NHTSA Office of Defects Investigation

Engineering Analysis EA04-034: FRACTURE OF THE STEEL WHEEL RIM

Closed

NHTSA's Office of Defects Investigation opened Engineering Analysis EA04-034 on December 21, 2004 and closed it on March 8, 2007. NHTSA's investigations file lists the 2003–2005 Ford Cvpi for it and links recall 07V-079 to it.

Updated daily from NHTSA's investigations file

Key facts

NHTSA number: EA04-034 (also written EA04034)
Investigation type: Engineering Analysis A more detailed stage of a defect investigation, opened when NHTSA's Office of Defects Investigation decides an issue merits further review, often after a Preliminary Evaluation or a Recall Query; it can include vehicle testing, surveys and further information requests.
Status: Closed March 8, 2007
Opened: December 21, 2004
Closed: March 8, 2007
Vehicle or equipment manufacturer: Ford Motor Company
Components: Wheels; Wheels — Rim
Recall linked by NHTSA: 07V-079: STEEL WHEELS, reported March 6, 2007
Vehicles and equipment: 2003–2005 Ford Cvpi

NHTSA's summary

As NHTSA's Office of Defects Investigation wrote it for Engineering Analysis EA04-034.

try.vin does not copy NHTSA's investigation documents; NHTSA's investigation record lists the ones NHTSA has published.

FRACTURE (CRACKING) OF THE SUBJECT VEHICLE (SV) WHEEL, WHICH WAS PREVIOUSLY INVESTIGATED UNDER PRELIMINARY EVALUATION PE03-009 (SAFETY RECALL 03V-279), OCCURS IN THE MODEL YEAR (MY) 2003 TO 2005 POLICE INTERCEPTOR VEHICLES ONLY; CIVILIAN SPECIFICATION AND OTHER MY VEHICLES ARE UNAFFECTED BY THIS CONDITION.FOR THE AFFECTED SUBJECT WHEELS, A FATIGUE CRACK OCCURS IN THE HEAT AFFECTED ZONE OF THE RIM MATERIAL ADJACENT TO THE CIRCUMFERENTIAL WELD THAT ATTACHES THE RIM TO THE OUTBOARD WHEEL DISC.THE CRACK INITIATES UNDER THE OUTBOARD TIRE BEAD NEAR THE HEEL (WHERE AIR LEAKAGE CANNOT BE ASSURED) AND SUBSEQUENTLY GROWS CIRCUMFERENTIALLY THROUGH CYCLIC BENDING AS THE WHEELS ROLLS.ALTHOUGH THE VAST MAJORITY OF RIM CRACKS EITHER PRESENTED NO SYMPTOMS OR WERE DETECTED SAFELY VIA RECURRING SLOW AIR LEAKAGE, ODI IDENTIFIED 6 INCIDENTS WHERE RAPID AIR LEAKAGE LEADING TO A FULL OR PARTIAL DEFLATION OF THE TIRE WAS ALLEGED.FOR THESE WHEELS, EVIDENCE INDICATED THAT MULTIPLE CRACKS HAD FORMED IN DIFFERENT AREAS OF THE RIM AND SUBSEQUENTLY GROWN TOGETHER.TWO OF THE INCIDENTS RESULTED IN A CRASH, ONE DURING A HIGH SPEED PURSUIT.ALTHOUGH THE MINORITY OF CASES, FORD?S ASSESSMENTS OF FIELD RETURN WHEELS SHOWED THAT MULTIPLE CRACKS EXIST IN APPROXIMATELY 17 PERCENT OF THE CRACKED WHEELS REPLACED UNDER A FORD EXTENDED WARRANTY PROGRAM.IN A WHEEL WITH MULTIPLE CRACKS, AS THE AREA BETWEEN THE CRACKS IS REDUCED BY GROWTH A HIGH STRESS CONDITION (SUCH AS WOULD OCCUR IN AN AGGRESSIVE VEHICLE MANEUVER DURING A HIGH-SPEED PURSUIT) MAY CAUSE THE CRACKS TO JOIN TOGETHER RAPIDLY.IF THE CRACKS ARE OF SUFFICIENT SIZE, THE STRUCTURAL INTEGRITY OF THE RIM MAY BE COMPROMISED RESULTING IN RAPID AIR LOSS AND RIM DEFORMATION.FOR POLICE VEHICLES USED AT HIGH SPEED, RAPID DEFLATION AND LOSS OF RIM STRUCTURAL INTEGRITY AFFECTS VEHICLE CONTROL AND MAY INCREASE THE RISK OF A CRASH.FATIGUE IS THE FUNDAMENTAL FRACTURE MECHANISM; THEREFORE, WHEEL FRACTURE CAN BE EXPECTED TO OCCUR (AND AT AN INCREASED INCIDENCE LEVEL) AS LONG AS THE AFFECTED WHEELS REMAIN IN SERVICE.IN DECEMBER 2004 (WITHIN MY 2005 SV PRODUCTION) FORD INTRODUCED A SHOT PEEN PROCESS INTO THE MANUFACTURE OF SV WHEELS.SHOT PEEN WHEELS, WHICH ARE IDENTIFIED BY UNIQUE PART NUMBER STAMPINGS, HAVE NOT EXHIBITED FRACTURE IN POLICE SERVICE TO DATE.UNDER 07V-079, FORD WILL INSPECT SVS REGISTERED FOR POLICE USE AND REPLACE EARLIER DESIGN LEVEL WHEELS WITH SHOT PEEN WHEELS.POLICE AGENCIES SHOULD BE ADVISED THAT MY 2005 VEHICLES BUILT AFTER DECEMBER 2004 ARE NOT WITHIN THE SCOPE OF THIS RECALL (SINCE THEY WERE ORIGINALLY MANUFACTURED WITH SHOT PEEN WHEELS).

AGENCIES SHOULD BE DILIGENT IN ENSURING THAT NON-SHOT PEEN WHEELS ARE REMOVED FROM OUT-OF-SCOPE VEHICLES OR OTHER WHEEL SUPPLY INVENTORIES.

Vehicles and equipment listed for this investigation

NHTSA's investigations file lists these vehicles and equipment for Engineering Analysis EA04-034. A listed model year means only that an investigation names it; it says nothing about any particular vehicle. Model years with a try.vin recall page link to that page's NHTSA investigations section.

Ford

Ford Cvpi
- 2003, 2004, 2005

All Ford recalls

What an NHTSA investigation is

NHTSA's Office of Defects Investigation (ODI) looks into possible safety defects in vehicles and equipment, often after owner complaints. An investigation usually starts as a Preliminary Evaluation, or as a Recall Query when it concerns whether an existing recall covers the right vehicles or fixes the problem, and ODI can upgrade it to a more detailed Engineering Analysis. A Defect Petition asks NHTSA to open an investigation, and Audit and Equipment Queries are administrative investigations into whether companies complied with federal vehicle safety requirements, such as reporting, recall and certification rules.

An open investigation is not a finding that a safety defect exists, and NHTSA can close one without a recall.

To see whether a specific vehicle has an open recall, enter its VIN at nhtsa.gov/recalls.

Ford VIN check: decode a VIN to see its year, make and model.

Sources

NHTSA's investigation record for EA04-034

Investigation details come from NHTSA's investigations file, which try.vin imports once a day. The investigation types are described from the U.S. Department of Transportation Inspector General's May 2023 report on NHTSA's Office of Defects Investigation, NHTSA's petition rules (49 CFR Parts 552 and 557) and NHTSA's Office of Defects Investigation procedures. How try.vin reads NHTSA investigations.