What kind of diesel generator needs to be overhauled?

The diesel generator set has the following five cases, I suggest the customer to overhaul the unit:

1, diesel engine work is weak, accelerated after the decline significantly, instability, sound mutation, exhaust smoke smoke;

2. The diesel engine is difficult to start at room temperature. During the operation, the crankshaft bearing, connecting rod bearing and piston pin are knocking;

3, the normal temperature of the diesel engine, the cylinder pressure is less than 70% of the required pressure;

4, diesel engine oil, engine oil consumption increased significantly, the phenomenon is black smoke;

5. The inner cylinder liner and piston ring of the diesel engine are seriously worn. The ellipticity of the cylinder, the taper, the clearance between the piston and the cylinder, the ellipticity of the crankshaft journal and the connecting rod journal exceed the specified limit;

Other serious serious phenomena of generator set, such as exhaust pipe flushing, serious problem of generator, unit use more than 10 years