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Service bulletin TSB210204-051420

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.

The communication, as NHTSA indexes it (as of 2026-10-19)
TypeService bulletin
NHTSA id10198485
Published by NHTSA2021-06-28
Manufacturer's numberTSB210204-051420
Manufacturer's date2021-05-14
NHTSA componentENGINE

NHTSA's summary

This Technical Service Bulletin describes the verification and resolution of an external lubricating oil leak from the crankcase breather tube. This can be caused by debris from valve cover manufacturing process can plug the lubricating oil separator breather system, preventing lubricating oil from draining back to the crankcase.

The document

The document is the manufacturer's. This site does not hold it. NHTSA files a document at one of these two addresses; we have not asked NHTSA which.

Components

Engine

Vehicles listed
CUMMINS L9

Listing a model year does not mean every vehicle of it is concerned: the document says which.