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Service bulletin TechTalk23864

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

The communication, as NHTSA indexes it (as of 2026-10-19)
TypeService bulletin
NHTSA id10191762
Published by NHTSA2021-05-05
Manufacturer's numberTechTalk23864
Manufacturer's date2021-04-26
NHTSA componentEQUIPMENT; ENGINE AND ENGINE COOLING

NHTSA's summary

Tech Talk discussion on a belt stretch tool sent to service techs.

The document

The document is the manufacturer's. This site does not hold it. NHTSA files a document at one of these two addresses; we have not asked NHTSA which.

Components

Engine, Equipment and accessories

Vehicles listed
WESTERN STAR 47002021

Listing a model year does not mean every vehicle of it is concerned: the document says which.

Recalls for the same vehicles and component
22V3380002022-05-16. EQUIPMENT:OTHER:LABELS
20V6340002020-10-14. EQUIPMENT:OTHER:LABELS; TIRES
20V2110002020-04-10. EQUIPMENT:OTHER:LABELS

A recall listed here may apply to some of the same vehicles. Only the manufacturer can say whether it applies to one vehicle.

Other bulletins for the same vehicles and component
CXA 03_26_Surge Tank2026-04-02. Other. CX Advocate for discolored coolant surge tanks (24CSA-20)
CXA_10_25_Conmet Oil Pan2025-11-05. Other. CX Advocate for ConMet Oil Pan Insert Additional Issues
24CSA-19Rev2025-09-02. Other. Revised Customer Service Annoucement for No Trouble Found Heavy Duty Engine Product (HDEP) Oil Separator Leaks
CXA 3_25_NOx2025-04-02. Other. CX Advocate for NOx conversion low faults
CXA 2_25_NOx2025-03-04. Other. CX Advocate for NOx conversion low faults
CXA 1_16_NOx2025-01-29. Other. CX Advocate for NOx conversion low faults
WI24-0192024-12-04. Warranty extension. Warranty Information letter for Detroit Line or Line Seal, High Pressure Fuel Injector Standard Repair Time Updates
SS1023366-Detroit2024-11-06. Other. Service Solution for Detroit Successful Regen Reference for GHG17 DD Engines
24CSA-202024-11-06. Service bulletin. Customer Service Annoucement for Discolored Coolant Surge Tank on Heavy Duty Engine Product (HDEP)
24CSA-192024-11-06. Other. Customer Service Annoucement for Heavy-Duty Engine Product (HDEP) Oil Separator Leaks