1.2 Data and specifications 1.2.1 Data and specifications 20 Engine model Item 4DA1 4DA1-1 Engine type Natural admission (NA) Turbocharged Inter-cooling (TCI) Four strokes, high mounted valve, water cooling Combustion chamber type ω type direct injection Cylinder liner type Dry type, thin-wall chrome-plated steel cylinder liner Cylinder number - cylinder bore stroke mm 4— 93×102 Number of piston ring 2 gas rings, 1 oil ring Total piston displacement L 2.771 Compression ratio 18.2 17.5 Design compression pressure kPa 3040 Engine weight (net) kg 230 240 Fuel injection sequence 1— 3— 4— 2 Fuel injection timing 16to the top dead center (before) 12to the top dead center (before) Required fuel type Ambient temperature Above 4 ℃ Above -5 ℃ Above -14 ℃ Above -29 ℃ Light diesel fuel type 0 # -10 # -20 # -35 # Idle speed r/min 750±50 Valve clearance (cold) Intake valve mm 0.30～0.40 Exhaust valve mm 0.30～0.40 Valve clearance (hot) Intake valve mm 0.30 Exhaust valve mm 0.30 Intake valve Open (before top dead center) 24.5 Close (after bottom top dead center) 55.5 Exhaust valve Open (before bottom top dead center) 54 Close (after top dead center) 26 Lubricant system Lubrication method Pressure feed lubrication and spray lubrication Required oil (class AP1) CF-4 15W-40 Oil pump type External gearing Oil filter type Full-flow type, paper element, replaceable Oil volume (including oil filter) L 6 Oil cooler type Water cooling