________________________________________________________________________________

Yanmar 4TNE94L Engine

The Yanmar 4TNE94L is a four-cycle vertical four-cylinder indirect injection naturally aspirated liqiud-cooled diesel engine from TNE series. A 186.3 cubic inches (3.1 L) engine has a cylinder bore of 3.70" (94 mm), piston stroke of 4.33" (110 mm), and rated power of 47.3 Hp (35.3 kW) at 2200 rpm. The compression ratio is 22.5:1. The Yanmar 4TNE94L 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 495 lbs (225 kg).

General Technical Data

Engine Specs

Engine Model ................ Yanmar 4TNE94L
Engine Type ................ 4-cycle vertical in-line liquid-cooled diesel
Number of Cylinders ................ 4
Total Displacement, cu.in (L) ................ 186.3 (3.05)
Cylinder Bore, in (mm) ................ 3.70 (94.0)
Piston Stroke, in (mm) ................ 4.33 (110.0)
Rated Engine Power, hp (kW) ................ 47.3 (35.3)
Rated Engine Speed, rpm ................ 2200
High Idle Speed, rpm ................ 2450±25
Low Idle Speed, rpm ................ 810±25
Aspiration Type ................ Naturally aspirated
Compression Ratio .................. 22.5:1
Firing Order ................ 1-3-4-2
Direction of Rotation ................ Counterclockwise (Flywheel Side)
Air Cleaner Type ................ Dry, dual element
Lubricating System ................ Forced lubrication with trochoid pump
Oil Filter Type ................ Full flow
Cooling System ................ Liquid-cooled with radiator
Emission Level .................. Tier 3
Electrical System Rating, Volts ................ 12
Charging System ................ Alternator

Fuel System

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

Dimensions and Weight

Overall Length, in (mm) ................ 27.9 (710)
Overall Width, in (mm) ................ 20.3 (515)
Overall Height, in (mm) ................ 29.9 (760)
Dry Weight, lbs (kg) ................ 495 (225)

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) .................. 9.7 (9.2)

Cylinder and Valves

Cylinder Compression, psi (MPa) .................. 428 (2.95)
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)

Oil Pressure and Coolant Capacity

Lubrication Pressure (Maximum), psi (MPa) .................. 86 (0.59)
Lubrication Pressure (Rated), psi (MPa) .................. 42-57 (0.29-0.39)
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 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)
Piston O.D (Standard), in (mm) ................ 3.6986-3.6990 (93.945-93.955)
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 to Piston Pin Oil Clearance, in (mm) ................ 0.0008 (0.020)
Top Ring Width, in (mm) ................ 0.0764-0.0772 (1.940-1.960)
Top Ring Side 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 Width, in (mm) ................ 0.0776-0.0783 (1.970-1.990)
Second Ring Side 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 Width, in (mm) ................ 0.1169-0.1177 (2.970-2.990)
Oil Ring Side 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)
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)

________________________________________________________________________________________

• Yanmar Engines Specifications
  
• Yanmar 4TNE84T Specs
  
• Yanmar 4TNE88 Specs
  
• Yanmar 4TNE92 Specs
  
• Yanmar 4TNE94 Specs
  
• Yanmar 4TNE98 Specs
  

________________________________________________________________________________

________________________________________________________________________________________

_______________________________________________________________________________________

________________________________________________________________________________________

________________________________________________________________________________________