Yanmar 3TNE68 Specifications
| Engine Model: Yanmar 3TNE68 |
| Engine Type: 4-cycle 3-cylinder indirect injection liquid-cooled diesel |
| Total Displacement: 47.8 cu.in (0.78 L) |
| Rated Engine Power: 20.2 Hp (15.1 kW) at 3600 rpm |
| Aspiration Type: Naturally aspirated |
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Engine Model ........... Yanmar 3TNE68
Engine Type ........... Vertical 4-cycle liquid-cooled diesel
Combustion System ........... Special swirl pre-combustion chamber
Number of Cylinders ........... 3
Engine Bore, in (mm) ........... 2.69 (68.0)
Engine Stroke, in (mm) ........... 2.85 (72.0)
Displacement, cu.in (L) ........... 47.8 (0.784)
Engine Power, hp (kW) ........... 20.2 (15.1)
Engine Speed, rpm ........... 3600
Fast Idle, rpm ........... 3225
Slow Idle, rpm ........... 1450
Aspiration Type ........... Naturally aspirated
Firing Order ........... 1-3-2
Compression Ratio ........... 23:1
Direction of Rotation ........... Counterclockwise (viewed from flywheel)
Air Cleaner Type ........... Primary and Secondary Filters
Lubrication System ........... Forced lubrication with trochoid pump
Oil Filter Type ........... Full Flow, Replaceable
Cooling System ........... Liquid-cooled with radiator
Cooling Fan Type ........... Pusher
Starting system ........... Electric Starter
Electrical System Rating, Volts ........... 12
Fuel System ........... Indirect injection
Fuel Pump Type ........... Mechanical
Governor Type ........... Mechanical, centrifugal
Fuel Filter Type ........... Replaceable element
Fuel Type ........... Diesel fuel
Overall Width, in (mm) .......... 15.9 (401)
Overall Height, in (mm) .......... 19.6 (496)
Overall Depth, in (mm) .......... 18.7 (474)
Net Weight, lbs (kg) .......... 178 (81)
Cylinder bore inside diameter (Std), mm (in) .......... 68.00-68.03 (2.6877-2.6889)
Cylinder bore inside diameter (Wear limit), mm (in) .......... 68.20 (2.6957)
Piston outside diameter (Std), mm (in) .......... 67.96-67.99 (2.6862-2.6874)
Piston outside diameter (Wear limit), mm (in) .......... 67.90 (2.6838)
Clearance between piston and cylinder, mm (in) .......... 0.03-0.06 (0.0010-0.0022)
Piston pin outside diameter, mm (in) .......... 19.99-20.00 (0.7902-0.7905)
Piston pin bore diameter, mm (in) .......... 20.00-20.01 (0.7905-0.7908)
Piston pin to piston pin bore clearance, mm (in) .......... 0.00-0.02 (0.0000-0.0007)
Piston pin bushing inside diameter, mm (in) .......... 20.025-20.038 (0.7915-0.7920)
Piston pin to piston pin bushing clearance, mm (in) .......... 0.025-0.047 (0.0010-0.0019)
Top ring groove width, mm (in) .......... 1.550-1.570 (0.0613-0.0621)
Top ring width, mm (in) .......... 1.470-1.490 (0.0581-0.0589)
Top ring side clearance, mm (in) .......... 0.060-0.100 (0.0024-0.0040)
Top ring end gap, mm (in) .......... 0.100-0.250 (0.0040-0,0099)
Second ring groove width, mm (in) .......... 1.540-1.555 (0.0609-0.0615)
Second ring width, mm (in) .......... 1.430-1.450 (0.0565-0.0573)
Second ring side clearance, mm (in) .......... 0.090-0.125 (0.0036-0.0049)
Second ring end gap, mm (in) .......... 0.150-0.350 (0.0059-0.0138)
Oil ring groove width, mm (in) .......... 3.010-3.025 (0.1190-0.1196)
Oil ring width, mm (in) .......... 2.970-2.990 (0.1174-0.1182)
Oil ring side clearance, mm (in) .......... 0.020-0.055 (0.0008-0.0022)
Oil ring end gap, mm (in) .......... 0.150-0.350 (0.0059-0.0138)
Crankpin bushing inside diameter, mm (in) .......... 39.000-39.016 (1.5415-1.5421)
Crankpin metal thickness, mm (in) .......... 1.487-1.500 (0.0588-0.0593)
Crankpin outside diameter, mm (in) .......... 35.970-35.980 (1.4217-1.4221)
Crankpin to crankpin bushing clearance, mm (in) .......... 0.033-0.059 (0.0013-0.0023)
Crankshaft journal outside diameter, mm (in) .......... 39.970-39.980 (1.5798-1.5802)
Crankshaft bearing metal thickness, mm (in) .......... 1.487-1.500 (0.0588-0.0593)
