855544018 Mercury SCREW

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PSP FOR TURBOCHARGER TURBINE WHEEL ON D11N TRACTORS; 776B TRACTORS; 777B TRUCKS; AND 3508 ENGINES (SPARE) - PS4394 - MAI LED US AND CANADA, CACO, COFA, CFEL, 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-68 A-40 AU-43 E-44 O-58 1052 PS4394 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 "PS4394" as Part Number, "7755" as Group Number, and "96" as Description Code. This Program cancels and replaces the January 12, 1988 Service Letter - PS4171, the January 13, 1988 Service Letter - PS4187, and the January 14, 1988 Service Letter - PS4175. All Affected Product previously repaired under any of these Programs should be considered under Group 2. Termination Date
April 30, 1991
Problem
The turbocharger turbine wheel blades may fail on certain D11N Tractors; 776B Tractors; 777B Trucks; and 3508 Engines (Spare).
Affected Product
Model Identification Number Group 1 - Before Or After Failure (7C1278, 7W9082, And 7W9083 Turbocharger Groups) D11N 74Z1-351, 353-356, 359-363, 383-385, 387, 388, 392, 395-405, 407, 410, 491, 504 776B 6JC1-66 777B 4YC1-469, 477, 482, 494 3NF1-8 3508 99W308, 493, 555, 556, 558,, 566, 590, 592, 618, 636, 637, 670, 677, 678, 702, 712, 719, 748, 778, 783, 784, 790, 797, 802, 808 All Affected Product previously repaired per the January 12, 1988 Service Letter - PS4171, the January 13, 1988 Service Letter - PS4187, or the January 14, 1988 Service Letter - PS4175 should be consider under Group 2. Group 2 - Before Or After Failure (9Y1488, And 9Y1489 Turbocharger Groups) D11N 74Z352, 357, 358, 364-382, 386, 389, 390, 391, 393, 394, 406, 408, 409, 411-702 776B 6JC167-78 777B 4YC470-476, 478-481, 483-493, 495-1132 3NF9-42 3508 99W836, 861, 882, 883, 900, 903, 905, 916, 921, 927, 959, 982, 989, 1005, 1031, 1033, 1036, 1037, 1053, 1059, 1071, 1084, 1087, 1095, 1100, 1101, 1137, 1187, 1190, 1192, 1199, 1200, 1240, 1241, 1275-1277, 1280, 1313, 1368, 1407, 1436, 1437, 1444, 1464, 1470, 1481, 1495, 1564, 1584, 1597, 1599, 1602, 1605, 1625, 1638, 1648, 1650-1653, 1695, 1696, 1699, 1714, 1718, 1724, 1730, 1731, 1735, 1738, 1754, 1766, 1770
Parts Needed
Quantities shown are per turbocharger. There are two turbochargers on D11N Tractors, 776B Tractors, 777B Trucks, and 3508 Engines (Spare). Group 1 And Group 2 - After Failure Only 1 - 0R6006 Turbocharger Assembly 2 - 5P5700 Seal 1 - 7M7273 Gasket 1 - 7N7559 Gasket 4 - 7N7628 Gasket 1 - 7N8875 Gasket Group 1 - Before Failure And If Not Repaired Under Programs PS4171, PS4187, or PS4175 1 - 0L1351 Bolt 1 - 5M2894 Washer 1 - 7M7273 Gasket-Turbocharger-Manifold 1 - 7N7559 Gasket 4 - 7N7628 Gasket 1 - 7N8875 Gasket 2 - 5P5700 Seal 1 - 7W1944 Retainer 1 - 9Y8270 Housing-Turbo 1 - 9Y8267 Cartridge Group 2 - Before Failure and