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Caterpillar: Confidential Yellow
PSP FOR INSTALLING AN AUTOMATIC ETHER INJECTION SYSTEM (AEIS) ON CERTAIN D11N TRACTORS - PS4429 - MAILED US AND CANADA, COFA, CO SA, LIMITED CACO, LIMITED CFEL
  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-33 A-25.1 AU-22 E-28.1 O-31 Revised 03/02/91 to correct part number error. In list of parts, 9X1047 Collar should read 9X0147 Collar. 1456 PS4429 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 "PS4429" as Part Number, "7755" as Group Number, and "96" as Description Code. Termination Date
February 29, 1992
Problem
Certain D11N Tractors equipped with a manual ether starting aid may experience problems during cold starts. An Automatic Ether Injection System (AEIS) can be installed to improve starting and combustion during cold startups and increase the service life of the engine.
Affected Product
Model Identification Number D11N 74Z1-729
Parts Needed
2 - 3B6768 Bushing 2 - 4B4274 Washer 2 - 8B0114 Spacer 8 - 8C5607 Mount 4 - 8C5608 Spacer 1 - 8C9006 Tee 1 - 8C9812 Switch Assembly 2 - 9D2867 Lens 2 - 9D3127 Base Assembly 2 - 8E0993 Plate 2 - 8E1355 Plate 1 - 8E1415 Valve Assembly 1 - 8E1446 Inlay 1 - 8E6595 Harness Assembly 1 - 9G9813 Alarm Group 1 - 4H1641 Pin 1 - 3J1907 Seal 1 - 3J5390 Plug 1 - 7J6596 Fitting Assembly 10 - 7K1181 Strap 1 - 2L8077 Terminal 1 - 2L8079 Terminal 8 - 4M0061 Bolt 8 - 5M3062 Bolt 1 - 8M2772 Clip 2 - 2N7456 Screw 2 - 7N5876