CYLINDER AS 2809151 - Caterpillar

Caterpillar: Confidential Yellow
PSP FOR EXHAUST PIPES, AND EXHAUST PIPE SUPPORTS ON D11N TRACTORS AND 3508 ENGINES - PS4257 - MAILED US AND CANADA, COF A, COSA, LIMITED CACO
  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.
(Revised January 1989) U-182 A-87.1 AU-114 O-115 1061 1059 PS4257 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 "PS4257" as Part Number, "7755" as Group Number, and "96" as Description Code. This Revised Service Letter replaces the November 4, 1988 Service Letter and the December 8, 1988 Service Letter Supplement. Changes have been made to the Parts Needed, Action Required, and Service Claim Allowances. Termination Date
November 30, 1990
Problem
The turbocharger outlet exhaust pipe supports may yield causing misalignment of the turbocharger outlet coupling. This in turn may result in wear, exhaust leaks, and possibly cause the pipes todisconnect if the yielding and wear is severe enough.
Affected Product
Model Identification Number D11N 74Z1 - 535, 537 - 539, 543 3508 99W495, 497, 654, 702, 719, 784, 790, 794, 797, 802, 808, 861, 881, 900, 905, 916, 921
Parts Needed
2 - 7N4904 - Gasket-Manifold To Head 1 - 9Y7654 - Sleeve-Exhaust Manifold (LH) 1 - 9Y7655 - Sleeve-Exhaust Manifold (RH) 8 - 5P3345 - Bolt-Exhaust Manifold Sleeve 2 - 9Y7672 - Coupling-Turbo 1 - 9Y7653 - Support-Exhaust Pipe (RH) 1 - 9Y7652 - Support-Exhaust Pipe (LH) 2 - 7N5087 - Gasket-Support To