This Yanmar 1-2-3 Cylinder Diesel Inboard Repair Manual by Clymer 1980-1999 provides detailed service information, step-by-step repair instruction and maintenance specifications for 1, 2 and 3 cylinder Yanmar diesel inboard including 1GM, 1GM10, 2 GM, 2GMF, 2GM20, 2GM20F, 3GM, 3GMF, 3GMD, 3GM30, 3GM30F, 3HM, 3HMF, 3HM35, and 3HM35F engines.