NHTSA recall 79V133000
Engine and engine cooling › Engine
Mack DM and 14 more
Reported May 31, 197923,000 vehicles affectedMACK TRUCKS, INCORPORATEDBuilt Feb 1, 1977 – Mar 1, 1979
The defect
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 remedy
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.