1979 MACK RWL Recalls (6)
- Campaign:
- 79V130000 on 10/11/1979
- Component:
- Steering:wheel and handle bar
- Manufactured:
- 10/31/1977 - 03/31/1979
- Affected:
- 2,187
- Defect:
- It has been determined that two screws that are part of the bearing assembly located at the cab dash sheet may not have been tightened properly. as a result, the upper steering shaft may be free to "float" throughout much of its length which may result in inadequate engagement in the slip splines of the lower steering shaft. axle articulation could result in disengagement of the lower steering shaft slip splines.
- Correction:
- Dealer will install a sleeve between the dash sheet bearing and the upper steering shaft lower yoke to assure positive upper steering shaft location.
- Notes:
- Vehicle description: trucks.system: steering assembly; steering column shaft, upper.consequences of defect: loss of steering control could cause loss of vehiclecontrol and an accident.
- 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:
- 79V137000 on 10/11/1979
- Component:
- Steering:linkages
- Manufactured:
- 04/30/1977 - 03/31/1979
- Affected:
- 6,673
- Defect:
- The pitman arm retaining nut may not have been torqued to manufacturer specifications. this could result in inadequate retention of the nut at the output shaft, allowing the pitman arm to become loose.
- Correction:
- Dealer will inspect and retorque pitman arm, if necessary, at no cost to owner.
- Notes:
- Vehicle description: trucks.system: steering linkages; arm, pitman.consequences of defect: this condition could lead to premature wearing of theoutput shaft causing loss of vehicle control and an accident.
- 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.
- Campaign:
- 79V164000 on 10/11/1979
- Component:
- Steering:wheel and handle bar
- Manufactured:
- 10/31/1978 - 05/31/1979
- Affected:
- 4,640
- Defect:
- The flange head pinch bolts used in the yokes of the steering shaft assemblies may have been overstressed due to the bolts not being tightened to specifications. as a result, the pinch bolts could break while in service.
- Correction:
- Flange head pinch bolts will be replaced with standard grade 8 fasteners without charge to owner.
- Notes:
- Vehicle description: trucks.system: steering; flange head pinch bolts.consequences of defect: if breakage occurs, loss of steering control and avehicle accident could occur.
- Campaign:
- 83V121000 on 12/06/1983
- Component:
- Steering:gear box:shaft pitman
- Manufactured:
- 12/31/1977 - 02/28/1979
- Affected:
- 1,377
- Defect:
- Mounting of the pitman arm may loosen and lead to excessive wear in either the pitman arm splines or the steering gear shaft splines, or both. this condition is due to incorrect tightening of the mounting screws during assembly.
- Correction:
- The dealer will inspect and properly tighten the pitman arm retaining screws.
- Notes:
- Vehicle description: heavy trucks.system: steering; pitman arm.consequences of defect: looseness in the steering linkage may result in loss ofsteering control and the possibility of a vehicle accident.
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