Doosan Dual Fuel Engine G15S-5

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?

Locate the electrical connector for the fuel lock (A)

Disconnect the electrical connector

Did the engine run out of fuel and stop within a short period of time?

Turn the ignition key switch off and re-connect the fuel lock-off connector

Sign off on the fuel lock-off operation test

Coolant temperature between 80-90°C

Transmission in neutral position

NOTE: If RPM is not normal, it is impossible to measure the proper ignition timing, so measure it at a normal RPM.

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.;

• Remove and inspect the spark plugs. Replace as required.

• Inspect the ignition coil for cracks and heat deterioration. Visually inspect the coil heat sink fins. If any fins are broken replace as required.