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Yanmar 4TNE94 Specifications

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• Yanmar 4TNE94 Engine Specifications
• Yanmar 4TNE94 Engine Troubleshooting

Engine Model ................ Yanmar 4TNE94
Engine Type ................ 4-cycle vertical in-line liquid-cooled diesel
Number of Cylinders ................ 4
Total Displacement, cu.in (L) ................ 169.6 (2.78)
Cylinder Bore, in (mm) ................ 3.70 (94.0)
Piston Stroke, in (mm) ................ 3.94 (100.0)
Rated Engine Power, hp (kW) ................ 57.7 (43.0)
Rated Engine Speed, rpm ................ 2500
High Idle Speed, rpm ................ 2725±25
Aspiration Type ................ Naturally aspirated
Compression Ratio ................ 20.8:1
Firing Order ................ 1-3-4-2
Direction of Rotation ................ Counterclockwise (Flywheel)
Combustion System ................ Ball type swirl chamber
Air Cleaner Type ................ Dry, dual element
Lubricating System ................ Forced lubrication with trochoid pump
Oil Filter Type ................ Full flow
Cooling System ................ Liquid-cooled with radiator
Electrical System Rating, Volts ................ 12
Charging System ................ Alternator

Fuel System ................ Direct injection
Fuel Injection Pump ................ Mechanical
Governor Type ................ Mechanical, centrifugal
Fuel Filter Type ................ Replaceable element
Fuel Type ................ Diesel Fuel

Overall Width, in (mm) ................ 20.1 (510)
Overall Height, in (mm) ................ 27.2 (690)
Overall Length, in (mm) ................ 28.3 (720)
Dry Weight, lbs (kg) ................ 491 (223)

Cylinder Bore I.D (Standard), in (mm) ................ 3.7008-3.7020 (94.000-94.030)
Cylinder Bore I.D (Wear Limit), in (mm) ................ 3.7059 (94.130)
Crankshaft End Play, in (mm) ................ 0.0043-0.0083 (0.11-0.21)
Crankshaft Bearing Journal O.D, in (mm) ................ 2.5572-2.5576 (64.952-64.962)
Crankshaft Bearing I.D, in (mm) ................ 2.5590-2.5598 (65.000-65.020)
Connecting Rod Journal O.D, in (mm) ................ 2.2816-2.2820 (57.952-57.962)
Connecting Rod Bearing I.D, in (mm) ................ 2.2835-2.2845 (58.000-58.026)
Connecting Rod Small End O.D (Standard), in (mm) ................ 1.1806-1.1811 (29.987-30.000)
Connecting Rod Small End O.D (Wear Limit), in (mm) ................ 1.1795 (29.959)
Piston O.D (Standard), in (mm) ................ 3.6982-3.6994 (93.935-93.965)
Piston O.D (Wear Limit), in (mm) ................ 3.6968 (93.900)
Piston Pin Bore I.D (Standard), in (mm) ................ 1.1811-1.1815 (30.000-30.009)
Piston Pin Bore I.D (Wear Limit), in (mm) ................ 1.1826 (30.039)
Piston Pin O.D (Standard), in (mm) ................ 1.1807-1.1811 (29.989-30.000)
Piston Pin O.D (Wear Limit), in (mm) ................ 1.1795 (29.959)
Piston Pin Oil Clearance, in (mm) ................ 0.0008 (0.020)
Top Ring Groove Width, in (mm) ................ 0.0803-0.0811 (2.040-2.060)
Top Ring Width, in (mm) ................ 0.0764-0.0772 (1.940-1.960)
Top Ring Groove Clearance, in (mm) ................ 0.0031-0.0047 (0.080-0.120)
Top Ring End Gap, in (mm) ................ 0.0098-0.0177 (0.250-0.450)
Second Ring Groove Width, in (mm) ................ 0.0819-0.0825 (2.080-2.095)
Second Ring Width, in (mm) ................ 0.0776-0.0783 (1.970-1.990)
Second Ring Groove Clearance, in (mm) ................ 0.0035-0.0049 (0.090-0.125)
Second Ring End Gap, in (mm) ................ 0.0177-0.0256 (0.450-0.650)
Oil Ring Groove Width, in (mm) ................ 0.1187-0.1193 (3.015-3.030)
Oil Ring Width, in (mm) ................ 0.1169-0.1177 (2.970-2.990)
Oil Ring Groove Clearance, in (mm) ................ 0.0010-0.0024 (0.025-0.060)
Oil Ring End Gap, in (mm) ................ 0.0098-0.0177 (0.250-0.450)

