Exhaust Manifold Fits Allis Chalmers Tractor 160 6040One New Aftermarket Replacement Exhaust Manifold for Allis Chalmers and Massey Ferguson Tractors with Perkins AD3. 152 Diesel Engine This aftermarket exhaust manifold is a direct replacement for the Perkins AD3. 152 3 cylinder diesel engine, featuring a 90 degree elbow outlet. It channels exhaust gases away from the engine block and is a common service item on Allis Chalmers, Massey Ferguson, and Leyland tractors equipped with the Perkins 3 cylinder