VEHICLE SPEED CONTROL
FUEL INJECTION SYSTEM RECONFIGURATION TO COMPLY WITH ENGINE EMISSION STANDARDS CAUSE HIGHER ENGINE VIBRATION LEVELS WHICH LEAD TO EARLY WEAR AND COMPLETE FAILURE OF THE SECONDARY THROTTLE RETURN MECHANISM.
Remedy: A NEW PRODUCTION SECONDARY THROTTLE RETURN SYSTEM CONFIGURATION WILL BE INSTALLED.
39,777 vehicles affected
POWER TRAIN:DRIVELINE
THE DRIVESHAFT TO THE FRONT DRIVING AXLE IS SECURED TO A BRACKET USING TWO PILLOW BLOCKS. THESE BLOCKS ARE OF INSUFFICIENT STRENGTH TO SUPPORT THE DRIVESHAFT AND COULD FAIL.
Remedy: MACK WILL INSTALL THICKER PILLOW BLOCKS AND SUPPORT U-BOLTS.
130 vehicles affected
ENGINE AND ENGINE COOLING:COOLING SYSTEM:FAN
THE ENGINE COOLING FAN BLADES MAY BREAK DUE TO INADEQUATE BLADE STRENGTH AROUND THE RIVETS THAT ATTACH THE BLADES TO THE FAN SPIDER.
Remedy: AN IMPROVED FAN WILL BE INSTALLED ON THESE VEHICLES.
11,000 vehicles affected