NHTSA Office of Defects Investigation
Service Query SQ00-016: WHEEL STUD AND NUT
- Closed
NHTSA's Office of Defects Investigation opened Service Query SQ00-016 on September 15, 2000 and closed it on December 6, 2001. NHTSA's investigations file lists the Ford Expedition and Navigator for it.
Updated daily from NHTSA's investigations file
Key facts
- NHTSA number
- SQ00-016 (also written SQ00016)
- Investigation type
- Service Query
- Status
- Closed December 6, 2001
- Opened
- Closed
- Vehicle or equipment manufacturer
- Ford Motor Company
- Component
- Wheels
- Vehicles and equipment
- Ford Expedition and Navigator
A recall appears here only when NHTSA's investigations file links one to the investigation; NHTSA's summary or record can name others.
NHTSA's summary
As NHTSA's Office of Defects Investigation wrote it for Service Query SQ00-016.
IN DECEMBER 1999, FORD ISSUED TECHNICAL SERVICE BULLETIN 99-26-3, ENTITLED INCREASED WHEEL NUT AND STUD SIZE-SERVICE TIP,FOR 2000 MODEL YEAR EXPEDITION, NAVIGATOR, AND CERTAIN F-150 VEHICLES, BUILT ON OR AFTER NOVEMBER 27, 1999.
THESE VEHICLES HAVE INCREASED WHEEL STUD AND NUT DIAMETERS FROM 12MM TO 14MM.THE WHEEL NUT TORQUE WAS INCREASED FROM 100 FT-LB. TO 150 FT-LB., RESPECTIVELY.ODI HAS RECEIVED THREE REPORTS OF WHEELS SEPARATING FROM 2000 MODEL YEAR EXPEDITION VEHICLES, INCLUDING TWO CRASHES.TWO ADDITIONAL REPORTS ALLEGE BROKEN STUDS AND/OR LOOSE WHEEL NUTS.LOOSE WHEEL NUTS CAN ALLOW THE WHEEL TO WOBBLE AND CAUSE WHEEL STUD BREAKAGE.THERE ARE NO SIMILAR ODI REPORTS ON 2000 MODEL YEAR LINCOLN NAVIGATOR VEHICLES.THE FAILURES APPEAR TO BE ATTRIBUTED TO IMPROPER WHEEL NUT TORQUE; HOWEVER, THERE IS NO EVIDENCE THAT THERE ARE TORQUE QUALITY DEFICIENCIES AT THE ASSEMBLY PLANTS.DUE TO THE MILEAGES THE INCIDENTS OCCURRED, IT IS MOST LIKELY THAT IMPROPER WHEEL NUT TORQUES WERE APPLIED DURING SERVICING, BECAUSE IN ALL CASES WHEN LOOSE WHEELS WERE RE-TORQUED TO A LEAST 100 FT-LB., THERE WERE NO FAILURE RE-OCCURRENCES.
Vehicles and equipment listed for this investigation
NHTSA's investigations file lists these vehicles and equipment for Service Query SQ00-016. 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
All Ford recallsWhat 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 SQ00-016
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.