CAMSHAFT-FUEL PUMP 9N3751 - Caterpillar

Marine Engines:
3508 (S/N: 96Y1-UP; 69Z1-UP)
3512 (S/N: 50Y1-UP)
3516 (S/N: 29Z1-UP; 72Z1-UP)
Generator Set Engines:
3512 (S/N: 67Z1-UP)
Some early 3500 Family Mechanical Unit Injection (MUI) injectors have been cancelled and replaced by newer injectors. Repair parts for the cancelled MUI injectors are no longer available. Refer to Table 1 for the affected part numbers. Replacement of these injectors in certain marine applications may require the engine governor to be changed. When the new injectors are used in conjunction with the 7N-6168 Governor Gp or with the 1W-0516 Governor Gp, instability of the engine RPM can occur. If instability occurs, convert the existing governor into the corresponding governor in Table 2.Note: The following part numbers will be cancelled when the parts inventory has been exhausted: OR-1757 Fuel Injector As, 0R-2781 Fuel Injector As and 0R-3252 Fuel Injector As. When this material is consumed, the replacement will become effective. For all of the other part numbers, the replacements are currently effective, or the replacements will take effect when the parts inventory has been exhausted.
Table 1
Part Number     Part Name     Replacement Part Number     Replacement Part Name     Notes    
0R-1757     Fuel Injector As     0R-1756     Fuel Injector As     Use in all applications
The following engines will require parts from Table 2: (S/N: 96Y683-UP; 50Y614-UP; 29Z787 and 791-817)    
0R-2781     Fuel Injector As     0R-1759     Fuel Injector As     Use in all applications    
0R-2783     Fuel Injector As     0R-1758     Fuel Injector As     Use in all applications    
0R-3251     Fuel Injector As     0R-1760     Fuel Injector As     Use in all applications    
0R-3252     Fuel Injector As     0R-0906     Fuel Injector As     Use in all applications
The following engines will require parts from Table 2: (S/N: 96Y1-682; 50Y1-613; 29Z1-786; 29Z788-790)    
0R-3253     Fuel Injector As     0R-0995     Fuel Injector As     Use in all applications
The following engines will require parts from Table 2: (S/N: 67Z1-534; 69Z1-274; 72Z1-338)    
Table 2
Chart for Converting Governors    
Conversion     Quantity     Part Number     Part Name    
7N-6168 Governor Gp to 124-3172 Governor Gp
or
1W-0516 Governor Gp to 124-3173 Governor Gp     1     7W-3555     Electrical Shutoff Gp    
1 7N-9738     Receptacle Housing    
1 7N-7780     Connector Pin    
1 7N-7779     Connector Socket