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Yanmar 4TNE94 Engine

The Yanmar 4TNE94 is a four-cycle vertical four-cylinder direct injection naturally aspirated liqiud-cooled diesel engine from TNE series. A 169.6 cubic inches (2.8 L) engine has a cylinder bore of 3.70" (94 mm), piston stroke of 3.94" (100 mm), and rated power of 57.7 Hp (43 kW) at 2500 rpm. The compression ratio is 20.8:1. The Yanmar 4TNE94 engine is equipped with a mechanical fuel injection pump, air cleaner with dual element, forced lubrication with trochoid pump, and starting system with electric starter. The operating weight is 491 lbs (223 kg).

General Technical Data

Engine Specs

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 Side)
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

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

Dimensions and Weight

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)

Maintenance Data

Engine Oil

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 and Valves

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 System and Coolant Capacity

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)

Service Specifications

Cylinder Block

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 and Valves

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 Valve Guide Clearance, in (mm) .................. 0.035-0.065 (0.0014-0.0026)
Exhaust Valve Stem to Valve 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 (Intermediate), 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)

Tightening Torques

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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• Yanmar Engines Specifications
  
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