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Service bulletin NO.B51

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 id603381
Published by NHTSA1999-02-19
Manufacturer's numberNO.B51
Manufacturer's date1998-07-06
NHTSA componentENGINE AND ENGINE COOLING:ENGINE

NHTSA's summary

A NEW STYLE MAIN BEARING CAP BOLT WAS PHASED INTO MIDR 06.02.26ENGINE PRODUCTION. *YC

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

Vehicles listed
MACK MIDLINER1998 to 1999

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