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In 2006, China experienced heavy rainfall, leading to widespread flooding across many regions. When agricultural equipment like diesel engines were submerged, failure to properly maintain and repair them could result in serious corrosion and damage. To prevent this, here are some common and effective maintenance steps you should follow after a flood:
First, thoroughly rinse the surface of the diesel engine with clean water to remove dirt and debris. Then, use a metal cleaner or a suitable detergent to eliminate any oil residue on the exterior.
Next, position the engine so that the oil pan's drain point is at its lowest. Remove the oil drain plug and let the water and oil mixture drain out. Be careful not to completely drain the oil; stop when the flow becomes mostly water. Once drained, replace the plug securely.
Then, take apart the air filter. Remove the upper housing, filter element, and other components. If there’s water inside, clean all parts using a metal cleaner or diesel fuel. If the filter is made of plastic foam, wash it with soapy water (avoiding gasoline), rinse with clean water, dry it, and lightly oil it before reassembly. For paper-based filters, replace them entirely. Reinstall all cleaned parts according to the manufacturer's instructions.
After that, disconnect the intake and exhaust pipes as well as the muffler to drain any water inside. Open the decompression lever and manually turn the engine to check for water coming out of the intake or exhaust. If water is present, continue cranking until all water has been expelled. Reattach the pipes and muffler, add a small amount of oil into the air intake, then crank the engine several times before reinstalling the air filter. If the engine was flooded for a long time and the flywheel is hard to turn, it may indicate rusted cylinder liners or piston rings. In such cases, clean and replace the affected parts promptly.
Remove the fuel tank and drain all the fuel and water inside. Check the diesel filter and fuel lines for water, and if found, drain it completely. Clean the fuel tank and filter, then replace them. Reconnect the fuel system and fill the tank with clean diesel.
Drain the water from the cooling system and flush the water passages. Refill with clean river water or boiled well water until the water level indicator rises. Turn on the throttle switch and start the engine. Monitor the oil pressure gauge and listen for any unusual noises. Once everything appears normal, run the engine through a break-in process: start at idle, then gradually increase to medium speed, and finally to high speed, running each stage for about five minutes. After breaking in, drain the old oil, add fresh oil, and run the engine at medium speed for another five minutes before using it normally.
By following these steps carefully, you can significantly extend the life of your diesel engine after flooding. Always ensure proper drying and lubrication of all components to avoid long-term damage.