1977 MACK RM Recalls (6)
- 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.
- Campaign:
- 78V210000 on 10/11/1979
- Component:
- Service brakes, air:antilock:interconnecting assembly(wiring)
- Manufactured:
- 09/30/1977 - 08/31/1978
- Affected:
- 19,370
- Defect:
- Delays of up to about 2 seconds may exist in the brake application times to the brakes on the bogie axles in the presence of certain types of wheel speed sensor signal discontinuities or distortions that may occur as a result of sensor wire failure. this constitutes a non-compliance to federal motor vehicle safety standard no. 121, "air brake systems".
- Correction:
- Dealer will install new wheel speed sensors that incorporate improved wiring and the present bogie anti-wheel lock system will be changed to an axle-to-axle system for improved reliability.
- Notes:
- Vehicle description: heavy trucks.system: service brakes; electrical wiring and connectors.consequences of defect: this delay in effective braking action could lead to anaccident under certain traffic conditions.
- Campaign:
- 77V173000 on 10/11/1979
- Component:
- Engine and engine cooling:cooling system:fan
- Affected:
- 48,000
- Defect:
- The flex blade fans on the involved vehicles may develop cracks in the laminated stiffener as a result of fatigue during operation. if such a condition exists and the cracks go undetected, continued operation could cause pieces of the stiffener to break off.
- Correction:
- Dealer will replace the original fan with a steel fixed blade fan, free of charge.
- Notes:
- Vehicle description: trucks equipped with six-cylinder engines.system: engine cooling; fan.consequences of defect: broken pieces can be propelled outside of the fanshroud and will present an immediate danger and possible injury to personsstanding nearby.note: prior to correction, vehicle should not be serviced with the hood raisedand the engine running.
- Campaign:
- 77V174000 on 10/11/1979
- Component:
- Seat belts:front:anchorage
- Affected:
- 6,591
- Defect:
- The involved vehicles do not conform to federal motor vehicle safety standard no. 209, "seatbelt assemblies". although the seatbelts in question performed marginally with respect to the 5000 lb. load requirement, additional testing confirmed that the anchor could fail, allowing either the anchor to slip over the hold-down nut or the anchor to separate into two pieces.
- Correction:
- Dealer will inspect and, if necessary, replace seat belt assemblies without charge to owner.
- Notes:
- Vehicle description: trucks.system: interior; seat belt anchorage assembly.consequences of defect: in the event of an accident, these seat belts may notadequately restrain passengers and serious injuries may result.
- Campaign:
- 77V205000 on 10/11/1979
- Component:
- Suspension:rear:springs:leaf spring assembly:hanger/bracket
- Manufactured:
- 04/30/1977 - 09/30/1977
- Affected:
- 7,400
- Defect:
- A deficiency exists in the welds securing the rear spring insulator bracket to the axle housing. this is due to improper positioning of the weld, in relationship to the bracket and axle housing. failure of the welds would cause separation of the spring insulator bracket and the axle housing, resulting in improper alignment of the affected axle.
- Correction:
- Dealer will reweld the insulator spring bracket at no cost to owner.
- Notes:
- Vehicle description: heavy trucks.system: suspension; tandem axle.consequences of defect: this condition could cause a loss of vehicle controland a vehicle accident.
- Campaign:
- 77V096000 on 10/11/1979
- Component:
- Wheels
- Affected:
- 825
- Defect:
- The front wheel rim clamp studs, installed on the involved vehicles, may not have been manufactured correctly, causing a brittle condition in the thread root area. the studs could eventually crack and break when wheel nuts are tightened to specifications.
- Correction:
- The dealer will replace all suspect front wheel studs, without charge to owner.
- Notes:
- Vehicle description: heavy trucks.system: wheels; studs.consequences of defect: wheel stud failure could cause a loosened tire assemblyand impaired vehicle control. failure of more than one stud could causeseparation of the tire and rim assembly, causing loss of vehicle control and anaccident.note: driver may be alerted to the condition by a wobble or vibration in theaffected wheel.
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