Views: 14 Author: Site Editor Publish Time: 2022-03-28 Origin: Site
Cummins injection pump ISBe, ISLe, ISB,
QSB engines with front or rear timing gears.
After replacing the fuel pump actuator, remeasure the fuel pump flow.
A faulty drain line bypass valve or fuel pump may cause high fuel flow through the return line.
Removal and disassembly of the injection pump of the Cummins 4ISBe 185, 6ISBe 300, QSB 6.7 engine
Disconnect the wiring harness connector of the electronic fuel control system executive valve.
Never loosen any fittings while the engine is running. This could result in personal injury and equipment damage.
When disconnecting or removing fuel lines, changing filters, or filling the fuel system, do not spill fuel. Turn the start switch to the ON position and wait 30 seconds before starting the engine, allowing the boost pump to run.
It is not necessary to bleed air from the high pressure fuel system circuit of Cummins 6 ISBe 210, 6ISBe 285,QSB 4.5, ISLe 375, ISLe 400, ISB 6.7 e4 300 before starting the engine. The system will fill with fuel while the starter is operating. Start the engine and check for leaks.
If there is no fuel in the filter and lines: this may be the case when the engine leaves the factory without pre-shipment testing, or after changing the fuel filters.
Before starting the engine, perform 120 strokes of the manual priming pump.
If there is fuel in the filter and lines: this may be the case when the engine is installed immediately after a factory-tested repair, or when it is reinstalled.
Perform 40 strokes of the hand priming pump before starting the engine. It is not necessary to bleed air from the fuel system high pressure circuit before starting the engine. The system will fill with fuel while the starter is operating.
Cummins ISBe, ISLe, ISB, QSB engine injector
In the fuel lines located after the injection pump Cummins 4ISBe 185, 6ISBe 300, QSB 6.7, the fuel is under very high pressure. Never loosen any fittings while the engine is running.
After turning off the engine, wait at least 10 minutes for the engine pressure to decrease before loosening the fittings in the fuel system high pressure circuit.
The drain manifold is located near the connection point of the vehicle drain line.
It can be found by going through the fuel drain lines from their fuel supply point (common high pressure pressure reducing valve, injector drain fittings, or high pressure pump drain port) to where they connect to another unit. This node will be the drain manifold.
Cylinder-by-cylinder testing will not help identify the location of such a leak, since it is upstream of the injector needle valve.
Since all injectors receive fuel from a common high pressure fuel line, the losses are distributed evenly across the cylinders.
Cummins Injector Tuning 6 ISBe 300, 6ISBe 210, 4 ISBe 185, ISLe 340, QSB 5.9
Low Fuel Drain Manifold:
- 3.9L and 5.9L Cummins QSB engines without EGR system
These engines have a quick connect fitting with a white tongue is installed in the fuel drain channel at the rear of the cylinder head.
Check for excessive flow in the injector drain circuit due to leakage.
Disconnect the quick connect fitting from the back of the cylinder head and install the pressure gauge adapter.
Install a quick-release shut-off fitting on the drain line removed from the head to prevent fuel from escaping from the head.
Place the other end of the adapter into the graduated cylinder.
High Position Fuel Drain Manifold with 2 Banjo Fittings:
- 5.9L Cummins QSB Engines with EGR
On these engines, a banjo fitting is installed in the fuel drain at the rear of the cylinder head.
Perform this procedure if fuel flow through the relief valve in the drain line is zero. If fuel flow through the relief valve in the drain line is not zero, use the procedure to return the valve to the closed position or replace it.
Fuel is drained from the Cummins 4ISBe 185, 6ISBe 300, QSB 6.7 injectors and from the pressure reducing valve of the common high pressure fuel line through the same drain line. Therefore, it is necessary to separate these two fuel streams.
Remove the banjo bolt from the high pressure common rail pressure reducing valve. Install the dedicated drain hose.
High-mounted fuel drain manifold with one banjo fitting in place of this removed bolt.
Drain all fuel into the sump. Run the drain line from the back of the cylinder head to the fuel drain manifold.
Remove the banjo bolt from the drain manifold on the injector drain side.
Install the drain hose in place of this removed bolt. Place the other end of the hose that drains fuel from the injectors into a graduated cylinder and collect the drained fuel.
Removal and installation of nozzles of the Cummins 4ISBe 185, 6ISBe 300, QSB 6,7 engine
Remove the fuel line installed between the common high pressure fuel line and the high pressure fuel line fitting.
Remove the high pressure fuel line fitting. Remove rocker cover. Remove the exhaust valve rocker.
The fuel line fitting must be removed before removing the injector to avoid damaging it.
Disconnect wiring from solenoid valve. Remove the 2 injector holder mounting bolts and the holder itself.
When removing injectors from the cylinder head of a Cummins 6 ISBe 210, 6ISBe 285,QSB 4.5, ISLe 375, ISLe 400, ISB 6.7 e4 300 diesel engine, use an injector remover.
Clean the tip and nozzle body with a soft, clean cloth dampened with a safe solvent.
Check the nozzle tip for carbon deposits or corrosion. Check the solenoid valve terminals for damage.
