# Service bulletin T1979A

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: 10141329
- Published by NHTSA: 2018\-06\-18
- Manufacturer's number: T1979A
- Manufacturer's date: 2018\-05\-18
- NHTSA component: EQUIPMENT ADAPTIVE/MOBILITY; EQUIPMENT; ENGINE AND ENGINE COOLING

## 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. This is an update to a previous commmunication.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2018/MC-10141329-9999.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2018/MC-10141329-0001.pdf)

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

## Components

Engine, Equipment and accessories

## Vehicles listed

- CUMMINS ISC
- CUMMINS ISL
- CUMMINS L9

JSON: [/v1/bulletins/10141329](/v1/bulletins/10141329)

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