The issue
TRUCKS EQUIPPED WITH MACK 6 CYLINDER ENGINES AND FLEXIBLE BLADE ENGINE COOLING FANS. THE FLEXIBLE BLADE FANS MAY DEVELOP FATIGUE CRACKS IN THE LAMINATED STIFFENER. CONTINUED ENGINE OPERATION COULD CAUSE A PIECE OF THE STIFFENER TO BREAK OFF AND BE PROPELLED OUTSIDE OF THE FAN SHROUD. A PROPELLED FRAGMENT COULD CAUSE INJURY TO SERVICE PERSONNEL IN THE VICINITY OF AN OPERATING ENGINE.
Transport Canada Vehicle Recalls Database · Contains information licensed under the Open Government Licence – Canada · official text, unchanged
Vehicles covered
| Make and model | Model years |
|---|---|
| Mack CF | 1972, 1973, 1974, 1975, 1976, 1977 |
| Mack DM | 1972, 1973, 1974, 1975, 1976, 1977 |
| Mack DMM | 1972, 1973, 1974, 1975, 1976, 1977 |
| Mack F | 1972, 1973, 1974, 1975, 1976, 1977 |
| Mack FL | 1972, 1973, 1974, 1975, 1976, 1977 |
| Mack FS | 1972, 1973, 1974, 1975, 1976, 1977 |
| Mack HMM | 1972, 1973, 1974, 1975, 1976, 1977 |
| Mack R | 1972, 1973, 1974, 1975, 1976, 1977 |
| Mack RD | 1972, 1973, 1974, 1975, 1976, 1977 |
| Mack RL | 1972, 1973, 1974, 1975, 1976, 1977 |
| Mack RM | 1972, 1973, 1974, 1975, 1976, 1977 |
| Mack RS | 1972, 1973, 1974, 1975, 1976, 1977 |
| Mack U | 1972, 1973, 1974, 1975, 1976, 1977 |
| Mack WL | 1972, 1973, 1974, 1975, 1976, 1977 |
| Mack WS | 1972, 1973, 1974, 1975, 1976, 1977 |