NHTSA ID Number: 11031976
Manufacturer Communication Number: WI26-004
TSB/Document Date: 2026-05-02
Summary
Warranty Information letter for Detroit Standard Repair Time Updates – Gen 5 Heavy-Duty Engines
WARRANTY DEPARTMENT
6121 N Cutter Circle, Suite A
Portland, Oregon 97217-4090
For questions, comments, or to submit an
Daimler Truck North America inquiry, go to: DTNA Portal > WSC
Please distribute to:
Dealer Principal, Warranty Manager, Service Manager, Parts Manager, Sales Manager
MI Freightliner
Dealers 1 Western Star Dealers M DDC Distributors
MI FCCC Dealers M1 Direct Warranty Customers © Sales Terms (DTR)
MI Thomas Built Bus Dealers M Export © Used Product (DTR)
WARRANTY INFORMATION LETTER
No. WI26-xxx
Release 4/20/2026
Effective 5/18/2026
Subject Detroit Standard Repair Time Updates — Gen 5 Heavy-Duty Engines
“+ Overview | The Service Methods and Warranty teams recently reviewed Standard Repair Times (SRTs),
historical claim data, and time study data for the Gen 5 DD15 heavy-duty engine. As a result, for
Gen 5 DD15 heavy-duty engines, the SRTs listed below are being adjusted. The updated SRTs will
be applied to repair orders opened on or after May 18, 2026.
e HARNESS, ATS WIRING, R/R (SRT 246-6130E)
e ADJUSTING SCREW, ROCKER ARM, INTAKE, R/R (SRT 101-6802A)
“+ Updated e AIR COMPRESSOR, R/R WITH STEAM CLEAN AND ROAD TEST (SRT 107-6929E)
SRTs e OIL SEAL, CRANKSHAFT, REAR, R/R, INCLUDES TRANSMISSION, WITH STEAM CLEAN
AND ROAD TEST (SRT 101-6330E)
e FLYWHEEL, R/R, INCLUDES TRANSMISSION WITH ROAD TEST (SRT 101-6400B)
The tables below identify the impacted labor, chassis service models, engine series, and times.
Any questions regarding SRTs may be submitted through the PRISM Network Assistant (PNA).
Chassis r
Labor Description Ss ry Service Engine Current | Updated
Code Series Hours Hours
Model
Use for replacement of the
SRT 246- | HARNESS, ATS wiRING, | “ftettreatment System (ATS)
harness. See workshop 0.7 0.9
6130E RR . .
manual for detailed repair
procedures.
Use for replacement of one or
SRT101. | ADJUSTING SCREW, multiple intake rocker arm
68024 ROCKER ARM, INTAKE, | adjustment screws. See 3.1 3.5
RR workshop manual for detailed
repair procedure.
AIR COMPRESSOR. RR Use for replacement of the air ALL GEN
SRT 107- compressor assembly. See ALL
6929E WITH STEAM CLEAN vorkst | for detailed | CHASSIS | 5 DD15 4.3 3.9
AND ROAD TEST workshop manual for detaile MODELS | ENGINES
repair procedures.
OIL SEAL,
CRANKSHAFT, REAR, Use for replacement of the
SRT 101- R/R, INCLUDES rear crankshaft oil seal. See 84 8
6330E TRANSMISSION, WITH workshop manual for detailed :
STEAM CLEAN AND repair procedure.
ROAD TEST
FLYWHEEL, R/R, Use for replacement of the
SRT 101- INCLUDES flywheel. See workshop 82 79
6400B TRANSMISSION WITH manual for detailed repair : .
ROAD TEST procedure.
Verify latest version online; access Warranty Information Letters at DTNA Portal > Warranty Literature > Letters.
Note: The information in this letter becomes effective on the date noted above and supersedes and/or supplements policies and procedures in the DTINA
Warranty Manual and/or previously released letters with respect to the subject matter of this letter. When information reflects pending changes to the
Warranty Manual, after revision, to the extent there is a conflict between the Warranty Manual and this letter, the Warranty Manual controls.
Warranty Information Letter
No.: WI26-0%
Revised: 3/30/26
Copyright © Daimler Truck North America LLC. All rights reserved.
Daimler Truck North America LLC is a Daimler Truck company.
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TSB/Document ID: WI26-004
Replacement Service Bulletin Number:
MFR Communication Date: 2026-04-20
MFR Internal Campaign ID/Software Version:
Communication Type: Other
NHTSA Components: ENGINE
MFR Component System:
MFR Component Subsystem:
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