MACK WL 1978: ENGINE AND ENGINE COOLING:ENGINE

General Information

NHTSA Campaign ID Number: 78V170000

Make Model Year
MACK WL 1978
Date Owners Notified Date Received by ODI Date Added to Database
1978-12-04 1978-08-08 1979-10-12

Production Dates: 1977-02-01 - 1979-03-01

Manufacturers Involved: Mack Trucks, Inc.

Component: ENGINE AND ENGINE COOLING:ENGINE

Potential Number Of Units Affected: 850

Report Initiator: MFR MFR Report

Summary

THE POSSIBILITY EXISTS THAT THE ALUMINUM ENGINE REAR SUPPORT BRACKETS MAY FAIL DUE TO METAL FATIGUE. THIS TYPE OF FAILURE WOULD ALLOW THE ENGINE AND TRANSMISSION ASSEMBLY TO DISLOCATE DOWNWARD. THIS WILL RESULT IN THROTTLE CONTROL LOSS WITH THE ENGINE OPERATING CONTINUOUSLY IN THE MID TO UPPER RANGE OF THE GOVERNED SPEED RANGE.

Remedy

DEALER WILL INSPECT AND, IF NECESSARY, REPLACE ALUMINUM SUPPORT BRACKETS WITH BRACKETS MADE FROM DUCTILE IRON FOR INCREASED STRENGTH.

Notes

VEHICLE DESCRIPTION: TRUCKS.SYSTEM: ENGINE; ENGINE MOUNTING BRACKET.CONSEQUENCES OF DEFECT: LOSS OF THROTTLE CONTROL MAY RESULT IN LOSS OF VEHICLECONTROL AND AN ACCIDENT.