FILTER GP-PRIMARY FUEL 3944295 - Caterpillar

Illustration 3 g06203232
High-pressure accumulator-quill
(4) Leak detection plug/port
Table 6
Troubleshooting Test Steps Values Results
9. Check the Leak Detection Ports on the Fuel Accumulator Quill Tubes
A. Turn the keyswitch to the OFF position.
B. Remove the all the leak detection port on each of the fuel accumulator quill tubes.
C. Crank/Start the engine.
D. If the engine can be started. Operate the engine at low idle and high idle.
E. Inspect each of the leak detection ports for signs of fuel leakage.
Leaks
Result: A leak was detected on the accumulator quill tube leak port.
Repair: A failed high-pressure fuel crossover line has been detected. Perform the following procedure:
1. Release the pressure in the high-pressure rail by loosening the end plug on one of the last two fuel accumulators. Refer to Testing and Adjusting, "Fuel Rail Pressure - Release" for instructions on how to release the pressurized fuel.
2. Verify the "Fuel Rail Pressure" reading in Cat ET is 0 8 MPa (0 1160 psi) prior to servicing the fuel system.
3. Replace the high-pressure fuel crossover line nearest to the leaking accumulator quill tube.
Proceed to Test Step 12.
Result: There were no leaks detected.
Repair: There is a high-pressure fuel leak before the injector bank. Perform the following procedure:
1. Release the pressure in the high-pressure rail by loosening the end plug on one of the last two fuel accumulators. Refer to Testing and Adjusting, "Fuel Rail Pressure - Release" for instructions on how to release the pressurized fuel.
2. Verify the "Fuel Rail Pressure" reading in Cat ET is 0 8 MPa (0 1160 psi) prior to servicing the fuel system.
3. Remove and inspect all the high-pressure lines between the high-pressure fuel pump and each injector bank. Replace the lines if necessary. Torque the lines to the proper value upon reinstallation.
Proceed to Test Step 12.
10. Check the Torque on the High-Pressure Lines and Quill Tubes
A. Turn the keyswitch to the OFF position.
B. Check the torque on each one of the high-pressure fuel lines and accumulator quill tubes.
Torque Value
Result: All torque values were within specification.
Proceed to Test Step 11.
Result: The torque values were not all within specification.
Repair: Tighten the lines and/or accumulator quills that were not properly torqued.
Proceed to Test Step 12.
Illustration 4 g06211152
Secondary filter assembly
(5) Injector cooling orifice fitting
Illustration 5 g06211163
Injector cooling circuit supply
(6) Supply lines are on the right side of the head
(7) Return lines are on the left side of head
Table 7
Troubleshooting Test Steps Values Results
11. Check for a Leak into the Injector Cooling Circuit
A. Turn the keyswitch to the OFF position.
B. Disconnect both speed/timing sensors.
C. Disconnect the engine camshaft speed/timing sensor from the wiring harness connector.
Note: Both speed/timing sensors must be disconnected to prevent the engine from starting during this test.
D. Disconnect the injector cooling circuit supply line from the injector cooling supply orifice fitting.
E. Cap the injector cooling supply line end with contamination control part number 9U-7079 Tapered Cap/Plug.
F. Install a threaded plug on the injector cooling circuit orifice fitting to seal orifice so no fuel comes from the manifold during cranking. Use 6V-9831 Cap