Gardner LW (Full version) Instruction Manual. This is the rare LW Gardner engine Instruction Manual that contains the technical information that is required to rebuild the LW Gardner Engine. This is the most comprehensive LW manual that Gardner produced. NOTE Gardner engines were commercial engines built and sold to customers who made profit from the use of these engines. These engines were never intended to be repaired in the DIY sense by the home mechanic; and as such the manual assumes that the reader is a time served Mechanical Engineer with the qualification and skill or at the very least a heavy diesel mechanic. This manual also contains technical information on the Marine engine version.