87-397-2 September 1999 Bearings, Part 2: OE Service Bulletins Ford: Added protection for bearings To protect the DE bearing in 3G Series alternators, Ford made a running change in the DE frames, and carried this change over to the 4G and 6G as well. They added a raised collar around the bearing opening in the DE frame, which then required a pulley with a cut-out that would fit over this collar. The point of this modification is to prevent debris from attacking the bearing seal (Figure /). Note that the pulleys from the early-style units were not cut out and will not fit on the revised DE frame. Figure 1. Ford added a raised collar on the D.E. frame of 3G series alter- nators to protect the bear- ing. The pulley was modi- fied to accommodate the collar. Ford truck bearing problem Ford TSB (Technical Service Bulletin) #95-17-13 covers a concern with the DE bearing in Motorcraft 95-amp 3G Series alternators that were used on FD1060/1460 engines in vehicles built before 7/3/95. This DE bearing seems to be wearing out prema- turely because of the force of the main drive-belt load. A revised alternator 1-1997-11FD (F5PZ-10346-GA) has a 24mm-wide DE bearing, which improves the handling of the force produced by the main drive-belt load. This alternator uses a 21-225 DE Frame, bearing 10-3032-4 and 24-2265 pulley. If you are building these alternators, you need to use all three of these parts along with the other standard 3G parts if you want to avoid warranty returns (Figure 2). Figure 2. To prevent premature bearing failure in 3G alter- nators used on medium and heavy trucks, Ford started using a 24mm-wide bearing. DE frame and pulley were modified to accommodate the bearing. All three must be used together when rebuilding these particular alternators. CS130: Change to bearing & DE frame In March 1994 GM issued Service Bulletin #366402, concerning improvements to CS130 series alternators. The bulletin covered CS130 units used on the following vehicles: 1990 – 94 Chevrolet & GMC P3 Models, all engines 1992 – 93 Chevrolet & GMC M/L/G Vans & S/T trucks with 4.3L engines (VIN’s W and Z – RPOs yj Wil Wetherill Associates, Inc. * 1101 Enterprise Drive * Royersford, PA 19468 +* 800-877-3340 Care is taken to ensure the accuracy of information presented here, but Wetherill Associates, Inc., assumes no responsibility for possible errors. Copyright © 1999 Wetherill Associates, Inc. 6475 Technical Update 44 page 2 L35 and LB4) 1992 – 94 Chevrolet & GMC C/K, all engines 1992 – 93 Oldsmobile Bravada According to this bulletin, beginning in 1994, all CS130 alternators used in the applications noted above would be produced with a larger 6303 DE bearing plus a steel cooling fan on the rotor. In addition, all new CS130 service units intended for use on the 1992-93 vehicles on this list would be produced with 6303 bear- ings, and all of GM’s remanufactured units for these vehicles would also be built to the 1994 specifications using the larger bearing. As a result of this change, DE frames for these CS130 units also had to be changed to accommodate the larger bearing. See Table I below for a complete list of superses- sions in the service units and the corresponding DE frames. Also see the conversion chart on page 3 for further clarification on changes to these DE frames. continued on page 4 Table 1.CS130 Unit and DE frame supersessions to accommodate 6303 bearing Units w/ 6203 bearings superseded to Units w/ 6303 bearings DE DE OE Service WAIR # Frame OE Service WAIR # Frame Unit # Unit # 6203 Unit # Unit # 6303 1101111 | 10463002 | 1-1629-34DR | 21-124 10480086 | 10463417 | 1-1766-33DR | 21-146 1101293 | 10463110 | 1-1629-21DR | 21-124 10480094 | 10463424 | 1-1766-22DR | 21-146 1101318 | 10463111 | 1-1629-21DR | 21-124 10480084 | 10463415 | 1-1766-22DR | 21-146 1101346 | 10463049 | 1-1250-34DR | 21-123 None 10463621 | None 21-145 1101500 | 10463146 | 1-1629-11DR | 21-124 10480082 | 10463413 | 1-1766-12DR | 21-146 1101571 | 10463140 | 1-1652-31DR | 21-118 10480088 | 10463419 | 1-1903-31DR | 21-149 1101617 | 10463146 | 1-1629-11DR | 21-124 10480082 | 10463413 | 1-1766-12DR | 21-146 1101618 | 10463049 | 1-1625-34DR | 21-123 None 10463621 | None 21-145 1101619 | 10463105 | 1-1640-11DR | 21-118 None 10463414 | None 21-149 1101620 | 10463111 | 1-1629-21DR | 21-124 10480084 | 10463415 | 1-1766-22DR | 21-146 1101621 | 10463039 | 1-1640-11DR | 21-118 10480085 | 10463416 | 1-1895-11DR | 21-149 1101629 | 10463110 | 1-1629-21DR | 21-124 10480094 | 10463424 | 1-1766-22DR | 21-146 1101633 | 10463002 | 1-1629-34DR | 21-124 10480086 | 10463417 | 1-1766-33DR | 21-146 1101635 | 10463159 | 1-1640-35DR | 21-118 10480092 | 10463423 | 1-1895-13DR | 21-149 1101636 | 10463180 | 1-1640-35DR | 21-118 10480092 | 10463423 | 1-1895-13DR | 21-149 1101637 | 10463445 | 1-1629-11DR | 21-124 10480087 | 10463418 | 1-1766-12DR | 21-146 1101806 | 10463183 | 1-1652-32DR | 21-118 None 10463420 | None 21-149 1101807 | 10463048 | 1-1640-32DR | 21-118 10480090 | 10463421 | 1-1895-32DR | 21-149 1102630 | 10463159 | 1-1640-35DR | 21-118 10480092 | 10463423 | 1-1895-13DR | 21-149 1102631 | 10463180 | 1-1640-35DR | 21-118 10480092 | 10463423 | 1-1895-13DR | 21-149 1105688 | 10463039 | 1-1640-11DR | 21-118 10480085 | 10463416 | 1-1895-11DR | 21-149 1105716 | 10463105 | 1-1640-11DR | 21-118 None 10463414 | None 21-149 1105720 | 10463048 | 1-1640-32DR | 21-118 10480090 | 10463421 | 1-1895-32DR | 21-149 1105722 | 10463049 | 1-1250-34DR | 21-123 None 10463621 | None 21-145 10479802 | 10463245 | 1-1622-21DR | 21-124 10480094 | 10463424 | 1-1766-22DR | 21-146 10479883 | 10463140 | 1-1640-31DR | 21-118 10480091 | 10463422 | 1-1895-31DR | 21-149 10479974 | 10463367 | 1-1625-12DR | 21-123 None 10463622 | None 21-145 10479997 | 10463368 | 1-1629-34DR | 21-124 10480099 | 10463425 1-1766-33DR | 21-146