# Service bulletin SIL17TR21

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: 10205141
- Published by NHTSA: 2021\-12\-20
- Manufacturer's number: SIL17TR21
- Manufacturer's date: 2021\-11\-19
- NHTSA component: EQUIPMENT; ENGINE AND ENGINE COOLING

## NHTSA's summary

Announces temporary change to compound used in O\-ring.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2021/MC-10205141-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2021/MC-10205141-9999.pdf)

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

## Components

Engine, Equipment and accessories

## Vehicles listed

- ALLISON TRANSMISSION

JSON: [/v1/bulletins/10205141](/v1/bulletins/10205141)

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