Article 1280 - Identification of Correct Crankshaft Pulley Bolts Used in 289/302 CID Engines

TSB #85 - February 9, 1968
Regardless of Accessories to Prevent Bolt Breakage - (All Vehicles Built Prior to January 15, 1968 and Equipped with 289 and 302 CID Engines)

Customers may complain of alternator belt noise or whipping movements caused from looseness of the crankshaft pulley. This loose condition may be caused by improper bolt torque or incorrect bolt usage.

Vehicles with 289/302 CID series engines built prior to January 15, 1968 may have been built with the alternator adjusting bolt (381649-S2) installed incorrectly in place of the proper crankshaft pulley bolt (56140-S4) identified with a raised letter "F" in the middle of its head as illustrated in the comparative bolt figures. Proper bolt torque is 25-35 ft./lbs.