Recall 79V-133: 1977–1979 Mack DM, 1977–1979 Mack DMM and 13 more
MACK TRUCKS, INCORPORATED recall for engine and engine cooling, reported to NHTSA on May 31, 1979, covering about 23,000 vehicles.
The problem
In the event of turbocharger compressor wheel failure, one or more of the four capscrews that hold the turbocharger together may be struck by parts of the compressor wheel, resulting in the capscrews being damaged. If these capscrews are damaged to the point that they allow the compressor back plate to dislocate from the turbocharger bearing housing, engine lubricating oil may be allowed to escape under pressure, contacting the engine exhaust manifold sections or turbocharger turbine housing.
The fix
Dealer will install a shield for the heads of the four capscrews, along with stronger SAE 8 grade 8 capscrews, if necessary, at no cost to owner.
Notes
Vehicle description: trucks equipped with endt (B) 676, etaz (B) 673a, and etay(B) 673a engines.system: engine and engine cooling.consequences of defect: engine lubricating oil, in the presence of a source ofignition, could lead to an engine compartment fire and serious injury tovehicle passengers.
Recall details
| Manufacturer | MACK TRUCKS, INCORPORATED |
|---|---|
| Component | Engine and Engine Cooling › Engine |
| Recall started by | NHTSA (Office of Defects Investigation) |
| NHTSA campaign number | 79V133000 |
Vehicles in this recall
| Vehicle | Model years | |
|---|---|---|
| Mack DM | 1977, 1978, 1979 | All years |
| Mack DMM | 1977, 1978, 1979 | All years |
| Mack F | 1977, 1978, 1979 | All years |
| Mack MC | 1977, 1978, 1979 | All years |
| Mack MR | 1977, 1978, 1979 | All years |
| Mack R | 1977, 1978, 1979 | All years |
| Mack RD | 1977, 1978, 1979 | All years |
| Mack RL | 1977, 1978, 1979 | All years |
| Mack RM | 1977, 1978, 1979 | All years |
| Mack RS | 1977, 1978, 1979 | All years |
| Mack RWL | 1978, 1979 | All years |
| Mack RWS | 1977, 1978, 1979 | All years |
| Mack U | 1977, 1978, 1979 | All years |
| Mack WL | 1977, 1978, 1979 | All years |
| Mack WS | 1977, 1978, 1979 | 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 79V-133?
In the event of turbocharger compressor wheel failure, one or more of the four capscrews that hold the turbocharger together may be struck by parts of the compressor wheel, resulting in the capscrews being damaged. If these capscrews are damaged to the point that they allow the compressor back plate to dislocate from the turbocharger bearing housing, engine lubricating oil may be allowed to escape under pressure, contacting the engine exhaust manifold sections or turbocharger turbine housing.
How is recall 79V-133 fixed?
Dealer will install a shield for the heads of the four capscrews, along with stronger SAE 8 grade 8 capscrews, if necessary, at no cost to owner.
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.