Recall 77V-173: 1972–1977 Mack CF, 1972–1977 Mack DM and 12 more
MACK TRUCKS, INCORPORATED recall for engine and engine cooling, reported to NHTSA on Oct 12, 1977, covering about 48,000 vehicles.
The problem
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.
The fix
Dealer will replace the original fan with a steel fixed blade fan, free of charge.
Notes
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.
Recall details
| Manufacturer | MACK TRUCKS, INCORPORATED |
|---|---|
| Component | Engine and Engine Cooling › Cooling System › Fan |
| Recall started by | NHTSA (Office of Defects Investigation) |
| NHTSA campaign number | 77V173000 |
Vehicles in this recall
| Vehicle | Model years | |
|---|---|---|
| Mack CF | 1972, 1973, 1974, 1975, 1976, 1977 | All years |
| Mack DM | 1972, 1973, 1974, 1975, 1976, 1977 | All years |
| Mack DMM | 1972, 1973, 1974, 1975, 1976, 1977 | All years |
| Mack F | 1972, 1973, 1974, 1975, 1976, 1977 | All years |
| Mack FL | 1972, 1973, 1974, 1975, 1976, 1977 | All years |
| Mack FS | 1972, 1973, 1974, 1975, 1976, 1977 | All years |
| Mack HMM | 1972, 1973, 1974, 1975, 1976, 1977 | All years |
| Mack R | 1972, 1973, 1974, 1975, 1976, 1977 | All years |
| Mack RD | 1972, 1973, 1974, 1975, 1976, 1977 | All years |
| Mack RL | 1972, 1973, 1974, 1975, 1976, 1977 | All years |
| Mack RM | 1972, 1973, 1974, 1975, 1976, 1977 | All years |
| Mack U | 1972, 1973, 1974, 1975, 1976, 1977 | All years |
| Mack WL | 1972, 1973, 1974, 1975, 1976, 1977 | All years |
| Mack WS | 1972, 1973, 1974, 1975, 1976, 1977 | All years |
Not every vehicle of these model years is included. Enter your VIN at nhtsa.gov/recalls ↗ or ask a dealer.
Frequently asked questions
What is recall 77V-173?
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.
How is recall 77V-173 fixed?
Dealer will replace the original fan with a steel fixed blade fan, free of charge.
Is the recall repair free?
Yes. Safety recall repairs are free at authorized dealers. Check whether your vehicle is included with its VIN at nhtsa.gov/recalls.