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Service bulletin 18506

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 id10014676
Published by NHTSA2005-05-05
Manufacturer's number18506
Manufacturer's date2005-03-01
NHTSA componentWHEELS

NHTSA's summary

ALUMINUM ALLOY WHEELS PITTING AND OR PEELING CLEANING PROCEDURES. *EH

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

Wheels

Vehicles listed
FORD EXPEDITION2003, 2004
LINCOLN NAVIGATOR2003, 2004

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

Other bulletins for the same vehicles and component
TSB 24-21882024-07-29. Service bulletin. This article supersedes TSB 22-2219 to update the Parts List and Service Procedure to clarify applicable steps by vehicle application. Some 2003-2020 Expedition/Navigator and 2006-2020 F-150 (non-Raptor) vehicles equipped with 4WD may exhibit grinding/clicking/ratcheting noise from the front wheel area. This may be due to partial engagement of the integrated wheel ends (IWE). To correct this condition, follow the Service Procedure to remove and cap the vacuum supply line or to reprogram the transfer case control module (TCCM) and replace any worn vacuum and/or IWE components.
TSB 20-23072020-11-05. Service bulletin. Some 2003-2020 Expedition/Navigator and 2006-2020 F-150 vehicles equipped with TOD transfer cases may exhibit grinding/clicking/ratcheting noise from the front wheel area. This may be due to partial engagement of the integrated wheel ends (IWE). To correct this condition, follow the Service Procedure steps to remove and cap the vacuum supply line.
0526242006-01-25. Service bulletin. VIBRATION DIAGNOSIS - TIRE/WHEEL RUNOUT. *TT
992632004-07-23. Service bulletin. CORRECT LUG NUT TORQUE SPECIFICATIONS - INCREASE WHEEL NUT AND STUD SIZE - SERVICE TIP. *TT