Cleaning of Exhaust Gas Turbocharger for Diesel Generator Set

Due to the high speed of the exhaust turbocharger rotor and the precision of its components, it is important to be familiar with the structural characteristics of the turbocharger when using and maintaining it. Taking the domestically produced 135 turbocharged diesel engine J11 series as an example, Dingbo Electric will share with you the specific methods for cleaning and inspecting the exhaust turbocharger.

Cleaning of exhaust gas turbocharger

(1) Corrosive cleaning solutions are not allowed to clean various components.

(2) Soak the parts in cleaning solution to make them soft due to the accumulation of carbon and sediment. Among them, the thick layer of carbon deposits on the side wall of the turbine end in the return oil chamber of the intermediate shell must be completely removed.

(3) Only plastic scraper or bristle brush can be used to clean or scrape the accumulated dirt on aluminum and copper parts.

(4) If steam shock cleaning is used, the shaft neck and other bearing surfaces should be protected.

(5) Use compressed air to clean the lubricating oil channels on all components.

Inspection of exhaust gas turbocharger: Do not clean any parts before visual inspection to analyze the cause of damage. List the main components to be inspected below.

(1) Observe the wear of the floating ring end face and inner and outer surfaces of the floating bearing. In general, after long-term operation, the lead tin layer deposited on the inner and outer surfaces still exists, while the wear period on the outer surface is longer than that on the inner surface, and there are slight wear marks on the flat surface with oil grooves. These are all normal conditions. The grooves shot out on the working surface of the floating ring are caused by unclean lubricating oil. If the surface scratches are severe or exceed the wear limit after measurement, it is recommended to replace the floating ring with a new one.

(2) Observe whether there are any scratches or carbon deposits on the surfaces adjacent to the back of the compressor impeller and the back of the turbine impeller in the middle shell. If there is a phenomenon of spraying, significant wear on the floating bearing, or damage to the surface of the bearing inner hole seat, it is necessary to use a corresponding grinding rod to grind the inner hole or gently wipe the inner hole surface with metallographic sand to remove the traces of copper and lead substances adhered to the inner hole surface. Only after passing the measurement can it be continued to be used, and the reasons for the above adverse conditions should be analyzed.

(3) The turbine rotates on the shaft and on the working shaft neck. When touching its working surface with your fingers, you should not feel any obvious grooves; Observe the accumulation of carbon at the sealing ring groove of the turbine end and the wear of the side wall of the ring groove; Observe whether the inlet and outlet edges of the turbine blades are bent or broken; Whether there are cracks at the edge of the blade outlet and whether there are curled edges and burrs at the top of the blade caused by rubbing; Whether there are any scratches or abrasions on the back of the turbine blades.

(4) Check the back of the compressor impeller and the tip of the blade for any signs of rubbing; Check whether the blades are bent or broken; Check for cracks and damage from foreign objects on the edges of the blade inlet and outlet.

(5) Inspect the circular arc parts of the bladeless snail shell and compressor shell for any rubbing or foreign object abrasion. Pay attention to observing the degree of oil deposition on the surface of each channel and analyze the reasons for the above-mentioned adverse conditions.

(6) The elastic sealing ring should be inspected for wear and carbon accumulation on both sides of the working ring. The thickness and open clearance of the measuring ring in its free state should not be less than 2mm. If it is less than the above values and the thickness of the ring exceeds the specified wear limit, it should be replaced.

(7) The thrust plate and thrust bearing should not have obvious grooves that can be felt by fingers on the working surface. At the same time, check whether the oil inlet hole of the thrust bearing is blocked, and measure the axial thickness of each component to ensure it meets the specified size range. If there are obvious wear marks on the working surface of the thrust plate but it does not exceed the wear limit, the other unworn surface of the two thrust plates can be installed in sequence as the working surface during reinstallation.

(8) Check for wear at the contact area between the elastic sealing ring and the seat hole on the turbine end of the compressor end sealing plate and intermediate shell.

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