1978 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:

79V014000 on 10/11/1979

Component:

Visibility:defroster/defogger system:windshield:heater core

Manufactured:

02/28/1978 - 11/16/1978

Affected:

358

Defect:

A deficiency in the routing of the heater duct hose could allow the hose to rest against a terminal post of the accessory relay. vibration will eventually cause the terminal post to penetrate the hose fabric and short circuit the wire reinforcement and overload the circuit.

Correction:

Dealer will replace the portion of the existing hose that is closest to the accessory relay with an all-rubber hose.

Notes:

Vehicle description: trucks.system: electrical; heat duct hose.consequences of defect: due to a lack of circuit breaker protection, fire andloss of all electrical circuits, including headlights, can occur and possiblylead to a vehicle accident.

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