Crank journal to bushing oil clearance, mm (in) .......... 0.033-0.059 (0.0013-0.0023)
Crankshaft journal bend, mm (in) .......... 0.020 (0.0008)
Cylinder head combustion surface distortion, mm (in) .......... 0.05 (0.0020)
Intake valve seat angle, degrees .......... 120
Exhaust valve seat angle, degrees .......... 90
Intake valve seat width, mm (in) .......... 1.15 (0.0455)
Exhaust valve seat width, mm (in) .......... 1.41 (0.0557)
Intake valve stem outside diameter, mm (in) .......... 5.46-5.48 (0.2158-0.2164)
Intake valve guide inside diameter, mm (in) .......... 5.50-5.52 (0.2174-0.2180)
Intake valve stem to guide clearance, mm (in) .......... 0.03-0.06 (0.0010-0.0022)
Exhaust valve stem outside diameter, mm (in) .......... 5.45-5.46 (0.2152-0.2158)
Exhaust valve guide inside diameter, mm (in) .......... 5.50-5.52 (0.2174-0.2180)
Exhaust valve stem to guide clearance, mm (in) .......... 0.04-0.07 (0.0016-0.0028)
Valve guide projection, mm (in) .......... 7.00 (0.2767)
Intake valve sinking depth, mm (in) .......... 0.30-0.50 (0.0119-0.0198)
Exhaust valve sinking depth, mm (in) .......... 0.75-0.95 (0.0296-0.0375)
Thickness of intake valve head, mm (in) .......... 0.85-1.15 (0.0336-0.0455)
Thickness of exhaust valve head, mm (in) .......... 0.95-1.25 (0.0375-0.0494)
Intake valve timing (Open), degrees .......... 50-15
Intake valve timing (Close), degrees .......... 37-47
Exhaust valve timing (Open), degrees .......... 37-47
Exhaust valve timing (Close), degrees .......... 5-15
Valve spring free length, mm (in) .......... 28.00 (1.1067)
Intake and exhaust valve clearance, mm (in) .......... 0.15-0.25 (0.0059-0.0099)
Rocker arm shaft outside diameter, mm (in) .......... 9.97-9.99 (0.3942-0.3947)
Rocker arm bushing inside diameter, mm (in) .......... 10.00-10.02 (0.3953-0.3960)
Rocker arm clearance, mm (in) .......... 0.01-0.05 (0.0005-0.0019)
Tappet stem outside diameter, mm (in) .......... 17.95-17.97 (0.7095-0.7102)
Tappet guide hole inside diameter, mm (in) .......... 18.00-18.02 (0.7115-0.7122)
Tappet clearance, mm (in) .......... 0.03-0.07 (0.0013-0.0027)
Camshaft journal outside diameter (Gear), mm (in) .......... 35.940-35.960 (1.4206-1.4213)
Camshaft oil clearance (Gear), mm (in) .......... 0.040-0.085 (0.0016-0.0034)
Camshaft journal outside diameter (Center), mm (in) .......... 35.910-35.935 (1.4194-1.4204)
Camshaft oil clearance (Center), mm (in) .......... 0.065-0.115 (0.0026-0.0045)
Camshaft journal outside diameter (Flywheel), mm (in) .......... 35.940-35.960 (1.4206-1.4213)
Camshaft oil clearance (Flywheel), mm (in) .......... 0.040-0.125 (0.0016-0.0049)
Engine oil type .......... SAE 10W-40, 5W-30
Engine oil capacity, qt (L) .......... 2.5 (2.4)
Coolant capacity, qt (L) .......... 3.7 (3.5)
Fuel Injection Timing (FlD, BTDC) deg ........... 14±1
Fuel injection Pressure, MPa ........... 11.8
Compression Pressure, MPa ........... 3.24±0.1
Intake Valve Clearance, in (mm) ........... 0.008 (0.02)
Exhaust Valve Clearance, in (mm) ........... 0.008 (0.02)
Oil filter change interval .......... Every 200 hours
Oil change interval .......... Every 200 hours
Fuel filter change interval .......... Every 500 hours
Cylinder head bolt (M8x1.25), Nm (lb-ft) ........... 37-41 (28-30)
Connecting rod bolt (M7x1.0), Nm (lb-ft) ........... 23-28 (17-20)
Flywheel clamping bolt (M10x1.25), Nm (lb-ft) ........... 80-86 (59-64)
Metal cap clamping bolt (M9x1.25), Nm (lb-ft) ........... 52-56 (38-41)
Crankshaft V-pulley clamping bolt (M12x1,5), Nm (lb-ft) ........... 113-123 (83-90)
Fuel injection nozzle nut (M20x1.5), Nm (lb-ft) ........... 49-53 (36-39)
Glow plug (M10x1.25), Nm (lb-ft) ........... 15-20 (11-15)
Stub shaft bolt (M10x1.5), Nm (lb-ft) ........... 54-64 (40-47)
Governor weight support nut (M12x1.25), Nm (lb-ft) ........... 69-74 (51-54)
High pressure pipe sleeve clamping nut (M12x1.5), Nm (lb-ft) ........... 29-34 (22-25)
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