🏷️ Basic Information Identification Make: YANMAR Model: 3JH2L, 3JH2L-T, 4JH2L-T, 4JH2L-HT Generation: Early 1990s to early 2000s (estimated based on common availability) 📋 Manual Details Information Manual Type: Service Repair Manual Language: English Format: Downloadable PDF ⚙️ Engine Specifications General Engine Type: Marine Diesel Engine Aspiration: Naturally Aspirated (3JH2L, 4JH2L-HT) and Turbocharged (3JH2L-T, 4JH2L-T) Displacement Displacement: 3JH2L: 1.4 liters (1352 cc); 4JH2L-T: 1.9 liters (1904 cc) Power Bore X Stroke: 3JH2L: 84 x 84 mm; 4JH2L-T: 84 x 87 mm Compression Ratio: Approx. 21.5:1 (typical for these models) Power Output: 3JH2L: Approx. 30-36 HP; 3JH2L-T: Approx. 38-45 HP; 4JH2L-T: Approx. 50-57 HP; 4JH2L-HT: Approx. 62-68 HP (specific ratings vary by model and application) Torque: Variable depending on model and specific rating. 🔧 Transmission Drive Type: Marine Gearbox (specific models vary, e.g., KM3P-1, KM4A-1) Gear Ratio: Variable depending on gearbox option (e.g., 2.0:1, 2.3:1, 2.6:1) 📐 Dimensions Physical Length: Approx. 600-700 mm (engine block only, varies with gearbox) Width: Approx. 400-500 mm (engine block only, varies with gearbox) Height: Approx. 500-600 mm (engine block only, varies with gearbox) Weight: Approx. 150-200 kg (dry weight, without gearbox and ancillaries) 🔧 Maintenance Lubrication Oil Type: API CD or CE class diesel engine oil, SAE 15W-40 or 10W-30 (refer to manual for specific recommendations) Oil Capacity: Approx. 4.5 - 6.5 liters (including oil filter, varies by model) Cooling Cooling System: Raw Water Cooled or Freshwater Cooling with Heat Exchanger Intervals Oil Change Interval: Every 200 operating hours or annually, whichever comes first (typical) Fuel Filter Replacement: As needed or per manual recommendations, typically every few hundred hours. 📄 Electrical Starting Starting System: Electric Starter Motor (12V or 24V system) Charging Alternator: Typically 12V or 24V, 35-70 Amp (model dependent)