RING-BACKUP 7Y4633 - Caterpillar

Table 1
Tools Needed    
Part Number     Part Name     Quantity    
1U-5470
or
198-4240     Engine Pressure Test Group
or
Pressure Indicator Tool Gp     1    
3Y-2888     Connector     1    
3J-1907     O-Ring Seal     1    Note: Both the 5P-2720 Probe Adapter and the 5P-2718 Pressure Probe can be used with these tools. Use these additional tools to allow the future installation of pressure probes.
Fuel leaked or spilled onto hot surfaces or electrical components can cause a fire. Clean up fuel spills immediately.
Keep all parts clean from contaminants.Contaminants may cause rapid wear and shortened component life.
Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids.Refer to Special Publication, NENG2500, "Caterpillar Dealer Service Tool Catalog" for tools and supplies suitable to collect and contain fluids on Caterpillar products.Dispose of all fluids according to local regulations and mandates.
The 1U-5470 Engine Pressure Test Group or the 198-4240 Pressure Indicator Tool Gp can be used in order to check the engine's fuel pressures.
Illustration 1 g01229712
1U-5470 Engine Pressure Test Group (1) Pressure indicators (2) Zero adjustment screw (3) Pressure indicator (4) Pressure tap (5) Pressure indicatorThis tool group has a gauge that is used to register the pressure in the fuel manifolds. The Special Instruction, SEHS8907 is with the tool group.
Illustration 2 g01229716
Fuel return line (typical example) (1) Fuel supply passage (2) Tube assembly (CPU to fuel supply passage) (3) Pressure regulator (4) Tube assembly (fuel transfer pump to fuel filter)
Illustration 3 g01229719
Fuel pressure test (typical example) (5) Fuel filter base (6) Fuel pressure tap (unfiltered tap) () Fuel pressure tap (filtered tap)During both normal operating conditions and load conditions, the fuel pressure should register the following range:
400 to 525 kPa (58 to 76 psi)At low idle, the fuel pressure at the fuel filter's inlet should be at the following amount:
400 to 435 kPa (58 to 63 psi)The fuel pressure to fuel supply passage (1) should be the same amount, if you subtract the change in pressure (delta P) across the filter. With a new filter, the pressure drop across the fuel filter typically registers the following amount:
35 kPa (5 psi)As abrasive particles collect in the fuel filter, the pressure differential across the filter will increase. As the fuel filter becomes plugged, the pressure differential across the fuel filter may increase to as much as 69 kPa (10 psi) before a significant power loss is detected by the operator. Low fuel pressure will cause cavitation and internal damage to the unit injectors. The pressure differential across the fuel filter should not exceed 69 kPa (10 psi).Pressure regulator (3) is mounted directly in the cylinder head. The regulator is located at the fuel return port toward the rear end of the fuel supply passage (1) . The orifice maintains fuel pressure at low engine rpm.To check the unfiltered fuel