Cylinder Head Surface (Flatness, Standard), in (mm) ................ 0.0020 (0.05)
Cylinder Head Surface (Flatness, Wear Limit), in (mm) ................ 0.0059 (0.15)
Intake Valve Seat Angle, deg ................ 120
Exhaust Valve Seat Angle, deg ................ 90
Intake Valve Guide I.D, in (mm) ................ 0.3156-0.3161 (8.015-8.030)
Intake Valve Stem O.D, in (mm) ................ 0.3135-0.3142 (7.965-7.980)
Exhaust Valve Guide I.D, in (mm) ................ 0.3156-0.3161 (8.015-8.030)
Exhaust Valve Stem O.D, in (mm) ................ 0.3132-0.3140 (7.955-7.970)
Intake Valve Stem to Guide Clearance, in (mm) .................. 0.035-0.065 (0.0014-0.0026)
Exhaust Valve Stem to Guide Clearance, in (mm) .................. 0.045-0.075 (0.0018-0.0030)
Valve Spring Free Length (Standard), in (mm) ................ 1.874 (47.50)
Valve Spring Free Length (Wear Limit), in (mm) ................ 1.874 (47.50)
Intake Cam Lobe Height, in (mm) ................ 1.674-1.679 (42.435-42.565)
Exhaust Cam Lobe Height, in (mm) ................ 1.674-1.679 (42.435-42.565)
Camshaft End Play, in (mm) ................ 0.0020-0.0079 (0.05-0.20)
Camshaft O.D (Gear End), in (mm) ................ 1.9655-1.9665 (49.925-49.950)
Camshaft O.D (Center), in (mm) ................ 1.9650-1.9659 (49.910-49.935)
Camshaft O.D (Flywheel End), in (mm) ................ 1.9655-1.9665 (49.925-49.950)

Engine Oil Type (Summer) .................. SAE 10W-30, 15W-40
Engine Oil Type (Winter) .................. SAE 5W-20, 5W-30
API Service Classifications .................. CD or higher
Engine Oil Capacity, qts (L) .................. 10.7 (10.2)
Cylinder Compression, psi (MPa) .................. 497 (3.43)
Intake Valve Clearance, mm (in) .................. 0.15-0.25 (0.006-0.010)
Exhaust Valve Clearance, mm (in) .................. 0.15-0.25 (0.006-0.010)
Fuel Injection Timing, deg ................ 10-12, BTDC
Fuel Injection Pressure, psi (MPa) ................ 3117-3277 (21.5-22.6)
Coolant Capacity (Engine), qts (L) .................. 4.4 (4.2)

Cylinder Head Bolt, ft-lb (Nm) ................ 76-83 (103.1-112.9)
Connecting Rod Bolt, ft-lb (Nm) ................ 40-43 (53.9 -58.8)
Flywheel Bolt, ft-lb (Nm) ................ 137-152 (186.2 -205.8)
Main Bearing Cap Bolt, ft-lb (Nm) ................ 80-87 (108.1-117.9)
Crankshaft Pulley Bolt, ft-lb (Nm) ................ 80-94 (107.9-127.5)
Oil Pump Cover Screw, ft-lb (Nm) ................ 4.8-6.3 (6.5-8.5)
Oil Drain Plug, ft-lb (Nm) ................ 14-17 (19.6-23.5)
Fuel Injector Bolt, ft-lb (Nm) ................ 18-21 (24.4-28.4)
Fuel Pump Drive Gear Nut, ft-lb (Nm) ................ 83-90 (113-123)
Fuel Return Line Bolts, ft-lb (Nm) ................ 6-8 (7.8-9.8)
Fuel Pump Mounting Nuts, ft-lb (Nm) ................ 17-21 (23-28)
Fuel Injector Nozzle Case Nut, ft-lb (Nm) ................ 30-33 (39.2-44.1)

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