NHTSA recall 78V170000
Engine and engine cooling › Engine
Mack Rwl and 3 more
Reported Aug 8, 1978850 vehicles affectedMACK TRUCKS, INCORPORATED
The defect
The possibility exists that the aluminum engine rear support brackets may fail due to metal fatigue. This type of failure would allow the engine and transmission assembly to dislocate downward. This will result in throttle control loss with the engine operating continuously in the mid to upper range of the governed speed range.
The remedy
Dealer will inspect and, if necessary, replace aluminum support brackets with brackets made from ductile iron for increased strength.