HARNESS AS-WIRING 1591188 - Caterpillar

This Revised Service Letter replaces the January 12, 1989 Service Letter. Changes have been made to the Affected Product, Parts Needed, Action Required, and Service Claim Allowances.
Problem
The turbocharger oil lines may crack and allow oil to leak into the vee of the engine between the heat shields and exhaust manifolds on some D11N Tractors; 776B Tractors; 777B and 785 Trucks; and 3508 and 3512 Engines.
Affected Product
Check the list of identification numbers under both Group A and Group B. Some of the Affected Product are included in both groups. When possible, all applicable portions of this Program should be administered at the same time.
Model & Identification Number
Group A - Turbocharger Oil Drain Lines
D11N (74Z1-593)
776B (6JC1-73)
777B (4YC1-871, 4YC873-935, 4YC937-939, 4YC943-947, 4YC949, 4YC956; 3NF1-15, 3NF17-26)
785 (8GB1-331, 8GB333-336)
3508 (99W308, 99W493, 99W495, 99W497, 99W555, 99W556, 99W558, 99W566, 99W590, 99W592, 99W618, 99W636, 99W637, 99W654, 99W670, 99W677, 99W678, 99W702, 99W712, 99W719, 99W748, 99W778, 99W783, 99W784, 99W790, 99W794, 99W797, 99W802, 99W808, 99W815, 99W825, 99W826, 99W836, 99W861, 99W882, 99W883, 99W900, 99W903, 99W905, 99W916, 99W921, 99W927, 99W982, 99W989, 99W1005, 99W1031, 99W1033, 99W1036, 99W1037, 99W1053, 99W1059, 99W1071, 99W1084, 99W1087, 99W1095, 99W1100, 99W1101, 99W1137, 99W1187, 99W1190, 99W1192, 99W1199, 99W1200, 99W1240, 99W1241, 99W1275, 99W1276, 99W1277, 99W1280, 99W1368, 99W1407, 99W1436, 99W1437, 99W1464, 99W1470, 99W1493, 99W1495, 99W1564, 99W1584, 99W1599, 99W1602, 99W1605)
3512 (96Z225, 96Z231, 96Z232, 96Z244, 96Z276, 96Z277, 96Z292, 96Z335, 96Z338, 96Z341, 96Z349, 96Z350, 96Z371, 96Z381, 96Z391, 96Z396, 96Z399, 96Z403, 96Z411, 96Z417, 96Z421, 96Z422, 96Z429, 96Z430, 96Z439, 96Z442, 96Z443)
If a spare engine has been installed in any of the Affected Product, the engine that was removed needs to be reworked.
Group B - Turbocharger Oil Supply Lines
D11N (74Z258, 74Z281-284, 74Z286-390, 74Z392-535, 74Z537-539, 74Z552)
776B (6JC62-69)
777B (4YC298, 4YC362, 4YC364, 4YC365, 4YC367, 4YC368, 4YC378-447, 4YC449-803, 4YC805-807, 4YC809-819, 4YC821, 4YC826, 4YC827, 4YC829, 4YC830, 4YC863; 3NF1-12)
785 (8GB211-216, 8GB218-301, 8GB303-309)
3508 (99W618, 99W636, 99W637, 99W654, 99W670, 99W677, 99W678, 99W702, 99W712, 99W719, 99W748, 99W778, 99W783, 99W784, 99W790, 99W794, 99W797, 99W802, 99W808, 99W815, 99W825, 99W826, 99W836, 99W861, 99W882, 99W883, 99W900, 99W903, 99W905, 99W916, 99W921, 99W927, 99W982, 99W989, 99W1005, 99W1031, 99W1033, 99W1036, 99W1037, 99W1053, 99W1059, 99W1071, 99W1084, 99W1087, 99W1095, 99W1100, 99W1101, 99W1137, 99W1187, 99W1190, 99W1192, 99W1199, 99W1200, 99W1240, 99W1241, 99W1275, 99W1276, 99W1277, 99W1280, 99W1368, 99W1407, 99W1436, 99W1437)
3512 (96Z335, 96Z338, 96Z341, 96Z349, 96Z350, 96Z371, 96Z381, 96Z391, 96Z396, 96Z399, 96Z403, 96Z411, 96Z417, 96Z421, 96Z422, 96Z429)
If a spare engine has been installed in any of the Affected Product, the engine that was removed needs to be reworked.
Parts Needed
Dealers will need to order parts for this Program. Order parts from the list or lists that apply to the Affected Product.
Group A - Turbocharger Oil Drain Lines
2 - 7N7559 Gasket - Elbow4 - 5P9890 Seal - Drain LIne2 - 5S7382 Bolt - Elbow2 - 2W0752 Gasket - Drain Line2 - 7X0291 Bolt - Elbow2 - 9Y5814 Elbow - Drain LineGroup B - Turbocharger Oil Supply Lines
8 - 7C2199 Clamp - Tube4 - 7C3036 Grommet - Clamp2* - 1D4541 Bolt - Plate4 - 0L2070 Bolt - Clamp4 - 5M2894 Washer - Clamp2 - 7N8875 Gasket - Tube1 - 6V4589 Seal - Tee1* - 1W2635 Plate1* - 2W1954 Plate1 - 9Y9887