To make the center line of turbocharger oil inlet and outlet as vertical as possible to ensure a smooth oil return.

Make sure a good sealing from air filter to compressor,compressor to engine air inlet pipe,turbocharger to engine exhaust pipe and other pipes,otherwise it will cause air leakage and whistling.

When reinstalling the turbocharger,make sure to change the sealing gasket for oil inlet&outlet and air inlet&outlet of turbocharger in order to ensure a good sealing.

Make sure not to let any abnormal object go into turbocharger or engine air inlet&outlet system.