# Service bulletin T1979

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.

- Type: Service bulletin
- NHTSA id: 10129836
- Published by NHTSA: 2018\-03\-12
- Manufacturer's number: T1979
- Manufacturer's date: 2018\-01\-26
- NHTSA component: ENGINE

## NHTSA's summary

This Temporary Repair Practices authorizes the inspection and replacement of all the rocker lever assemblies on certain ISC, ISL, and L9 Series engines, should one rocker lever assembly be found as failed. If a fractured rocker lever ball is observed on any rocker lever, all six rocker lever assemblies \(containing all twelve individual intake and exhaust rocker levers\) must be replaced.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2018/MC-10129836-9999.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2018/MC-10129836-0001.pdf)

The document is the manufacturer's. This site does not hold it.

## Components

Engine

## Vehicles listed

- CUMMINS ISC
- CUMMINS ISL
- CUMMINS L9

JSON: [/v1/bulletins/10129836](/v1/bulletins/10129836)

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