# Service bulletin D20M6

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: 10178947
- Published by NHTSA: 2020\-08\-31
- Manufacturer's number: D20M6
- Manufacturer's date: 2020\-08\-14
- NHTSA component: ENGINE AND ENGINE COOLING

## NHTSA's summary

Detroit Diesel Field Service Campaign for DETROIT Reman Built HDEP Engines \- Incorrect Gear Train Bolt Torque. The gear train mounting bolts need to be checked for proper torque and adjusted as needed.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2020/MC-10178947-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2020/MC-10178947-9999.pdf)

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

## Components

Engine

## Vehicles listed

- 2014 to 2016 FREIGHTLINER CASCADIA
- 2020 FREIGHTLINER CASCADIA
- 2016 WESTERN STAR 4800
- 2017 WESTERN STAR 5700

## Recalls for the same vehicles and component

- [15V816000](/recalls/nhtsa/15V816000.md), 2015-12-07: ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:MANIFOLD/HEADER/MUFFLER/TAIL PIPE
- [2015484](/recalls/tc/2015484.md), 2015-10-16: Engine
- [15V620000](/recalls/nhtsa/15V620000.md), 2015-10-02: ELECTRICAL SYSTEM:IGNITION:MODULE; ENGINE AND ENGINE COOLING:ENGINE
- [14V680000](/recalls/nhtsa/14V680000.md), 2014-10-29: FUEL SYSTEM, OTHER:STORAGE:TANK ASSEMBLY; ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:MANIFOLD/HEADER/MUFFLER/TAIL PIPE
- [14V080000](/recalls/nhtsa/14V080000.md), 2014-02-21: ENGINE AND ENGINE COOLING:ENGINE

## Other bulletins for the same vehicles and component

- [FleetCom\_Heater Core](/bulletins/11027493.md), 2026-01-08, Other: ENGINE. Fleet Communications for Heater Core Plugging
- [FleetCom\_SS 3163\-FTL](/bulletins/11026453.md), 2025-12-06, Other: ENGINE. Fleet Communications for Power Steering Reservoir Fill Cap Venting
- [FleetCom\_Low Coolant](/bulletins/11026421.md), 2025-12-05, Other: ENGINE. Fleet Communications for Low Coolant Sensor
- [CXA\_10\_25\_Low Coolant](/bulletins/11024962.md), 2025-11-05, Other: ENGINE. CX Advocate for P4, WST X\-Series, DD Engines Low/Critical Low Coolant Warnings
- [CXA\_10\_25\_Conmet Oil Pan](/bulletins/11024958.md), 2025-11-05, Other: ENGINE. CX Advocate for ConMet Oil Pan Insert Additional Issues
- [CXA 3\_25\_NOx](/bulletins/11016309.md), 2025-04-02, Other: ENGINE. CX Advocate for NOx conversion low faults
- [CXA 2\_25\_Turbo Oil Drain](/bulletins/11014819.md), 2025-03-04, Other: ENGINE. CX Advocate for turbo oil drain cracking
- [CXA 2\_25\_NOx](/bulletins/11014818.md), 2025-03-04, Other: ENGINE. CX Advocate for NOx conversion low faults
- [MYCOM\_02102025\-1](/bulletins/11014786.md), 2025-03-04, Other: ENGINE. My Communications for Variable Speed Coolant Pump for DD13 Engines \- Cascadia/57X Only
- [TSB01\-001\-DDC](/bulletins/11014775.md), 2025-03-04, Service bulletin: ENGINE. Technical Service Bulletin for GHG17 and Newer DD Platform Heavy Duty Oil Pan Drain Plug Inserts

JSON: [/v1/bulletins/10178947](/v1/bulletins/10178947)

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