1978 MACK R 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:
- 78V031000 on 10/11/1979
- Component:
- Suspension:multiple axle
- Manufactured:
- 02/28/1975 - 01/31/1978
- Affected:
- 33,000
- Defect:
- The tee bracket, which is mounted on the front axle of the bogie, may fail due to vibration brought on by road surface irregularities. bracket failure would leave the tee bracket unsupported and cause broken hose connector fittings. this would result in automatic application of the spring emergency brakes.
- Correction:
- The dealer will replace the defective bracket with a redesigned version.
- Notes:
- Vehicle description: trucks equipped with highway bogies.system: suspension; tee bracket.consequences of defect: automatic application of the spring emergency brakescould cause loss of vehicle control and an accident.
- Campaign:
- 79V082000 on 10/11/1979
- Component:
- Steering:wheel and handle bar
- Manufactured:
- 02/28/1977 - 10/31/1978
- Affected:
- 12,000
- Defect:
- An improper pinch bolt and nut may have been used in the clamping of the steering shaft to the steering gear input shaft. due to clamping force loads applied at the bolt, the nut could yield, resulting in looseness of the input shaft yoke. should this condition go unnoticed, spline wear could cause shaft separation.
- Correction:
- Vehicles will be inspected and, if necessary, the correct fasteners will be installed at no charge to owner.
- Notes:
- Vehicle description: heavy trucks.system: steering; steering shaft clamp bolt.consequences of defect: this defect could cause loss of vehicle control and avehicle accident.
- Campaign:
- 79V017000 on 10/11/1979
- Component:
- Suspension:multiple axle
- Manufactured:
- 12/31/1976 - 11/30/1978
- Affected:
- 4,000
- Defect:
- A casting deficiency exists in the lower section of the caps resulting in a reduction in the thickness of the material. failure of a cap can allow the end of the rear spring to detach from the axle housing.
- Correction:
- Dealer will inspect and, if necessary, replace any of the spring insulator caps found to be defective. this will be done at no cost to owner.
- Notes:
- Vehicle description: trucks, heavy.system: suspension; insulator cap.consequences of defect: loss of vehicle control can result and lead to avehicle accident.
- Campaign:
- 79V018000 on 10/11/1979
- Component:
- Suspension:rear:springs:leaf spring assembly:hanger/bracket
- Manufactured:
- 03/31/1978 - 05/31/1978
- Affected:
- 17
- Defect:
- The steel brackets on the suspension beam were found to be deficient due to excessive shrinkage and low mechanical properties. failure of one or both of these brackets could cause a separation of the axle housing from the suspension.
- Correction:
- The dealer will inspect and, if necessary, replace any suspect bogie spring insulator caps with new caps meeting the proper specifications at no cost to owner.
- Notes:
- Vehicle description: trucks, heavy.system: suspension; hanger brackets.consequences of defect: loss of vehicle control can result and lead to avehicle accident.
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