CLAMP 5188446 - Caterpillar

Specifications
Table 1
Parameter Value
Minimum Inlet Fuel Pressure −20 kPa (−3 psi)
Maximum Inlet Fuel Pressure 100 kPa (14.5 psi)
Maximum Inlet Fuel Pressure if priming pump is used 50 kPa (7.25 psi)
Maximum Fuel Filter Differential Pressure 75 kPa (10.8 psi)
Mechanical Unit Injector System Pressure 550 50 kPa (80 7 psi)
Electronic Unit Injector System Pressure 820 20 kPa (119 3 psi)
Maximum Return Fuel Restriction 350 kPa (51 psi) Note: Values above are measured at engine rated speed and load.Note: System pressure reading is measured at the regulator refer to illustration 3, port (8).Introduction
This procedure below describes adjusting the fuel pressure control valve, fuel filter differential pressure, and return fuel restriction. Required Tools
Table 2
Required Tools
Qty Part No.
1 1U-5470 Engine Pressure Gp
Illustration 1 g00284796
1U-5470 Engine Pressure Gp
(1) Pressure indicators
(2) Zero adjustment screw
(3) Pressure indicator
(4) Pressure tap
(5) Pressure indicator Test Preparation - Fuel Filter Differential Pressure
Fuel leaked or spilled onto hot surfaces or electrical components can cause a fire. To help prevent possible injury, turn the start switch off when changing fuel filters or water separator elements. Clean up fuel spills immediately.
Do not allow dirt to enter the fuel system. Thoroughly clean the area around a fuel system component that will be disconnected. Fit a suitable cover over disconnected fuel system component.
Use a suitable container to catch any fuel that might spill. Clean up any spilled fuel immediately.
Illustration 2 g03031676
Front of engine (left or right side)
(6) Fuel pressure tap (filtered fuel)
(7) Fuel pressure tap (unfiltered fuel)
Turn off the engine
Slowly loosen plugs (6) and (7). Refer to illustration 2
Connect the 1U-5470 Engine Pressure Gp into pressure taps (6) and (7) using hoses provided. Test Procedure - Fuel Filter Differential Pressure
Start the engine
Operate the engine to rated speed and load.
Note the pressure reading.
If, the fuel filter differential pressure is above 75 kPa (10.8 psi), replace both fuel filters according to the engine Operation and Maintenance Manual .
After filters have been replaced recheck the differential pressure using the procedure above. Test Preparation - Fuel System Pressure
Illustration 3 g03031716
Fuel pressure control valve is located on the right side of the front housing.
(8) Regulator port
(9) Fuel pressure control valve
(10) Adjustment screw
Turn off the engine
Remove plug (8)
Connect the 1U-5470 Engine Pressure Gp to port (8) using provided hoses. Test Procedure - Fuel System Pressure
Start the engine
Operate engine to rated speed and load.
Note the pressure reading. Adjustment Procedure - Fuel System Pressure
If, the fuel system pressure is not within the specifications listed in table 1, adjust the pressure using adjustment screw (10).
After adjustment recheck the system pressure using the procedure above. Test Preparation - Fuel Return Restriction
Turn off the engine
Connect the 1U-5470 Engine Pressure Gpinline with the customer fuel return line. Test Procedure - Fuel Return Restriction
Start the engine.
Operate the engine to rated speed and load.
Note the pressure reading.
If, the fuel return pressure exceeds 350 kPa (51 psi) customer return fuel line must be corrected to reduce restriction.