 
                                    
                                 
                                    
                                 
                                    
                                 
                                    
                                Bearing piston, crankshaft, camshaft and other moving parts, maintaining sealing to ensure combustion pressure, built-in oil channel to deliver oil to each friction pair (such as crankshaft bearing, camshaft), providing installation points for generator, water pump, turbocharger and other parts..












