Doosan Dual Fuel Engine GC18S-5

Pressure Regulator/Converter Inspection • Visually inspect the pressure regulator/converter (B) housing for coolant leaks.

• Refer to Chapter 5 if the pressure regulator/converter requires replacement. Fuel Trim Valve Inspection (FTV)

• Visually inspect the fuel trim valves (C) for abrasions or cracking. Replace as necessary.

• To ensure a valve is not leaking a blow-by test can be performed.

1. With the engine off, disconnect the electrical connector to the FTVs.

2. Disconnect the vacuum line from the FTVs to the pressure regulator/converter at the converter’s tee connection.

3. Lightly blow through the vacuum line connected to the FTVs. Air should not pass through the FTVs when de- energized. If air leaks past the FTVs when de-energized, replace the FTVs.;

Warning: Never remove the pressure cap on a hot engine.

Coolant level is equal to the 'COLD' mark on the coolant recovery tank

Did you add approved coolant to the specified level if the system was low?

Inspect Engine for Exhaust Leaks

Engine started and reached operating temperatures

Visual inspection of exhaust system performed

Any leaks found in the exhaust system

Describe the location and severity of the leaks found

Length from the post-catalyst sensor to tailpipe is the same as original factory

Wire routing for the oxygen sensors is still keeping wires away from the exhaust system

Visual inspection of the oxygen sensors performed

Any damage detected on the oxygen sensors

Inspect Air/Fuel Valve Mixer Assembly

LP mixer inspected as per Chapter 5

Intake throttle assembly and intake manifold inspected for looseness and leaks

Throttle assembly motor housing inspected for coking, cracks, and missing cover retaining clips

Repairs and replacements done on throttle assembly

NOTE: Refer to Chapter 5 for procedures on removing the mixer and inspecting the throttle plate.

Warning: This procedure requires trained personnel with PPE!

Upload a photo of the leak check squirt bottle or pump spray bottle

Enter the name of the approved leak check solution used

Sprayed the solution on the fuel system fuel lines and connections?

Waited 15-60 seconds before inspection?

Any leaks causing the solution to bubble?