09300-00423 PUMP ASSY, INJECTI Denso Cross

Caterpillar: Confidential Yellow
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.
This Program can only be administered after a failure occurs. The decision whether to apply the Program is made by the dealer. When reporting the repair, use "PS0482" as Part Number, "7755" as Group Number, and "96" as Description Code.
Although this Program is to be administered as described above on the Affected Product, nozzles in parts stock should be inspected as soon as possible.
This Revised Service Letter replaces the September 27, 1990 (Revised January 1991) Service Letter. Changes have been made to the Affected Product and the Parts Disposition. The 1990 Mail Code "TT-23" was added.
Termination Date
September 30, 1991Problem
The lift adjusting screw may break in certain 7E3969 1W5829, 4W8483, and 7W3710 Fuel Injection Nozzles with date codes of A9 thru M9, and A0 thru L0. If the adjusting screw breaks the adjustment screw in the nozzle can vibrate toward the fuel shutoff position which can result in the following symptoms:
A) Low Horsepower. The affected engine may not reach rated rpm. The engine does not emit any excessive black smoke. The engine may or may not have a detectable miss.B) Low Horsepower. The affected engine may not reach the rated rpm. The engine may emit heavy black smoke.C) Low Idle Misfire. Some engines run at rated speed but have a miss when idling.Affected Product
Model & Identification Number
3208 (30A3876-4565; 90N72172-73198; 75V10138-10420; 62W58913-Up; 01Z19535-22859; 03Z9391-10398; 51Z79496-80434)
Parts Needed
8* - 7E3969 Nozzle8* - 9L6969 Nozzle8* - 9N3299 Nozzle8* - 1W5829 Nozzle8* - 4W1819 Nozzle8* - 4W8483 Nozzle8* - 7W3710 Nozzle*Refer to your engine arrangement for the correct part number.Action Required
Parts Stock
Inspect all 7E3969, 9L6969, 9N3299, 1W5829, 4W1819, 4W8483, and 7W3710, Fuel Injection Nozzles for the date code as shown in the illustration. If date codes of A9, B9, C9, D9, E9, F9, G9, H9, I9, J9, K9, L9, M9, A0, B0, C0, D0, E0, F0, G0, H0, I0, J0, K0, or L0 are on the nozzles, remove the nozzles from parts stock.
Fuel Injection Nozzle Date Codes If the part number or date code is difficult to read, apply white paint to the area and carefully remove any excess.
Affected Product
If possible, isolate the cylinder(s) with a failed nozzle by loosening the fuel line nuts. The nozzle cap(s) may be removed to check for a broken lift adjustment screw.
Check the date code on the replacement nozzles before installing them. The date code on the flat of the nozzle nut must be M0, A1, B1, C1, or higher. Some nozzles will have a date code above the part number and a second date code on another flat of the nozzle nut. The second date code will continue two letters and a number. The first letter will always be an "R". The second letter is for the month "A-M". The number will be 0 for