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Service bulletin FSB 252-033

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 id10083167
Published by NHTSA2016-10-20
Manufacturer's numberFSB 252-033
Manufacturer's date2016-07-07
NHTSA componentENGINE AND ENGINE COOLING:EXHAUST SYSTEM; ENGINE

NHTSA's summary

EXHAUST HEAT SHIELD, INSTALLATION, MACK CHU AND CXU MODELS EQUIPPED WITH SLEEPER CAB AND WITHOUT SIDE AIR DEFLECTORS, BUILT BETWEEN MAY 5, 2014 AND MAY 16, 2016, DID NOT COME WITH LOWER EXHAUST ELBOW HEAT SHIELDS. IF THESE VEHICLES HAVE OR ARE LATER EQUIPPED WITH REAR PTO, THE OPERATOR MAY BE EXPOSED TO HIGH TEMPERATURE EXHAUST COMPONENTS.

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

Vehicles listed
MACK CHU2015 to 2017
MACK CXU2015 to 2017

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