EXPERIENCED BLOWOUT AT SPEED OF APPROX 70 MPH ON I-75 NORTH OF MACON GEORGIA. VIBRATION NOTED PRIOR TO BLOWOUT BUT I ATTRIBUTED THAT SYMPTOM TO THE ROAD SURFACE AND NOT THE TIRE. TIRE TREAD SEPARATED CAUSING DAMAGE TO VEHICLE UNDERBODY AS TIRE REMANENTS STRUCK VEHICLE FORWARD AND TO THE REAR OF THE REAR AXLE. TIRE IS AVAILAB…
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EXPERIENCED BLOWOUT AT SPEED OF APPROX 70 MPH ON I-75 NORTH OF MACON GEORGIA. VIBRATION NOTED PRIOR TO BLOWOUT BUT I ATTRIBUTED THAT SYMPTOM TO THE ROAD SURFACE AND NOT THE TIRE. TIRE TREAD SEPARATED CAUSING DAMAGE TO VEHICLE UNDERBODY AS TIRE REMANENTS STRUCK VEHICLE FORWARD AND TO THE REAR OF THE REAR AXLE. TIRE IS AVAILABLE FOR ANALYSIS IF NECESSARY.*AK (DOT NUMBER: VDAT JAB TIRESIZE: P255 60R15)
THE LOCKING SCREW THAT RETAINS THE PINION SHAFT IN PLACE IN THE DIFFERENTIAL COULD COME LOOSE. THE PINION SHAFT TURNS THE GEARS INSIDE THE DIFFERENTIAL THAT ROTATE THE DRIVE AXLES AND REAR WHEELS. IF THE LOCKING SCREW COMES LOOSE, IT COULD DAMAGE OTHER COMPONENTS OR JAM IN THE GEARS. IF THE PINION SHAFT COMES LOOSE, THE REAR WHEELS MAY NO LONGER POWER THE VEHICLE.
Consequence & remedy
Consequence: Not supplied
Remedy: THE DEALER WILL REPLACE THE DIFFERENTIAL LOCK SCREW AT NO CHARGE.
ON THE INVOLVED VEHICLES, THE REAR BRAKE DRUM BALANCE WEIGHTS MAY INTERFERE WITH THE ALUMINUM WHEELS. THIS CONTACT COULD CAUSE THE WHEEL LUG NUTS TO LOOSEN, LEADING TO WHEEL STUD FAILURE. THIS COULD ALLOW SEPARATION OF THE WHEEL AND TIRE FROM THE VEHICLE.
Consequence & remedy
Consequence: Not supplied
Remedy: THE DEALER WILL INSPECT AND, IF NECESSARY, MODIFY THE REAR BRAKE DRUM BALANCE WEIGHTS WITHOUT CHARGE TO OWNER.
Model-level recall history does not show whether a particular VIN is affected or has received a repair. Check a VIN with NHTSA ↗
Status: closed (inferred from source dates) · Vehicle Speed Control:linkages
SUMMARY:SOME 1981-86 TRUCKS WITH 7.4L ENGINES AND CAST IRON EXHAUSTMANIFOLDS MAY EXPERIENCE A CONDITION WHERE AN EXHAUST LEAK DEVELOPSBETWEEN THE MANIFOLD AND THE CYLINDER HEAD MATING SURFACE CAUSING A NOISECONDITION. MOST OF THE REPORTS (AND ALL OF THE INJURIES AND THEMANIFOLD FIRE) ARE FROM THE P30 MOTORHOME CHASSIS.GM STATES THAT A WARPEDOR CRACKED MANIFOLD WOULD PERMIT SMALL AMOUNTS OF EXHAUST GAS LEAKAGEGENERALLY RESULTING IN NOTICEABLE NOISE AND FUMES.THE EXHAUST MANIFOLDSARE SUSCEPTIBLE TO EXTREME HEAT CONDITIONS (SUCH AS OPERATING UNDER SEVEREENGINE/VEHICULAR LOAD CONDITIONS AND HIGH AMBIENT TEMPERATURES).THEMOTORHOME APPLICATION IS PARTICULARLY SUSCEPTIBLE TO THIS ALLEGED DEFECTSINCE THE VEHICLE IS NEARLY ALWAYS AT OR NEAR THE GVWR OF THE VEHICLE.THEFEW NUMBER OF REPORTS RECEIVED BY ODI FOR A PROBLEM WHICH BEGAN 8 YEARS AGOSUGGESTS THAT THE DEFECT EITHER OCCURS INFREQUENTLY OR IS NOT PERCEIVED ASA SIGNIFICANT SAFETY HAZARD.THE SERVICE BULLETIN WAS ISSUED TO IDENTIFYTHE HIGH TEMPERATURE PROBLEM AND PROVIDE A REMEDY AGAINST REOCCURRENCE.===
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