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Yanmar 4TNV94FHT Engine

The Yanmar 4TNV94FHT is a 4-stroke 4-cylinder direct injection turbocharged liqiud-cooled diesel engine from TNV series. A 186.3 cu.in (3.05 L) engine has a cylinder bore of 3.70" (94 mm), piston stroke of 4.33" (110 mm), and rated power of 103.5 Hp (77.2 kW) at 2200 rpm. The compression ratio rating is 17.6:1. The Yanmar 4TNV94FHT engine is equipped with a common rail fuel system, electric fuel injection pump, forced lubrication system, dual element air cleaner, and starting system with electric starter. The operating weight is 814 lbs (370 kg).

General Technical Data

Engine Specs

Engine Model ................ Yanmar 4TNV94FHT
Engine Type ................ 4-cycle vertical four-cylinder 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) ................ 103.5 (77.2)
Rated Engine Speed, rpm ................ 2200
Aspiration Type ................ Turbocharged
Compression Ratio ................ 17.6:1
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
Emission Level .................. Tier 4
Starting System .................. Electric Starter
Electrical System Rating, Volts ................ 12
Charging System ................ Alternator

Fuel System

Fuel System .................. Direct injection
Injection System .................. High-pressure common rail
Fuel Pump Type .................. Electric
Fuel Filter Type .................. Replaceable element
Governor Type .................. Electronic
Fuel Type .................. Diesel Fuel

Dimensions and Weight

Overall Width, in (mm) ................ 29.6 (750)
Overall Height, in (mm) ................ 30.8 (780)
Overall Length, in (mm) ................ 45.6 (1155)
Dry Weight, lbs (kg) ................ 814 (370)

Maintenance Data

Engine Oil

Engine Oil Type (Summer) .................. SAE 10W-30, 15W-40
Engine Oil Type (Winter) ......................... SAE 5W-30
API Service Classifications ......................... CD, CF, CF-4, or CI-4
Engine Oil Capacity, qts (L) .................. 13.1 (12.5)

Cylinder and Valves

Compression Pressure, psi (MPa) .................. 483-513 (3.33-3.53)
Intake Valve Clearance, in (mm) .................. 0.006-0.010 (0.15-0.25)
Exhaust Valve Clearance, in (mm) .................. 0.006-0.010 (0.15-0.25)

Oil Pressure and Coolant Capacity

Lubrication Pressure (1500 rpm), psi (MPa) .................. 42-57 (0.29-0.39)
Lubrication Pressure (2500 rpm), 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) ................ 0.0051-0.0091 (0.13-0.23)
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)
Crankshaft Bearing Oil Clearance, in (mm) ................ 0.0015-0.0027 (0.038-0.068)
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 Oil Clearance, in (mm) ................ 0.0015-0.0029 (0.038-0.074)
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 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 Clearance, in (mm) .................. 0.006-0.010 (0.15-0.25)
Exhaust Valve Clearance, in (mm) .................. 0.006-0.010 (0.15-0.25)
Intake Valve Seat Angle, deg ................ 120
Exhaust Valve Seat Angle, deg ................ 90
Intake Valve Guide I.D, in (mm) ................ 0.2756-0.2762 (7.000-7.015)
Intake Valve Stem O.D, in (mm) ................ 0.2734-0.2740 (6.945-6.960)
Exhaust Valve Guide I.D, in (mm) ................ 0.2756-0.2762 (7.000-7.015)
Exhaust Valve Stem O.D, in (mm) ................ 0.2732-0.2738 (6.940-6.955)
Intake Valve Stem Bend, in (mm) .................. 0.0016-0.0028 (0.040-0.070)
Exhaust Valve Stem Bend, in (mm) .................. 0.0018-0.0030 (0.045-0.075)
Intake Valve Spring Free Length (Standard), in (mm) ................ 1.5630 (39.70)
Intake Valve Spring Free Length (Wear Limit), in (mm) ................ 1.5433 (39.20)
Exhaust Valve Spring Free Length (Standard), in (mm) ................ 1.5630 (39.70)
Exhaust Valve Spring Free Length (Wear Limit), in (mm) ................ 1.5433 (39.20)
Intake Cam Lobe Height, in (mm) ................ 1.7087-1.7165 (43.400-43.600)
Exhaust Cam Lobe Height, in (mm) ................ 1.7087-1.7165 (43.400-43.600)
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)
Rocker Arm Shaft Bore I.D (Standard), in (mm) ................ 0.7283-0.7291 (18.500-18.520)
Rocker Arm Shaft Bore I.D (Wear Limit), in (mm) ................ 0.7311 (18.57)
Rocker Arm Shaft O.D (Standard), in (mm) ................ 0.7272-0.7280 (18.470-18.490)
Rocker Arm Shaft O.D (Wear Limit), in (mm) ................ 0.7260 (18.44)

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) ................ 83-91 (112.7-122.7)
Fuel Injector Bolt, ft-lb (Nm) ................ 18-21 (24.4-28.4)
Fuel Pump Drive Gear Nut, ft-lb (Nm) ................ 83-90 (113-123)
High-Pressure Fuel Lines Bolt, ft-lb (Nm) ................ 22-25 (29.4-34.3)
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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