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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 id10055987
Published by NHTSA2014-08-08
Manufacturer's numberFSB-252-029
Manufacturer's date2014-05-01
NHTSA componentENGINE AND ENGINE COOLING:EXHAUST SYSTEM:MANIFOLD/HEADER/MUFFLER/TAIL PIPE

NHTSA's summary

MACK TRUCK: MUFFLER INLET PIPE WILL FALL OUT, AND A NEW MUFFLER INLET PIPE, TURBORCHARGER OUTLET PIPE, LENGTHENED EXHAUST FLEX PIPE WAS DESIGNED TO ADDRESS THIS CONDITION AND WORK TOGETHER TO REDUCE RIGIDITY. *PE

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 MRU2007 to 2013

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