How to Rescue a Diesel Generator Set After Flooding: 5-Step Emergency Guide

During summer months, high temperatures and strong convective weather often bring heavy rainfall, increasing the risk of flooding in generator rooms. If a diesel generator set becomes submerged, improper handling can lead to severe equipment damage or even safety accidents. To ensure generator safety and minimize losses, it is crucial to follow this 5-step emergency rescue process after flooding.

Step 1: Cut Off All Power – Safety First

The moment flooding is discovered, immediately disconnect all power sources, including the main switch and battery cables. This helps prevent short circuits, secondary damage, or electric shock hazards.
Never attempt to start the generator while it's still wet or submerged—doing so may cause serious mechanical and electrical damage.

Step 2: Drain All Water – Leave No Hidden Pockets

Quickly remove water from the generator room using submersible pumps or manually. Then, disassemble the generator’s end covers, control panel, and other parts to allow internal water to drain out completely.
Pay close attention to areas like:

• Crankcase

• Fuel system

• Air filter
  Make sure no trapped water remains in any internal cavities.

Step 3: Disassemble and Clean Thoroughly

Disassemble the generator set down to its minimum operable units for thorough cleaning:

• Clean engine parts with fresh diesel fuel

• Replace all contaminated lubricating oil and coolant

• Blow-dry circuit boards and terminals using compressed air

• Remove rust from affected metal parts and apply anti-corrosion treatment

Note: Electronic control modules and sensors should be handled by professionals to avoid damage.

Step 4: Inspect System and Replace Damaged Parts

Once cleaning is done, perform comprehensive testing:

• Use a megohmmeter to check insulation resistance of the windings

• Test all sensors and electronic control components

• Replace all seals, bearings, and filters

• Check battery voltage and verify the charging system is functional

This ensures all systems are safe before restarting the generator.

Step 5: Gradual Test Run – Monitor Carefully

After everything is cleaned and checked, follow these steps to restart:

1. Turn the crankshaft manually to check for any mechanical blockage

2. Run the generator with no load for 10–15 minutes, observe its performance

3. Gradually apply load up to rated capacity

4. Continuously monitor oil pressure, water temperature, and electrical output

Important Tip: If the generator was submerged for more than 24 hours or exposed to seawater, do not attempt repairs on your own. Contact a professional service provider for a full inspection and restoration.

Conclusion:

Whether your diesel generator can be restored after flooding depends on how quickly and professionally it is handled. By following this 5-step emergency procedure, you can significantly improve the chances of recovery and reduce downtime. For expert support, feel free to contact Hosem Power. — we offer complete generator repair and emergency services worldwide.