# Service bulletin TT7693EN

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: 10156697
- Published by NHTSA: 2019\-04\-08
- Manufacturer's number: TT7693EN
- Manufacturer's date: 2015\-08\-24
- NHTSA component: ENGINE AND ENGINE COOLING; POWER TRAIN:AUTOMATIC TRANSMISSION; EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL

## NHTSA's summary

Tech Tip for diagnosing and remedying C3/C4 bonded piston issue

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2015/MC-10156697-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2015/MC-10156697-9999.pdf)

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

## Components

Engine, Equipment and accessories, Labels and manuals, Transmission and driveline, Automatic transmission

## Vehicles listed

- ALLISON 3000 SERIES TRANSMISSION
- ALLISON B300
- ALLISON B400
- ALLISON T SERIES

JSON: [/v1/bulletins/10156697](/v1/bulletins/10156697)

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