Investigations

SEPARATED FRONT SUSPENSION

NHTSA Preliminary Evaluation PE96052 - closed, opened 1996-08-23.

PE96052 Preliminary Evaluation Closed

NHTSA investigation PE96052 is a Preliminary Evaluation opened on 1996-08-23 and currently closed. The subject is tracked inside the Office of Defects Investigation queue. Latest activity on this investigation was logged on 1997-01-27 - NHTSA updates that field whenever an Information Request goes out, a supplement is filed, or a status change is recorded in the public docket.

A Preliminary Evaluation like PE96052 is the entry point of the federal defect-investigation process. NHTSA engineers scan complaint databases, field reports, and manufacturer data to decide whether an Engineering Analysis is warranted, whether a voluntary recall is already sufficient, or whether the pattern does not rise to a defect finding.

Investigators summarized the matter as follows: "CONSUMER COMPLAINTS REPORT THAT BOLTS WHICH RETAIN THE AXLE PIVOT BRACKET TO THE FRAME CROSS MEMBER CAN LOOSEN OR FAIL, CAUSING THE INBOARD END OR THE AXLE TO BECOME DETACHED FROM THE VEHICLE. OWNERS ALLEGE THAT THIS COU..." Investigations are the early-warning layer of the federal auto-safety system, sitting upstream of formal recalls and defect orders. Whether this one closes without action or escalates into an Engineering Analysis, the full history stays in the ODI archive so researchers, litigators, and buyers can pull the paper trail at any time.

Status
Closed
Type
Preliminary Evaluation
Opened
1996-08-23
Latest Activity
1997-01-27

Investigation Summary

CONSUMER COMPLAINTS REPORT THAT BOLTS WHICH RETAIN THE AXLE PIVOT BRACKET TO THE FRAME CROSS MEMBER CAN LOOSEN OR FAIL, CAUSING THE INBOARD END OR THE AXLE TO BECOME DETACHED FROM THE VEHICLE. OWNERS ALLEGE THAT THIS COULD RESULT IN LOSS OF STEERING CONTROL, HOWEVER THE COMPLAINT DATA SHOWS ONLY ONE INCIDENT WHERE THE VEHICLE LEFT THE ROADWAY FOLLOWING AXLE SEPARATION, WITH NO DAMAGE TO THE VEHICLE. IN ADDITION TO THE 225 CONSUMER COMPLAINTS, THERE WERE 4,315 WARRANTY CLAIMS RELATED TO THE FRONT SUSPENSION AND MEMBERS, AND 22 VEHICLES WERE REPLACED FOR "GOODWILL." DOCUMENTS SUBMITTED BY FORD, UNDER REQUEST FOR CONFIDENTIAL TREATMENT INDICATE THAT THE BOLTS WERE INADEQUATE FOR THE DURABILITY REQUIREMENTS OF THE VEHICLE. ALSO, BOLTS WERE FOUND TO HAVE BEEN INADEQUATELY TORQUED AT ONE OR MORE ASSEMBLY PLANTS. OTHER FACTORS, SUCH AS WAX TREATMENT OF THE FRAME, CONTRIBUTED TO THE PROBLEM. INCREASED BOLT DIAMETER AND INCREASED TORQUE APPARENTLY CORRECTED THE PROBLEM. A SERVICE BULLETIN, 96-20-13, WAS ISSUED TO ADVISE DEALERS OF THIS CORRECTIVE ACTION. IN THESE DOCUMENTS, FORD ALSO REPORTED THAT A VEHICLE, EQUIPPED FOR SIMULTANEOUS CATASTROPHIC FAILURE OF ALL PIVOT BRACKET FASTENERS, WAS EVALUATED RESULTING IN A "SLIGHT VEHICLE PULL TO ONE SIDE WITH NO LOSS OF VEHICLE CONTROL." ODI HAS NOT REPLICATED FORD'S VEHICLE TESTING, HOWEVER ANALYSIS OF THE DESIGN OF THE FRONT SUSPENSION INDICATES THAT EVEN IF THE INBOARD END OF THE AXLE BECAME DISCONNECTED FROM THE FRAME, THE OUTBOARD END WOULD REMAIN FIRMLY ATTACHED TO THE LEAF SPRING WITH TWO U-BOLTS. THIS WOULD RETAIN THE WHEEL IN ITS APPROXIMATE POSITION, ALTHOUGH THE WHEEL ALIGNMENT WOULD BE GREATLY IN ERROR. THEREFORE IT IS UNLIKELY THAT CONTROL OF THE VEHICLE WOULD BE LOST. OWNERS REPROT MANY SIGNIFICANT NOISES IN THE SUSPENSION, SUCH AS CREAKING, GROANING, CLUNKING, AND SQUEAKING, PRIOR TO NOTICING ANY SEPARATION OF THE AXLE. THIS PROVIDES WARNING OF THE LOOSENING OF THE BOLTS TO THE DRIVER, AND SHOULD NOT BE IGNORED. FORD

About This Investigation Type

A Preliminary Evaluation (PE) is the first phase of NHTSA's investigation process. It is opened when the agency identifies a potential safety defect pattern, usually triggered by consumer complaints, manufacturer reports, or field monitoring. During a PE, NHTSA gathers information to determine whether a formal engineering analysis is warranted.

Data from NHTSA Office of Defects Investigation. Cross-references: NHTSA recall campaign API and NHTSA FARS where fatality records overlap. PlainCars does not rate or recommend vehicles. about how PlainCars sources NHTSA data.