TIP GP-PENETRATION PLUS 2174893 - Caterpillar

Caterpillar: Confidential Yellow
PSP FOR FAILURES OF RETAINERS FOR THE GOVERNOR, FLYWEIGHT DOWELS ON CERTAIN 3406B TRUCK ENGINES - MAILED US AND CANADA, COF A, TRUCK TEPS, LIMITED COSA TRUCK TEPS, LIMITED COSA
  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.
U-78 AU-51 O-46.1 TT-7 1264, 1272 PS4229 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 "PS4229" as Part Number and "7755" as Group Number. Although products in the field are to be administered as described above, dealers should purge parts stock immediately. Termination Date
May 31, 1989
Problem
The retainers for the flyweight dowels in the automatic timing advance unit of the governor may fail on certain 3406B Truck Engines. The failures are the result of a peening action by the dowel.
Affected Product
Model Identification Number 3406B 4MG3600 - 14583
Parts Needed
2 - 9Y7450 Retainer 1 - 2W459 Gasket 4 - 1S5440 Dowel
Action Required
Parts Stock Remove all 7W1528 Retainers from parts stock. The 7W1528 Retainers can be identified by their silver color. The new 9Y7450 Retainers are bluish black. Affected Product Check the upper rear corner of the right side of the cylinder block for the marks "5TS". If the marks "5TS" are there the product has already been reworked. If the marks are not there, proceed. Replace the existing retainers and dowels in the automatic timing advance unit of the governor with the new parts. Tighten the 4B2049 Nut, which is inside the adjusting screw, to 2.5 N.m (20 +/- 2 lb in). Put 9S3263 Thread Lock on the 8C9034 Bolts and tighten them to 3.4 N.m (30 lb in). Install a new gasket. Verify that the dynamic timing is correct