1979 MACK MC Recalls (2)

Campaign:

79V133000 on 10/11/1979

Component:

Engine and engine cooling:engine

Manufactured:

01/31/1977 - 02/28/1979

Affected:

23,000

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.

Correction:

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.

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Campaign:

79V171000 on 10/11/1979

Component:

Suspension:rear:springs:leaf spring assembly

Affected:

1,706

Defect:

The spring seat plate, located between the axle housing and the suspension springs, may deform due to spring bending. as a result, the clamping force in the assembly may be reduced. loss of clamping force could cause spring failure and the axle will dislocate. also, the tire could come into contact with the spring.

Correction:

The dealer will replace the existing spring seat with a newly fabricated seat which is welded to the housing. an improved spring clamping plate and new springs will also be installed without charge.

Notes:

Vehicle description: trucks.system: suspension; rear axle assembly.consequences of defect: loss of vehicle control and an accident could resultdue to dislocation of axle and tire to spring interference.

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