Inspect and diagnose the problem.
Drain engine oil.
Remove the engine (if necessary).
Disassemble engine components.
Inspect all parts for wear or damage.
Repair or replace faulty components.
Reassemble the engine using new gaskets and seals.
Refill engine oil and coolant (if applicable).
Start the engine and check for leaks or abnormal noise.
Perform a road test to verify proper operation.