A-31431521-AI EXHAUST VALVEOne New Aftermarket Replacement Exhaust Valve for Perkins 3. 152 Series Diesel Engines This aftermarket replacement exhaust valve fits Perkins 3 cylinder diesel engines in the 3. 152 family, including the A3. 152, AD3. 152, and D3. 152 series. It is used in the cylinder head valvetrain assembly and controls exhaust gas release from the combustion chamber. This valve is commonly required during cylinder head rebuilds when valves are bent, sunk, or worn