | SILVERADO 4500HD | 2019-2020 |
| CHEVROLET | SILVERADO 5500HD | 2019-2020 |
| CHEVROLET | SILVERADO 6500HD | 2019-2020 |
| GMC | SIERRA 1500 | 2019-2020 |
Condition:
A customer concern may be of a belt chirp noise and/or metal to metal noise.
Cause:
The outer ring of the harmonic balancer may slide backward and cause a misalignment of the belt. The outer ring may slide back far enough to contact the timing cover and oil pan(s).
Correction:
Inspect the harmonic balancer, timing cover and oil pans. Replace as needed.
SEOCONTENT-START
Bulletin No.: PIP5742A Published date: 04/22/2021
Preliminary Information
PIP5742A Belt Chirp Noise and-or Harmonic Balancer Rubbing on Timing Cover
Models
Brand:
Silverado HD Sierra HD
Model:
Model Years:
2019 – 2020
2019 – 2020
VIN:
from to
All All
All All
6.6 L5P
6.6 L5P
Transmissions:
All All
Silverado 4500HD, 5500HD, 6500HD
2019 – 2020
All
All
6.6 L5D
All
Involved Region or Country: Condition:
Cause:
North America
A customer concern may be of a belt chirp noise and/or metal to metal noise. The outer ring of the
harmonic balancer may slide backward and cause a misalignment of the belt. The outer ring may slide
back far enough to contact the timing cover and oil pan(s).
Correction:
Inspect the harmonic balancer, timing cover and oil pans. Replace as needed. See images below for
examples.
Harmonic balancer damage due to contact.
Separation of the harmonic balancer’s inner and outer rings.
The new damper has a hub that is longer than the inertia ring. Movement can be identified by
inspecting the hub directly at the elastomer. Look for a witness mark of where the elastomer was
originally positioned.
Damage to the timing cover and upper oil pan.
Damage to the timing cover and upper oil pan.
Service Procedure:
Refer to service information for proper procedures.
Warranty Information
For vehicles repaired under the Powertrain coverage, use the following labor operation. Reference
the Applicable Warranties section of Investigate Vehicle History (IVH) for coverage information.
Labor Operation: Description:
Labor Time:
4063290 Crankshaft Pulley Replacement
Use Published Labor Times
4063610 Engine Front Cover Replacement Use
Published Labor Times
4065910 Lower Oil Pan Replacement
Use Published Labor Times
4065890 Upper Oil Pan Replacement
Use Published Labor Times
Version History
Version 2
06/23/2020 – Created on.
Modified
04/22/2021 – Updated to replace Labor Op 4063250 with 4063290.
SEOCONTENT-END
1 Associated Document
Manufacturer Communications
Bulletin No.: PIP5742A
Published date: 04/22/2021
MC-10193467-9999.pdf 1093.464KB
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