Manifold Fits Leyland Tractors 245 253 502 AHM2192One New Aftermarket Replacement Exhaust Manifold for Leyland and Massey Ferguson Tractors This exhaust manifold replaces OEM part number AHM2192 (740221M1 37781571) and fits the Perkins AD3. 152 three cylinder diesel engine used in Leyland and Massey Ferguson tractors. It features a 90 degree elbow outlet that routes exhaust through the side panel. This is the later "new type" manifold, fitted to Perkins Leyland engines from serial number 152U 117837