Crankcase ventilation adapter Volvo B230 Crankcase adapter for rebuilding to external oil trap / oil catch tank. A direct replacement for the original oil trap where you have an external oil trap. Fits with original gaskets and has perfect play against the pump shaft that is important. Fits cars with B230 / B23 red block. Volvo 240 Volvo 740 Volvo 940 Made of Aluminum. With this adapter, the crankcase pressure is kept to normal levels despite high power outputs where blowby occurs at the piston rings. It also allows the turbocharger oil return to drain properly and thereby extends the life of the turbo. The engine is allowed to work without back pressure and saves the o-ring gaskets that otherwise brakes because of high crankcase pressure/ pressure pulses. This adapter is made to be mounted directly on the engine block with original gaskets without modification or other settings. Only attach a crankcase / oil catch tank is to the crank case adapter to collect the oil mist that is being