NUT 4W2480 - Caterpillar

Engine: G3516B (S/N: 7EZ1-UP; CTW1-UP)Generator Set: G3516B (S/N: CSC1-UP)Introduction
Do not perform any procedure in this Special Instruction until you have read this information and you understand this information.This Special Instruction provides the information for changing the engine's emission control from a system that is controlled by oxygen feedback to a system that is controlled by charge density feedback. The following references are also needed:
Installation and Initial Start-Up Procedure, REHS0531
Systems Operation/Testing and Adjusting, RENR2268
Troubleshooting, RENR2270
Operation and Maintenance Manual, SEBU7201Required Parts
Table 1
Required Parts    
Quantity     Part Number     Description    
1     239-5791     Fuel Valve Gp    
1     241-6867     Engine Harness As    
1     240-3496     Plate As    
1     240-3497     Bracket    
1     236-8215     Harness    
1     247-0280     Harness    
1     174-7914     Sensor Harness As    
1     240-8927     Tube As    
1     240-8928     Bracket    
2     3E-2331     Plug    
1     9Y-6792     Spark Plug Gasket    
1     109-1086     Spacer    
5     5M-2894     Hard Washer    
2     0L-1351     Bolt    
2     9X-6458     Hard Washer    
2     0S-1594     Bolt    
1     4D-9517     Clip    
50     9X-6772     Cable Strap    Disable the Engine
Secure the engine.
Switch off DC power to the engine. Switch off AC power to the engine.
Illustration 1 g00104545
Attach warning signs to the engine.
Disconnect the power source from the starting system.
Close the manual shutoff valve for the gas supply.
Drain the engine coolant to a level that is below the vent line.Modify the Water Lines Group
Illustration 2 g01119068
Top view (1) 190-7446 Tube As
Drain the engine coolant to a level that is below tube (1) .
Remove tube (1) .
Illustration 3 g01119070
Top view (2) 240-8928 Bracket (3) 4D-9517 Clip (4) 240-8927 Tube As
Install bracket (2). Use a 0S-1571 Bolt and a 9X-6458 Hard Washer to mount the bracket.
Install tube (4) and clip (3) .
Be sure that all of the fittings on the vent line are tight. Be sure that the vent line is secured with clips.
Refill the engine with coolant. Refer to Operation and Maintenance Manual, SEBU7201, "Cooling System".Modify the Fuel System
Illustration 4 g01115420
Fuel valve (1) Fuel valve (2) Support bracket
Disconnect the wiring harness from fuel valve (1) .
Remove fuel valve (1) and support bracket (2). Retain the bolts.
Illustration 5 g01114657
New brackets (3) 240-3496 Plate As (4) 240-3497 Bracket
Illustration 6 g01114664
Top view (3) 240-3496 Plate As (4) 240-3497 Bracket
Install plate (3) and bracket (4). Use the original bolts and new 5M-2894 Hard Washers for plate (3). Use 0L-1351 Bolts and 9X-6458 Hard Washers for bracket (4) .
Illustration 7 g01119188
Side view (5) 239-5791 Fuel Valve Gp
Install fuel valve (5) onto plate (3) and bracket (4) .
Illustration 8 g01115845
(6) Insert (7) Carburetor
Remove inserts (7) from carburetors (6). Both inserts must be removed.Sensor