Remove fan housing. Unable to get crank to rotate, so had to cut through rods (recommended by William Wynne). Cut through rods to be able to remove cylinders. After cutting through 4, began to be able to rotate crank while cylinders 1 & 2 still attached by rod. Undid rod bolts. Unable to remove rod cap. Sawed through both remaining rods. Tapped rod bolts out using previously removed rod with bolts set on the rod bolts not coming off and tapping lightly.