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Service bulletin T1979C

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 id10162943
Published by NHTSA2019-07-22
Manufacturer's numberT1979C
Manufacturer's date2019-06-14
NHTSA componentENGINE AND ENGINE COOLING

NHTSA's summary

This Temporary Repair Practice authorizes the inspection and replacement of all rocker levers on identified Engine Serial Numbers should any one rocker lever be found as failed. This is an update to a previously submitted communication.

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

Vehicles listed
CUMMINS ISC
CUMMINS ISL
CUMMINS L9

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