1. The oil cooler is leaking. Perform a pressure test to determine the leak point and correct or replace it.
2. The most direct and effective way to manage water entering the generator is to build a simple shed to protect the generator and carry out regular inspections of the drainage system.
3. If the water pump is leaking, check the water seal and replace the water pump directly if necessary.
4. Water is leaking from the cylinder liner, replace the cylinder liner rubber ring.
5. The diesel engine cylinder is cracked, which is a relatively big problem, it is generally better to replace it directly.
For reference only (Editor's response from Fujian Yanan Motor)
The engine does not matter much. The generator should be dried and the resistance should be checked after drying it. Finished. Take a blood pressure testn outfit and make sure everything is normal before use. ---Generator professional
Then you should not turn on the machine. Remove the exhaust pipe not the muffler...remove the compressor, then crank the engine and remove the water pan. No need to disassemble other parts.