Yanmar 2TNE68 Specifications
| Engine Model: Yanmar 2TNE68 |
| Engine Type: 4-cycle 2-cylinder indirect injection liquid-cooled diesel |
| Total Displacement: 31.9 cu.in (0.52 L) |
| Rated Engine Power: 11.5 Hp (8.5 kW) at 3000 rpm |
| Aspiration Type: Naturally aspirated |
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Engine Model ........... Yanmar 2TNE68
Engine Type ........... 4-cycle 2-cylinder liquid-cooled diesel
Number of Cylinders ........... Two
Displacement, cu.in (L) ........... 31.9 (0.523)
Cylinder Bore, in (mm) ........... 2.69 (68.0)
Piston Stroke, in (mm) ........... 2.85 (72.0)
Engine Power, hp (kW) ........... 11.5 (8.5)
Engine Speed, rpm ........... 3000
Idling Speed, rpm ........... 2200
Aspiration Type ........... Naturally aspirated
Compression Ratio ........... 23:1
Firing Order ........... 1-2
Air Cleaner Type ........... Dry element
Lubrication System ........... Forced lubrication with trochoid pump
Oil Filter Type ........... Full Flow, replaceable
Cooling System ........... Liquid-cooled with radiator
Starting System ........... Electric Starter
Electrical System Rating, Volts ........... 12
Charging System ........... Alternator
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) .......... 15.2 (385)
Overall Height, in (mm) .......... 16.4 (415)
Overall Depth, in (mm) .......... 19.7 (500)
Net Weight, lbs (kg) .......... 143 (65)
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)
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)
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)
Piston pin bushing inside diameter, mm (in) .......... 20.025-20.038 (0.7915-0.7920)
Piston pin outside diameter, mm (in) .......... 19.991-20.000 (0.7902-0.7905)
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)
Piston to cylinder clearance, 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 hole diameter, mm (in) .......... 20.00-20.01 (0.7905-0.7908)
Piston to piston pin clearance, mm (in) .......... 0.02 (0.0007)
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 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 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)
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 valve 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 valve guide clearance, mm (in) .......... 0.04-0.07 (0.0016-0.0028)
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)
Valve spring free length, mm (in) .......... 28.00 (1.1067)
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)
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)
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)
Cylinder Compression, psi (MPa) .......... 470 (3.24)
Intake Valve Clearance, mm (in) .......... 0.20 (0.008)
Exhaust Valve Clearance, mm (in) .......... 0.20 (0.008)
Injection Pump Timing, deg .......... 14±1, BTDC
Fuel Injection Nozzle Pressure, MPa (psi) .......... 11.8 (1710)
Fuel Supply Pump Pressure, kPa (psi) .......... 29 (4.3)
Engine Oil Type (Summer) .......... SAE 10W-30
Engine Oil Type (Winter) .......... SAE 5W-20
API Service Classifications .......... CC or higher
Engine Oil Capacity, qts (L) .......... 2.6 (2.5)
Coolant Capacity (Engine), qts (L) .......... 3.7 (3.5)
Cylinder head bolt, Nm (lb-ft) ........... 37-41 (28-30)
Connecting rod bolt, Nm (lb-ft) ........... 23-28 (17-20)
Flywheel clamping bolt, Nm (lb-ft) ........... 80-86 (59-64)
Metal cap clamping bolt, Nm (lb-ft) ........... 52-56 (38-41)
Crankshaft V-pulley clamping bolt, Nm (lb-ft) ........... 113-123 (83-90)
Fuel injection nozzle nut , Nm (lb-ft) ........... 49-53 (36-39)
Glow plug, Nm (lb-ft) ........... 15-20 (11-15)
Stub shaft bolt, Nm (lb-ft) ........... 54-64 (40-47)
Governor weight support nut, Nm (lb-ft) ........... 69-74 (51-54)
High pressure pipe sleeve nut, Nm (lb-ft) ........... 29-34 (22-25)
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