ISC, ISCe, QSC8.3, ISL, ISLe3, ISLe4 and QSL9 Engines – 006-051   Injector Supply Lines (High Pressure)

Inspect the lines for cracks, chafing, or leaks. Make sure the lines are tightened to the proper specification.

Check the fuel pump connections.

Check the cylinder head connections.

Check the fuel line isolators for loose capscrews.

If the capscrew is loose, replace the isolator capscrew and bracket. The isolator capscrew and bracket can not be used twice.

Check the fuel pump connection.

Check the cylinder head connections.

Check the fuel rail connections.

Check the bracket capscrews that support the high-pressure rail supply line.

Check the bracket isolator capscrew.

WARNING  The fuel pump, high-pressure fuel lines, and fuel rail contain very high-pressure fuel. Do not loosen any fittings while the engine is running. Wait at least 10 minutes after shutting down the engine before loosening any fittings in the high-pressure fuel system to allow pressure to decrease to a lower level.

WARNING  Batteries can emit explosive gases. To reduce the possibility of personal injury, always ventilate the compartment before servicing the batteries. To reduce the possibility of arcing, remove the negative (-) battery cable first and attach the negative (-) battery cable last.

WARNING  When using solvents, acids, or alkaline materials for cleaning, follow the manufacturer’s recommendations for use. Wear goggles and protective clothing to reduce the possibility of personal injury.

• Disconnect the batteries. Refer to Procedure 013-009 in Section 13.
• Clean the area around the fuel lines with solvent.
• Close the fuel supply and drain valves. Refer to the OEM service manual.

WARNING  Depending on the circumstance, diesel fuel is flammable. When inspecting or performing service or repairs on the fuel system, to reduce the possibility of fire and resulting severe personal injury, death or property damage, never smoke or allow sparks or flames (such as pilot lights, electrical switches, or welding equipment) in the work area.

Remove the fuel lines from the fuel pump.

NOTE: Use two (2) wrenches to prevent the outlet fitting from turning.

Remove the fuel line clamp capscrews from the intake cover. This must be done before the injection lines can be pulled loose from the cylinder head.

Remove the fuel lines from the cylinder head.

WARNING  Depending on the circumstance, diesel fuel is flammable. When inspecting or performing service or repairs on the fuel system, to reduce the possibility of fire and resulting severe personal injury, death or property damage, never smoke or allow sparks or flames (such as pilot lights, electrical switches, or welding equipment) in the work area.

CAUTION  Use caution when disconnecting or removing fuel lines, replacing filters and priming the fuel system that fuel is not spilled or drained into the bilge area. Do not drop or throw filter elements into the bilge area. The fuel and fuel filters must be discarded in accordance with local environmental regulations.

If necessary, remove the air intake connection or turbocharger control actuator.

Loosen the fuel lines at the fuel rail, the fuel connector, and the high-pressure fuel pump outlet fitting.

Loosen the capscrews on the fuel line support bracket and isolator.

Remove the high-pressure fuel lines.

Before installing the injector supply lines, make sure the fuel connector is fully and properly seated against the injector.

Refer to Procedure 006-052 in Section 6.

Install the fuel lines in the reverse order of removal.

Tighten the fuel pump connection.

Tighten the cylinder head connection.

Tighten the fuel line isolators.

If the capscrew is loose, replace the isolator capscrew and bracket. The isolator capscrew and bracket can not be used twice.

Before installing the injector supply lines, make sure the fuel connector is fully and properly seated against the injector. Make sure the high-pressure connector retaining nut is tightened. Refer to Procedure 006-052 in Section 6.

Install the fuel lines in the reverse order of removal.

Tighten the fuel rail connections.

Tighten the fuel line from the fuel pump to the fuel rail at the fuel rail end first.

Position the fuel line from the pump to the rail.

Tighten the fuel line and the bracket isolator capscrew finger tight.

Tighten the fuel pump connections.

Tighten the bracket isolator capscrew.

Tighten the cylinder head connections.

Install the air intake connection and turbocharger control actuator, if removed. Refer to Procedure 010-022 in Section 2.

Install the fuel lines in the reverse order of removal.

Position the fuel lines from the fuel rail to the cylinder head and tighten the lines finger tight.

Tighten the fuel rail connections.

Tighten the cylinder head connections.

Position the fuel line from the pump to the rail and tighten the line finger tight.

Install the fuel line bracket and bracket isolator capscrews finger tight.

Tighten the fuel line from the fuel pump to the fuel rail at the fuel rail end first.

Tighten the fuel rail connections.

Tighten the fuel pump connections.

Tighten the fuel line bracket capscrews.

Tighten the fuel line bracket isolator capscrew.

Tighten the cylinder head connections.

Install the air intake connection and turbocharger control actuator, if removed. Refer to Procedure 010-022 in Section 10.

WARNING  Batteries can emit explosive gases. To reduce the possibility of personal injury, always ventilate the compartment before servicing the batteries. To reduce the possibility of arcing, remove the negative (-) battery cable first and attach the negative (-) battery cable last.

• Install the air intake connection, if removed. Refer to Procedure 010-022 in Section 2.
• Connect the batteries. Refer to Procedure 013-009 in Section 13.
• Open the fuel supply and drain valves. Refer to OEM service manual.
• Operate the engine and check for leaks.