COUPLING AS- 3971944 - Caterpillar

IDENTIFICATION
Many engines have already been reworked. Check the serial number of your engine. If it is in the 7FB1-7FB06809 range, the flyweight shield may not have been removed yet. If you have an engine with an affected serial number and you are not sure if the flyweight shield has been removed, contact the closest Caterpillar dealer. He will inspect the governor housing and quickly tell you if the flyweight shield has been removed. If the flyweight shield has not been removed, a convenient time can be scheduled by the dealer to have this done. The rework takes approximately three hours to complete.