The only marine tune-up manuals to be certified by the engine manufacturers as accurate and complete. Seloc uses easy to understand step-by-step illustrated procedures for the complete dismantling repair and assembling of marine powerplants. The illustrations are mainly photographs taken during the actual work. Each numbered step procedure is accompanied by the same numbered photograph or illustration making Seloc manuals easy to follow. Seloc chapters are divided into complete areas of work such as electrical ignition fuel etc. making it much easier to find the procedure for the job to be performed.