Mack Rm 1977

Model Rm made in 1977 by Mack got 6 recalls. There were some recalls concerningengine and engine cooling, seat belts and service brakes, air.

Model 1977

Recalls


CampaignManufacturerManufacturing dateType# of units affectedDate Owner notified MfgRecall Initiated byManufacturers of recalled vehicles/productsReport Recieved DateRecord Creation DateRegulation Part NumberFMVSS Number
ENGINE AND ENGINE COOLING - COOLING SYSTEM - FAN
77V173000MACK TRUCKS, INCORPORATED V (Vehicle)4800003/23/1978ODIMACK TRUCKS, INC10/12/197710/12/1979
Defect SummaryThe 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.
Consequence Summary
Corrective SummaryDealer will replace the original fan with a steel fixed blade fan, free of charge.
NotesVehicle 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.
ENGINE AND ENGINE COOLING - ENGINE
79V133000MACK TRUCKS, INCORPORATEDfrom 02/01/1977 to 03/01/1979V (Vehicle)2300011/02/1979ODIMACK TRUCKS, INC05/31/197910/12/1979
Defect SummaryIn 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.
Consequence Summary
Corrective SummaryDealer 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.
NotesVehicle 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.
SEAT BELTS - FRONT - ANCHORAGE
77V174000MACK TRUCKS, INCORPORATED V (Vehicle)659108/23/1978MFRMACK TRUCKS, INC10/12/197710/12/1979571209
Defect SummaryThe 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.
Consequence Summary
Corrective SummaryDealer will inspect and, if necessary, replace seat belt assemblies without charge to owner.
NotesVehicle 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.
SERVICE BRAKES, AIR - ANTILOCK - INTERCONNECTING ASSEMBLY(WIRING)
78V210000MACK TRUCKS, INCORPORATEDfrom 10/01/1977 to 09/01/1978V (Vehicle)1937011/07/1978MFRMACK TRUCKS, INC10/03/197810/12/1979571121
Defect SummaryDelays 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.
Consequence Summary
Corrective SummaryDealer 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.
NotesVehicle 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.
SUSPENSION - REAR - SPRINGS - LEAF SPRING ASSEMBLY - HANGER/BRACKET
77V205000MACK TRUCKS, INCORPORATEDfrom 05/01/1977 to 10/01/1977V (Vehicle)740003/14/1978MFRMACK TRUCKS, INC11/21/197710/12/1979
Defect SummaryA 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.
Consequence Summary
Corrective SummaryDealer will reweld the insulator spring bracket at no cost to owner.
NotesVehicle description: heavy trucks.system: suspension; tandem axle.consequences of defect: this condition could cause a loss of vehicle controland a vehicle accident.
WHEELS
77V096000MACK TRUCKS, INCORPORATED V (Vehicle)82509/09/1977MFRMACK TRUCKS, INC06/17/197710/12/1979
Defect SummaryThe 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.
Consequence Summary
Corrective SummaryThe dealer will replace all suspect front wheel studs, without charge to owner.
NotesVehicle 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.