Defect summary
THE HOOK SIZE OF THE THROTTLE RETURN SPRING IS TOO SMALL RESULTING IN A TIGHT FIT AROUND THE ANCHOR NUT, CAUSING THE THROTTLE RETURN SPRING TO BREAK PREMATURELY.
Consequence
IF THE THROTTLE SPRING BREAKS, THE ENGINE WILL RETURN TO IDLE SPEED, WHICH MAY CAUSE A HIGHWAY HAZARD AND RESULT IN A VEHICLE CRASH.
Remedy
INSTALL THROTTLE RETURN SPRINGS WITH LARGER HOOKS.
Notes
SYSTEM: THROTTLE RETURN SPRINGS.VEHICLE DESCRIPTION: HEAVY TRUCKS WITH CUMMINS B SERIES ENGINES.
Source: NHTSA ODI recalls file, campaign 91V177000. Text as published by NHTSA.