ISC, ISCe, QSC8.3, ISL, ISLe3, ISLe4 and QSL9 Engines – 006-006   ECM Cooling Plate, Fuel Cooled

The ECM cooling plate assembly provides a vibration isolated mounting location for the ECM. The cooling plate also provides ECM cooling and incorporates the fuel lift pump. A check valve at the outlet port in the ECM cooling plate makes sure that the fuel system is primed while the fuel lift pump is running.

Check the ECM cooling plate for damaged vibration isolators, loose capscrews, or fuel leaks.

Make sure that the ground strap is properly installed. A missing or poorly connected ground strap may cause intermittent engine performance problems.

The ground strap must be connected between the head of the ECM mounting bolt and the ECM.

The ground strap must be connected to an unpainted block surface that is free of corrosion.

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  Fuel is flammable. Keep all cigarettes, flames, pilot lights, arcing equipment, and switches out of the work area and areas sharing ventilation to reduce the possibility of severe personal injury or death when working on the fuel system.

WARNING  Wear appropriate eye and face protection when using compressed air. Flying debris and dirt can cause personal injury.

WARNING  When using a steam cleaner, wear safety glasses or a face shield, as well as protective clothing. Hot steam can cause serious personal injury.

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.

CAUTION  Clean all fittings before disassembly. Dirt or contaminants can damage the fuel system.

Before servicing any fuel system components, (such as fuel lines, fuel pump, injectors, etc.) which would expose the fuel system or internal engine component to potential contaminants prior to disassembly, clean the fittings, mounting hardware, and the area around the component to be removed. Dirt or contaminants can be introduced into the fuel system and engine if the surrounding areas are not cleaned, resulting in damage to the fuel system and engine.

• Disconnect the batteries. Refer to Procedure 013-009 in Section 13.
• Disconnect the harness connections from the ECM.
• Disconnect the unswitched battery power at the batteries, marine engines only.
• Disconnect the unswitched ECM power connection on the SIM mounting plate, marine engines only.
• Disconnect the ECM ground strap.
• Disconnect the engine harness from the electric fuel priming pump.
• Close the fuel supply and drain valves, if equipped.
• Disconnect the fuel supply lines. Refer to Procedure 006-024 in Section 6.
• Remove the ECM from the cooling plate. Refer to Procedure 019-031 in Section 19.

NOTE: The electric fuel priming pump and priming pump fuel lines will be attached to the ECM cooling plate while the cooling plate is being removed.

Remove the ECM cooling plate capscrews and the ECM cooling plate from the engine block.

Remove the following components from the ECM cooling plate:

• Male banjo quick disconnect fitting
• Male banjo check valve fitting
• Fuel lift pump supply lines
• Fuel lift pump brackets
• Fuel lift pump.

Inspect the ECM cooling plate for leaks (note that the fuel passages are contained in a tube that is cast into the cooling plate).

Replace any damaged vibration isolators.

Inspect for leaks in the electric fuel supply pump priming circuit. Look for cracked fuel tubes, damaged o-rings, or damaged seal washers.

Inspect the check valve for debris or damage.

Install the electric fuel priming pump and the priming circuit fuel lines. Refer to Procedure 005-045 in Section 5.

Be sure the lines are supported while tightening the banjo screws. The lines must not be permitted to bind.

Be sure the ECM check valve is installed into the bottom (outlet) fitting of the ECM cooling plate.

Install the ECM cooling plate assembly on the engine block. Tighten the capscrews.

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.

CAUTION  Failure to properly install the ECM ground strap may cause intermittent engine symptoms including intermittent engine stalls. One end of the ground strap must be installed between the ECM housing and the head of the bottom most ECM mounting capscrew. The other end of the ground strap must be tightly bolted to an unpainted block surface that is free from corrosion.

NOTE: Be sure the vibrations isolators are installed correctly. The isolators fit in a single direction into the chamfered locators.

• Install the ECM on the ECM cooling plate. Refer to Procedure 019-031 in Section 19.
• Install the ECM on the ECM cooling plate. Refer to Procedure 019-031 in Section 19.
• Install the suction fuel lines, if removed.
• Connect the fuel supply lines. Refer to Procedure 006-024 in Section 6.
• Connect the engine harness to the electric fuel priming pump.
• Connect the ECM ground strap.
• Connect the unswitched ECM power connection on the SIM mounting plate, marine engines only.
• Connect the harness connections to the ECM.
• Connect the unswitched battery power at the batteries, marine engines only.
• Connect the batteries. Refer to Procedure 013-009 in Section 13.
• Open the fuel supply valves, if equipped.
• Cycle the keyswitch and allow the lift pump to operate for 30 seconds. Afterwards, turn the keyswitch OFF and back ON again allowing the lift pump to operate again.
• Allow the lift pump to operate for three or four 30-second cycles before attempting to start the engine.
• Operate the engine and check for leaks.