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Service bulletin FSB 252-029

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 id10083815
Published by NHTSA2016-11-02
Manufacturer's numberFSB 252-029
Manufacturer's date2013-09-18
NHTSA componentENGINE; ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:MANIFOLD/HEADER/MUFFLER/TAIL PIPE

NHTSA's summary

SOME MACK LEU AND MRU VEHICLES EQUIPPED WITH THE CUMMINS ISL-G ENGINE BUILT BEFORE SEPTEMBER 16, 2013 MAY EXPERIENCE AN ISSUE WITH THE MUFFLER INLET PIPE FALLING OUT OF THE MUFFLER.

The document

No address for NHTSA's copy can be built for this communication. Ask the dealer for it by the manufacturer's number.

Components

Engine, Exhaust and emissions, Exhaust manifold, pipes and muffler

Vehicles listed
MACK MACK

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