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Service bulletin TSB220227

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 id10235516
Published by NHTSA2023-05-04
Manufacturer's numberTSB220227
Manufacturer's date2023-04-24
NHTSA componentENGINE AND ENGINE COOLING

NHTSA's summary

This Technical Service Bulletin describes the verification and resolution of External lubricating oil leak issue that can occur at the tappet guide screw by an updated screw installation procedure. This is an update to the previously submitted communication.

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 ISC8.3
CUMMINS ISL
CUMMINS ISL 9
CUMMINS L9

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