A “Yanmar 3TNA68 1100 hrs” refers to a Yanmar 3TNA68 diesel engine that has been used for 1,100 hours. The 3TNA68 is a compact, 3-cylinder, water-cooled 4-stroke diesel engine with a 0.784-liter (or 47.8 cubic inch) displacement, commonly used in agricultural equipment, compact industrial machines, and generators. The “1100 hrs” indicates its operational time, a common metric for engine usage and potential maintenance, with 1,100 hours suggesting it is a moderately used engine for this type of power unit.