PE03009 · PE
WHEELS Investigation
THE SUBJECT WHEEL (NEW FOR MY 2003) IS USED ON CROWN VICTORIA (CV) AND GRAND MARQUIS.COMPLAINT DATA INDICATES THAT WHEEL FAILURE AFFECTS PRIMARILY THE COMMERCIAL SPECIFICATION CV MODEL (POLICE AND TAXI) WHICH HAS UNIQUE DESIGN CHARACTERISTICS AND IS GENERALLY SUBJECTED TO HIGHER USAGE DEMANDS.DURING FORD'S ANALYSIS, IT WAS DETERMINED THAT CYCLIC BENDING MOMENT FATIGUE COULD CAUSE RIM CRACKS TO OCCUR IN THE HEAT AFFECTED ZONE ADJACENT TO THE CIRCUMFERENTIAL WELD.FORD IMPLEMENTED CHANGES IN WHEEL MANUFACTURE IN SEPTEMBER 2002 AND INTRODUCED A NEW WHEEL DESIGN WITH A THICKER RIM IN APRIL 2003.ODI FOUND EVIDENCE THAT INDICATED RAPID CRACK PROPOGATION MIGHT HAVE OCCURRED IN SEVEN WHEEL FAILURE INCIDENTS, TWO OF WHICH LEAD TO TIRE DEBEADING.FORD HAS ANNOUNCED THAT 29,946 COMMERCIAL SPEC CV VEHICLES, MANUFACTURED PRIOR TO THE SEPTEMBER CHANGE, WILL BE RECALLED TO HAVE THE APRIL 2003 DESIGN WHEEL INSTALLED.ODI WILL CONTINUE TO MONITOR FOR WHEEL FAILURES IN THE SUBJECT VEHICLES NOT COVERED BY THE RECALL.
EA03001 · EA
FUEL SYSTEM, GASOLINE:STORAGE:TANK ASSEMBLY Investigation
IN SEPTEMBER 2002, A FUEL CYLINDER IN A NATURAL GAS POWERED VEHICLE (NGV) EXPLODED DURING A FIRE.FORD AND VRTC TEST ENGINEERS JOINTLY EXAMINED THE INCIDENT VEHICLE AND REVIEWED TESTING TO DETERMINE WHETHER THE PERFORMANCE OF THE PRESSURE RELIEF VALVE (PRD) WAS PROPER.THE PURPOSE OF A PRD IS TO PROTECT A COMPRESSED NATURAL GAS TANK FROM OVERPRESSURE BY ALLOWING THE CNG TO VENT WHEN THE TEMPERATURE REACHES A SPECIFIC POINT.THE PRD WAS REMOVED FROM THE FAILED TANK AND SUBJECTED TO A YIELD TEMPERATURE DETERMINATION TEST. IT WAS CONCLUDED THAT A DIRECT FLAME (FROM THE INTERIOR OF THE VEHICLE) ONTO THE CYLINDER (LOCATED BEHIND THE REAR SEAT IN THE TRUNK)COMPROMISED THE HOOP STRENGTH OF THE NATURAL GAS CYLINDER, THUS ALLOWING THE CYLINDER TO FAIL PRIOR TO THE PRD RELEASING AT ITSDESIGNED TEMPERATURE.AS A RESULT OF THIS TESTING AND REVIEW OF THE INVOLVED VEHICLE, FORD HAS DEVELOPED AN INSULATOR TO INSULATE THE NATURAL GAS FUEL TANK FROM A LOCALLY DIRECTED FLAME PROJECTING FROM THE INTERIOR OF THE VEHICLE.INSULATORS WILL BE INSTALLED BEHIND THE BACK SEAT ON SUBJECT VEHICLES TO PREVENT FUTURE FAILURES OF THIS TYPE. FORD'S ACTION ADDRESSES THE CONCERNS OF ODI.THEREFORE, THIS INVESTIGATION IS CLOSED.
PE02071 · PE
FUEL SYSTEM, GASOLINE:STORAGE:TANK ASSEMBLY Investigation
AN EXPLOSION OF A COMPRESSED NATURAL GAS (CNG) TANK SHOULD NOT BE ABLE TO OCCUR, AS THE TANK IS FITTED WITH A PRESSURE RELIEF DEVICE (PRD). THIS PRD SHOULD RELEASE THE CNG IN THE TANK, PRIOR TO THE PRESSURE REACHING THE TANK BURST PRESSURE.THE PRD DID NOT RELEASE IN THE SUBJECT WISCONSIN POLICE CRUISER EXPLOSION.NHTSA HAS RECOVERED THE PRD VALVE FROM THE TANK THAT EXPLODED AND TESTING WILL BE NECESSARY TO ESTABLISH WHY THIS TANK SAFETY VALVE DID NOT RELEASE IN THE VERY HIGH TEMPERATURE FIRE THAT OCCURRED IN THE POLICE CRUISER.THERE IS ONLY THE SINGLE KNOWN EVENT, BUT DUE TO THE CATASTROPIC FORCE OF SUCH AN EXPLOSION AND THE POTENTIAL FOR INJURY AND LOSS OF LIFE, THIS INVESTIGATION IS BEING UPGRADED.