Check the injector inlet and the end of the high pressure fuel line fitting for damage.
The resistance between terminals must be less than 3.0 ohms. Check that the thickness of the injector sealing washer is correct.
Sealing washers with a thickness of 1.5 mm can be flat and convex.
Make sure the injector hole is clean and only one sealing washer is installed on the Cummins ISBe, ISLe, ISB, QSB injector.
The rounded edge of the nozzle holder must face the rocker arms. The injector inlet must face the intake manifold.
The nozzle holder can be removed on some nozzles. Lubricate the injector O-ring with clean engine oil.
Align the injector in the correct position on the cylinder head (inlet to the high pressure fuel line fitting).
Use the packaging cap of the injector solenoid valve. Make sure that the Cummins 4ISBe 185, 6ISBe 300, QSB 6.7 ICE nozzle is firmly installed in the hole.
Check the fuel line fitting. Check for burrs or deformation around the inlet and outlet ends of the fitting.
Check the slot filter for blockage or foreign particles.
Do not reuse the high pressure fuel line fitting if foreign particles are present.
Check the O-ring for breaks or signs of ageing.
Check the contact surface at the outlet of the Cummins ISBe, ISLe, ISB, QSB high pressure fuel line fitting for wear, signs of uneven contact, and leakage.
If there is a leak of high pressure fuel, the contact surface of the fitting will show signs of erosion in the form of fine lines or cuts.
Be sure to replace the high pressure fitting and nozzle if this is the case.
Install the high pressure fuel line fitting so that its end enters the injector inlet port.
Install the high pressure fuel line fitting nut and loosely tighten it.
Do not fully tighten the high pressure fuel line fitting nut yet. Tighten the Cummins ISBe, ISLe, ISB, QSB injector holder bolts.
Be sure to tighten the holder bolts evenly. Make sure that the gap between the holder and the nozzle is uniform around the entire circumference of the nozzle body.
Alternately hand-tighten the bolts by turning them 90 degrees to the torque shown below.
Connect the wiring to the solenoid valve, tighten the terminals.
Make sure that the wires of the solenoid valve do not touch the rocker arms when installing.
Install the rocker arm exhaust valves Cummins 4ISBe 185, 6ISBe 300, QSB 6.7 and adjust the gaps in them. Mount the rocker cover.
Install the fuel line connecting the common high pressure fuel line and the high pressure fuel line fitting.
On marine engines, open the valves on the supply and drain fuel lines.
Start the engine and check for leaks.
Fuel pump for Cummins ISBe, ISLe, ISB, QSB engine
Specifications
The relay is located in the wiring harness between the voltage regulator and the OEM power supply on the underside of the electronic control module.
The relay is energized for 60 seconds after the start switch is turned to the ON position. It also turns on when the Cummins ISBe, ISLe, ISB, QSB engine is started or while it is running. The relay must supply 24V to the voltage regulator.
The voltage regulator is located directly below the ECM. It receives 24V power from the relay when it is on. The regulator provides a 12V output to power the booster pump.
A 12 volt booster pump is used on machines with 24 volt electrical equipment. It should always operate when the relay is turned on, as described above. If the voltage at the output of the regulator is 24 V, it is faulty and must be replaced.
Replacing the fuel priming pump Cummins 4ISBe 185, 6ISBe 300, QSB 6.7
Disconnect the batteries. Shut off the fuel supply and return lines.
Thoroughly clean fittings and parts before removal.
Remove the fuel lines from the inlet and outlet of the booster pump.
Disconnect the wiring harness connector from the boost pump.
Remove the fastening parts of the Cummins diesel booster pump 6 ISBe 210, 6ISBe 285,QSB 4.5, ISLe 375, ISLe 400, ISB 6.7 e4 300 to the reverse side of the cooling plate of the electronic control module.
Remove booster pump. For most automotive engines, the boost pump can be removed without removing the ECM and its base plate.
For 24V systems that have a voltage regulator, remove it from the bottom edge of the electronic control module by unscrewing the 2 lower module mounting bolts.
The relay is attached to the wiring harnesses next to the ECM connectors.
Disconnect the voltage regulator harness connectors and remove the regulator.
Make sure the inlet and outlet ports are properly oriented - the thin-walled brass outlet should be directed towards the rear of the Cummins engine 6 ISBe 300, 6ISBe 210, 4 ISBe 185, ISLe 340, QSB 5.9.
Check the labeling of the inlet and outlet of the booster pump. Be sure to install a pump that is rated for the required voltage (12 or 24 V).
Install the boost pump to the support bracket behind the ECM cooling plate.
Install the fuel lines to the inlet and outlet of the booster pump. Tightening torque: 24 Nm.
For 24V systems that have a voltage regulator, mount it on the bottom edge of the electronic control module by screwing in the 2 lower module mounting bolts. Tightening torque: 25 Nm.
Connect the connectors of the Cummins 4ISBe 185, 6ISBe 300, QSB 6.7 diesel booster pump and 24 V voltage regulator (if any) to the wiring harness.
Open the cocks on the supply and drain fuel lines.
Connect batteries. Fill the fuel system. Start the engine and check for leaks.
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