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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 Adapter 8 - 7L3195 - Bolt-Support To Sleeve 8 - 2N2766 - Locknut-Support To Sleeve 8 - 2N2766 - Locknut-Sleeve 2 - 8N4401 - Clamp-Exhaust Elbow 2 - 8N2729 - Ring-Exhaust Elbow 2 - 8N2730 - Ring-Exhaust Elbow 1* - 7C3281 - Manifold-Rear (RH) 1* - 7C3283 - Manifold-Rear 1**- 7M7273 - Gasket-Turbo 4**- 2N2765 - Bolt-Turbo 4**- 2N2766 - Locknut-Turbo 2**- 2M5173 - Seal-Turbo Air Lines 2**- 5P5700 - Seal-Turbo Air Lines 1**- 7N7628 - Seal-Turbo Water Lines 1**- 7N7559 - Seal-Turbo Oil Lines 4**- 5P2755 - Bolt-Manifold 4**- 2N2766 - Locknut-Manifold 1**- 7N4904 - Gasket-Manifold 2***- 7M7273 - Gasket-Turbo 8***- 2N2765 - Bolt-Turbo 8***- 2N2766 - Locknut-Turbo 2***- 7C6370 - Clamp-Turbine Housing 2***- 7W9084 - Housing-Turbine * If needed because the end of the manifold will not fit correctly in new sleeve bore. ** If needed with replacement of 7C3283 Manifold. *** If needed because of excessive wear on the coupling bore in turbine housing.
Action Required
1. Remove the top turbocharger heat shields. 2. Remove the exhaust pipe supports and couplings. 3. Remove the rear top exhaust manifold heat shields. 4. Grind the excess material from the 7C3282 Exhaust Manifold. See the illustration. 5. Remove the rear exhaust manifold sections. 6. Install the rear exhaust manifold sections with the new sleeves. 7. Install the new exhaust pipe supports and couplings. 8. Install the turbocharger and exhaust manifold heat shields. ****** IMAGE: SEBE3919.01001.001 CAPTION:
Service Claim Allowances
Product Caterpillar Dealer Suggested Customer Suggested smu/age Parts Labor Hrs. Parts Labor Hrs. Parts Labor Hrs. (D/N) (Cost) (C/L) (Sell) 0-6000 100% 6 0 6 0 0 6000 - 33 1/3% 3 0 3 50% 610,000 This is an 12-hour job. If the user has participated 25% or more in previous repair, component hours apply; if not, machine hours apply. Attach a copy of the previous repair invoice to a paper claim or retain the invoice in the file for an on-line claim. When filing a claim for a spare engine use the following serial numbers as the vehicle serial number: U.S. and Canadian Dealers - 99Z21 CACO Dealers - 99Z621 CofA Dealers - 99Z121 COSA Dealers - 99Z421
Parts