13387A - SERVICE UPDATE (REVISED PART INFORMATION). THIS BULLETIN PROVIDES A SERVICE PROCEDURE TO PERFORM A DRIVE AUDIT ON CERTAIN VEHICLES, EQUIPPED WITH A 2.5L ENGINE (LCV/LKW) OR 2.0L ENGINE (LTG). A SMALL NUMBER OF ENGINES MAY DEVELOP A CRANKSHAFT BEARING NOISE CONDITION AT LOW MILEAGE. THE DRIVE AUDIT MUST BE COMPLETED BEFORE VEHICLE DELIVERY (AND IN ADDITION TO NORMAL PRE-DELIVERY INSPECTION ACTIVITIES) TO IDENTIFY VEHICLES WITH THE CONDITION. IF THE CONDITION IS FOUND, DEALERS ARE TO REPLACE THE ENGINE.
