MACK U 1974: ENGINE AND ENGINE COOLING:COOLING SYSTEM:FAN
NHTSA Campaign ID Number: 77V173000
| Make | Model | Year |
|---|---|---|
| MACK | U | 1974 |
| Date Owners Notified | Date Received by ODI | Date Added to Database |
| 1978-03-23 | 1977-10-12 | 1979-10-12 |
Production Dates: 1974-10-01 - 1976-03-01
Manufacturers Involved: Mack Trucks, Inc.
Component: ENGINE AND ENGINE COOLING:COOLING SYSTEM:FAN
Potential Number Of Units Affected: 48000
Report Initiator: ODI ODI Report
THE FLEX BLADE FANS ON THE INVOLVED VEHICLES MAY DEVELOP CRACKS IN THE LAMINATED STIFFENER AS A RESULT OF FATIGUE DURING OPERATION. IF SUCH A CONDITION EXISTS AND THE CRACKS GO UNDETECTED, CONTINUED OPERATION COULD CAUSE PIECES OF THE STIFFENER TO BREAK OFF.
DEALER WILL REPLACE THE ORIGINAL FAN WITH A STEEL FIXED BLADE FAN, FREE OF CHARGE.
VEHICLE DESCRIPTION: TRUCKS EQUIPPED WITH SIX-CYLINDER ENGINES.SYSTEM: ENGINE COOLING; FAN.CONSEQUENCES OF DEFECT: BROKEN PIECES CAN BE PROPELLED OUTSIDE OF THE FANSHROUD AND WILL PRESENT AN IMMEDIATE DANGER AND POSSIBLE INJURY TO PERSONSSTANDING NEARBY.NOTE: PRIOR TO CORRECTION, VEHICLE SHOULD NOT BE SERVICED WITH THE HOOD RAISEDAND THE ENGINE RUNNING.
