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NHTSA Campaign 78V170000

ENGINE AND ENGINE COOLING:ENGINE

Issued by MACK TRUCKS, INCORPORATED · Reported Aug 8, 1978 · 850 vehicles affected

What's wrong

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.

Vehicles affected by this recall

Make Model Year Units
MACK RWL 1975 850
MACK RWL 1976 850
MACK RWL 1977 850
MACK RWL 1978 850
MACK RWS 1975 850
MACK RWS 1976 850
MACK RWS 1977 850
MACK RWS 1978 850
MACK WL 1975 850
MACK WL 1976 850
MACK WL 1977 850
MACK WL 1978 850
MACK WS 1975 850
MACK WS 1976 850
MACK WS 1977 850
MACK WS 1978 850

Source: NHTSA Campaign 78V170000 on nhtsa.gov. To check the current repair status for a specific vehicle, use our free VIN decoder.