Preparation of the engine systems and components Featured
Be sure to make it a rule to check the readiness for every starting of the engine according to the following procedures. More careful checking of the readiness is required for the starting initially after installation or overhaul or a period of standstill.
1. Preparation of the Engine for StartingCheck the last date when the Crank Case Cover opened for ensuring everything cleared after inspection or maintenance.Check the date when the last tightening of major fasteners.Check if there is any loosened part and correct them, if any.Check all covers are closed.
Do not open the covers of the engine during running. Check cleanness around the engine.
Make sure that the rotating parts of the engine is free from any obstacles. Take out tools and rags from the engine. Electric power ‘ON’ for the control system.Check functions of monitoring panel, local and remote control, etc.
2. Preparation of Cooling Water SystemCheck cooling water tank level and fill, if needed.Operate cooling water supply system, if stopped.Check valves and set to operating position.Check and correct any leakages.Check air venting in the cooling water circuit.Check water pressure and temperature.
3. Preheating of the Engine
Preheating of the engine is required for protecting the engine from thermal shock as well as proper circulation of fuel oil and lubricating oil.Operate cooling water heating system, if installed.
Make sure to circulate heating water through the cylinders at least for 2 hours before starting. Temperature of the water shall be depending on the fuels for starting as below. Starting on HFO : over 60 ℃Starting on MDO : over 40 ℃
4. Preparation of Fuel SystemDrain fuel tanks for water and check filters.Check fuel tank level and fill, if needed.Check cooling system for diesel fuel oil.For starting on HFO, recheck preheating of the engine ready for HFO circulation.
Emergency cold starting on HFO is not accepted. Cold engine may cause clogging of the fuel injection system by heavy fuel oil, which may cause serious damages on fuel injection system due to excessively high fuel injection pressure when starting.
If engine stopped on HFO without heating continuously, the HFO inside fuel injection system should be removed and cleaned by MDO before restarting. All fuel injection pumps, valves and high pressure pipes should be dismantled and cleaned.Operate fuel supply system, if stopped.Check valves and set to operating position.Check any leakages and correct them.Check air venting in the circuit.Check fuel oil temperature, viscosity and pressure.
5. Preparation of Lubricating Oil SystemCheck the date when the last sampling for oil quality test.Check oil filters and replace them, if needed or after long term out of operation or overhaul.Check oil sump tank level and fill, if needed.Check valves and set them to operating position.
6. Pre-lubrication of the EngineCheck lubricating oil temperature which should be heated up to 40℃ by heater.
If oil temperature is too low or oil viscosity is higher than 1500 cSt (10 ℃ SAE40), electric motor for pre-lubricating pump may be overloaded. Operate pre-lubricating pump, if stopped.Check and correct any leakages of the system.Check oil pressure rise and pre-lubricating condition.Prelubricating should be continued at least for 5 minutes before starting.
If the engine has been stopped for a period of time or overhauled, make sure that oil comes out from bearings, rollers on cam and rocker arms on cylinder heads. Tapes attached during maintenance may block the oil passages. Open Indicator Cock.
If there is any doubt about dry condition on running surface of cylinder liner, drop lubricating oil about 50cc through indicator cock and spray lubricating oil under the piston before turning the engine. Engage turning gear and rotate crankshaft manually at least two turns to ensure engine moving parts are in order and combustion chambers are free from any excessive fluid, i.e, water or lubricating oil or fuel oil.
If there is any sign of escaping fluid through indicator cock, wrap the indicator cock with cleaning rags to avoid the fluid scattering over. And turn the crankshaft to ensure no escape of fluids from cylinder.Fuel remained inside cylinder before starting may cause over pressure and heavy smoke during starting. Disengage from turning gear.
7. Preparation of Starting Air SystemDrain air tank for water and check filters.Check air tank pressure and fill, if needed. (20 ~ 30bar)Check control air pressure.Check valves and set to operating position.Check any leakages and correct them.
8. Preparation of Fuel Control System.Check smooth movement of fuel regulating linkages from governor to every rack of the fuel injection pump. Governor Load Index and Fuel Pump rack.Check function of ‘Emergency Stop’ button and reset. Push the handle on fuel regulating shaft to ‘Max’ position and press ‘Emergency Stop’ button, then every rack of fuel injection pump should be extruded to ‘Stop’ position.Check flexibility of each rack of fuel injection pump. Rack of fuel injection pump should be returned to original position when pushing or pulling it manually.Check mechanical fuel limiter for over load (Set to 110% load).
If mechanical fuel limiter is not set correctly, the engine may be seriously damaged. Check mechanical fuel limiter for start (Set to about 30 ~ 50% load).
9. Air RunningCheck if engine load is removed. (Set governor speed knob to minimum to prevent fuel entering.)Check indicator cock opened.Check air intake and exhaust gas passages are free.Check ‘Start Ready’ lamp ‘ON’.Check if engine load is removed. (Set governor speed knob to prevent the fuel from entering)Press ‘Start’ button and check air running condition.Press ‘Start’ button again and check air running condition.
Air running is recommended to ensure pre-lubrication and readiness for starting, if only possible.