Abstract: The wobble plate engine mechanism includes a cylinder block and mainshaft; a drive hub obliquely mounted for rotation with the mainshaft; a wobble plate rotatable around the hub; cylinders spaced around the mainshaft; and a piston moveable in each cylinder and couple to arms of the wobble plate. Piston and arm couplings comprises a cross-head reciprocable in a piston bore and a gudgeon pin moveable end-wise in a cross-head bore; the cross-head bore and ends of the pin defining cavities so lubricant access, under some operating conditions, dampens that end-wise movement. Means for shifting the wobble plate axis along the mainshaft includes a drawing member coupled to the mainshaft and rotatable on the block to draw the mainshaft, a rotatable actuator shaft and a drive train between the drawing member and actuator shaft. Means for varying the drive hub angle is pivotally connected to the hub and mainshaft on respective sides of the mainshaft.