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PSP FOR DAMAGED BOLTS IN GOVERNOR FLYWEIGHT CARRIER AND AUTO TIMING ADVANCE UNITS IN 3406B INDUSTRY, MARINE, GEN SET AND TRU CK ENGINES - MAILED TRUCK TEPS, AGRICULTURE TEPS AND MARINE TEPS
  The information supplied in this service letter may not be valid after the termination date of this program.   Do not perform the work outlined in this Service Letter after the termination date without first contacting your Caterpillar product analyst.
TT-9 TA-2 TM-2 1264, 1272 PS4224 This Program can be administered either before or after a failure. In either case the decision whether to apply the Program is made by the dealer. When reporting the repair, use "PS4224" as Part Number and "7755" as Group Number. Although products are to be administered as described above, parts stock should be purged immediately. Termination Date
May 31, 1989
Problem
Some 1S5440 Dowels were made with a chamfer on the ends instead of a radius. These dowels are used in certain governor groups and automatic timing advance units. The chamfered dowels may damage the threads of the bolts in the governor flyweight retainer and in the automatic timing advance units.
Affected Product
Model Identification Number Automatic Timing Advance Units Only 3406B 7FB86679 - 95381 2WB4651 - 4919 4TB1106 - 1216 6TB3856 - 4072 Automatic Timing Advance Units And Governors 3406B 7FB95382 - 99999 4MG1 - 3599 2WB4920 - 5353 4TB1217 - 1399 6TB4073 - 4467 Governors Only 3406B 4MG3600 - 10013
Parts Needed
Parts Stock To rework the following: 2W6179 Pump Group 1N3110 Governor Group 2W7325 Governor Group 4W1628 Governor Group 7C1677 Governor Group 7C4797 Governor Group 7C6576 Governor Group 8N9682 Governor Group 4W2427 Pump and Governor Gp. 4W3897 Pump and Governor Gp. 7C183 Pump and Governor Gp. 8N9675 Pump and Governor Gp. 4 - 9Y7037 Bolt 1 - 335879 Ring 4 - 1S5440 Dowel 1 - 8N9382 Gasket 1 - 4W435 Seal 1 - 8N9384 Gasket 1 - 8M8515 Seal To rework the following: 2W6174 Camshaft As.,9L4990 Weight As. 4 - 9Y7037 Bolt 4 - 1S5440 Dowel Affected Product Automatic Timing Advance Units Only 4 - 1S5440 Dowel 4 - 8T7893 Bolt 1 - 4W435 Seal 1 - 4W4616 Seal 1 - 2W459 Gasket Automatic Timing Advance Units And Governors 4 - 9Y7037 Bolt 1 - 335879 Ring 8 - 1S5440 Dowel 4 - 8T7893 Bolt 1 - 8N9382 Gasket 1 - 4W435 Seal 1 - 8N9384 Gasket 1 - 4W4616 Seal 1 - 8M8515 Seal 1 - 2W459 Gasket Governors Only 4 - 9Y7037 Bolt 1 - 335879 Ring 4 - 1S5440 Dowel 1 - 8N9384 Gasket 1 - 8N9382 Gasket 1 - 8M8515 Seal
Action Required
Parts Stock Check all 1S5440 Dowels in parts stock. Remove all 1S5440 Dowels that have a chamfer on the ends. 1S5440 Dowels with a radius on the ends are good. See the Illustrations. Remove all 1S5440 Dowels from the following groups and assemblies and install new 1S5440 Dowels. Category 1 2W6179 Pump Group 1N3110 Governor Group 2W7325 Governor Group 4W1628 Governor Group 7C1677 Governor Group 7C4797 Governor Group 7C6576 Governor Group 8N9682 Governor Group 2W6174 Camshaft As. 9L4990 Weight As. Category 2 4W2427 Pump and Governor Gp. 4W3897 Pump and Governor Gp. 7C183 Pump and Governor Gp. 8N9675 Pump and Governor Gp. ****** IMAGE: SEBE3819.00001.001 CAPTION: Chamfered End ****** IMAGE: SEBE3819.00001.002 CAPTION: Radius End Affected Product Check the upper rear corner of the right side of the cylinder block for the code "5AX" or "5A". If the code is there, the product has already been reworked. If the code is not there, the product needs to