NHTSA Office of Defects Investigation
Preliminary Evaluation PE04-062: TIE ROD TUBE FAILURE
- Closed
NHTSA's Office of Defects Investigation opened Preliminary Evaluation PE04-062 on September 3, 2004 and closed it on February 2, 2005. NHTSA's investigations file lists 3 models from 2 makes for it.
Updated daily from NHTSA's investigations file
Key facts
- NHTSA number
- PE04-062 (also written PE04062)
- Investigation type
- Preliminary Evaluation The first stage of most defect investigations: NHTSA's Office of Defects Investigation gathers basic information about a possible safety defect, including from the manufacturer.
- Status
- Closed February 2, 2005
- Opened
- Closed
- Vehicle or equipment manufacturers
- THOMAS BUILT BUSES, INC.; FREIGHTLINER LLC
- Component
- Steering — Linkages — Tie Rod Assembly
- Vehicles and equipment
- 3 models from 2 makes, including the Thomas MVP EF and Thomas MVP ER
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 Preliminary Evaluation PE04-062.
try.vin does not copy NHTSA's investigation documents; NHTSA's investigation record lists the ones NHTSA has published.
THIS INVESTIGATION WAS PROMPTED BY COMPLAINTS FROM TWO SEPARATE SCHOOL BUSFLEETS.BOTH FLEETS ALLEGED THAT WHILE MANEUVERING IN A PARKING AREA, THE TIE-ROD TUBE DISCONNECTED FROM ONE OF THE TIE-RODS.DANA, FREIGHTLINER AND THOMAS BUILT BUSES RECENTLY COMPLETED EXTENSIVE TESING AND DETERMINED THAT A CRACK MAY INITIATE ON THE INTERNAL THREAD ROOT OF THE TIE ROD.THIS CONDITION IS DUE TO INADEQUATE DAMPENING IN THE CHASSIS SYSTEM TO ACCOUNT FOR NORMAL BRAKE-INDUCED VIBRATION.THESE CRACKS MAY LEAD TO SEPARATION OF THE TIE ROD FROM THE ASSEMBLY.APPROXIMATELY 5,839 DANA STEER AXLES EQUIPPED WITH A CERTAIN TRW TIE ROD ASSEMBLY UTILIZING A CUT THREAD DESIGN ARE INVOLVED:A.1320 AXLE APPLICATIONS, THOMAS PART NUMBER 61110702 AND 61110705 INSTALLED ON THOMAS BUSES WITH 6" BRAKES AND 30" AIR CHAMBERS;B.1460 AXLE APPLICATIONS, THOMAS BUS PART NUMBER 61110707 AND 61110708 INSTALLED WITH 6" BRAKES AND 30" AIR CHAMBERS. THOMAS BUILT BUS WILL REPLACE THE EXISTING TIE ROD ASSEMBLIES WHICH CONTAIN THE CUT THREAD DESIGN WITH A NEW TIE ROD ASSEMBLY THAT UTILIZES A ROLLED THREAD DESIGN.A ROLLED THREAD PROVIDES LESS STRESS ON THE CRITICAL AREA OF THE TIE ROD. A COPY OF THE DEFECT REPORT IS ATTACHED. THIS ACTION RESOLVES THE ISSUES RAISED BY THIS INVESTIGATION.ACCORDINGLY,THIS INVESTIGATION IS CLOSED.
Vehicles and equipment listed for this investigation
NHTSA's investigations file lists these vehicles and equipment for Preliminary Evaluation PE04-062. 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.
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.
Free VIN check: decode a VIN to see its year, make and model.
Sources
NHTSA's investigation record for PE04-062
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.