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Yanmar 3TNM74F Engine

The Yanmar 3TNM74F is a 4-cycle 3-cylinder indirect injection naturally aspirated liqiud-cooled diesel engine from TNM series. A 60.6 cu.in (1.0 L) engine has a cylinder bore of 2.92" (74 mm), piston stroke of 3.03" (77 mm), and rated power of 21.6 Hp (16 kW) at 3600 rpm. The compression ratio rating is 23.5:1. The Yanmar 3TNM74F engine is equipped with a mechanical fuel injection pump, forced lubrication with trochoid pump, dual element air cleaner, and starting system with electric starter. The operating weight is 194 lbs (88 kg).

General Technical Data

Engine Specifications

Engine Model .................. Yanmar 3TNM74F
Engine Type .................. 4-cycle vertical three-cylinder liquid-cooled diesel
Number of Cylinders .................. 3
Displacement, cu.in (L) .................. 60.6 (0.993)
Cylinder Bore, in (mm) .................. 2.92 (74.0)
Piston Stroke, in (mm) .................. 3.03 (77.0)
Maximum Power, hp (kW) .................. 21.6 (16.0)
Maximum Speed, rpm .................. 3600
Idling Speed, rpm .................. 2800
Aspiration Type .................. Naturally aspirated
Compression Ratio .................. 23.5:1
Firing Order .................. 1-3-2
Lubrication System .................. Forced lubrication with trochoid pump
Oil Filter Type .................. Full flow, replaceable
Air Cleaner Type .................. Dual element
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 .................. Indirect injection
Fuel Pump Type .................. Mechanical
Fuel Filter Type .................. Paper element
Governor Type .................. Mechanical, centrifugal
Fuel Type .................. Diesel fuel

Dimensions and Weight

Overall Lenght, in (mm) .................. 17.7 (450)
Overall Width, in (mm) .................. 16.4 (415)
Overall Height, in (mm) .................. 19.9 (505)
Net Weight, lbs (kg) .................. 194 (88)

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, CI-4
Engine Oil Capacity, qts (L) .................. 3.05 (2.90)

Cylinder and Valves

Compression Pressure, psi (MPa) .................. 470 (3.24)
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)

System Pressure and Coolant Capacity

Lubrication Oil Pressure, psi (MPa) .................. 41-55 (0.28-0.38)
Fuel injection Pressure, psi (MPa) .................. 1930 (13.3)
Coolant Capacity (Engine), qts (L) .................. 1.05 (1.00)

Service Specifications

Cylinder Block

Cylinder Bore Inside Diameter (Std), mm (in) .................. 74.00-74.02 (2.919-2.914)
Cylinder Bore Inside Diameter (Wear Limit), mm (in) .................. 74.20 (2.9213)
Crankshaft End Play, mm (in) .................. 0.133-0.228 (0.0052-0.0090)
Connecting Rod Journal Outside Diameter, mm (in) .................. 37.952-37.962 (1.4942-1.4946)
Connecting Rod Bearing Inside Diameter, mm (in) .................. 37.982-38.010 (1.4954-1.4965)
Main Bearing Journal Outside Diameter, mm (in) .................. 43.970-43.980 (1.7311-1.7315)
Main Bearing Inside Diameter, mm (in) .................. 44.002-44.020 (1.7324-1.7331)
Crankshaft Journal Bend, mm (in) .................. 0.020 (0.0008)
Piston Outside Diameter (Std), mm (in) .................. 73.969-73.979 (2.9122-2.9126)
Piston Outside Diameter (Wear Limit), mm (in) .................. 73.915 (2.91)
Piston to Cylinder Clearance, mm (in) .................. 0.031-0.051 (0.0012-0.0020)
Piston Pin Outside Diameter, mm (in) .................. 21.995-22.000 (0.8659-0.8661)
Piston Pin Hole Diameter, mm (in) .................. 22.000-22.009 (0.8661-0.8665)
Piston to Piston Pin Clearance, mm (in) .................. 0.014 (0.0006)
Top Ring Width, mm (in) .................. 1.47-1.49 (0.0579-0.0587)
Top Ring Side Clearance, mm (in) .................. 0.06-0.10 (0.0024-0.0039)
Top Ring End Gap, mm (in) .................. 0.15-0.30 (0.0059-0.0118)
Second Ring Width, mm (in) .................. 1.47-1.49 (0.0579-0.0587)
Second Ring Side Clearance, mm (in) .................. 0.05-0.09 (0.0020-0.0035)
Second Ring End Gap, mm (in) .................. 0.18-0.33 (0.0071-0.0130)
Oil Ring Width, mm (in) .................. 2.97-2.99 (0.1171-0.1178)
Oil Ring Side Clearance, mm (in) .................. 0.020-0.055 (0.0008-0.0022)
Oil Ring End Gap, mm (in) .................. 0.15-0.35 (0.0059-0.0138)

Cylinder Head and Valves

Cylinder Head Combustion Surface Distortion, mm (in) .................. 0.05 (0.0020)
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)
Intake Valve Seat Angle, Degrees .................. 120
Exhaust Valve Seat Angle, Degrees .................. 90
Intake Valve Stem Outside Diameter, mm (in) .................. 5.960-5.975 (0.2346-0.2352)
Exhaust Valve Stem Outside Diameter, mm (in) .................. 5.945-5.960 (0.2341-0.2346)
Intake Valve Guide Inside Diameter, mm (in) .................. 6.000-6.012 (0.2362-0.2367)
Exhaust Valve Guide Inside Diameter, mm (in) .................. 6.000-6.012 (0.2362-0.2367)
Intake Valve Stem to Valve Guide Clearance, mm (in) .................. 0.025-0.052 (0.0010-0.0020)
Exhaust Valve Stem to Valve Guide Clearance, mm (in) .................. 0.040-0.067 (0.0016-0.0026)
Intake Valve Stem Bend, mm (in) .................. 0.010 (0.0004)
Exhaust Valve Stem Bend, mm (in) .................. 0.010 (0.0004)
Intake Valve Spring Free Length, mm (in) .................. 37.8 (1.488)
Exhaust Valve Spring Free Length, mm (in) .................. 37.8 (1.488)
Intake Cam Lobe Height, mm (in) .................. 34.535-34.665 (1.3596-1.3647)
Exhaust Cam Lobe Height, mm (in) .................. 34.535-34.665 (1.3596-1.3647)
Camshaft End Play, mm (in) .................. 0.05-0.15 (0.002-0.0059)
Camshaft Journal Outside Diameter (Gear Side), mm (in) .................. 39.940-39.960 (1.5724-1.5732)
Camshaft Journal Clearance (Gear Side), mm (in) .................. 0.040-0.085 (0.0016-0.0033)
Camshaft Journal Outside Diameter (Intermediate), mm (in) .................. 39.910-39.935 (1.5713-1.5722)
Camshaft Journal Clearance (Intermediate), mm (in) .................. 0.065-0.115 (0.0026-0.0045)
Camshaft Journal Outside Diameter (Flywheel Side), mm (in) .................. 39.940-39.960 (1.5724-1.5732)
Camshaft Journal Clearance (Flywheel Side), mm (in) .................. 0.040-0.085 (0.0016-0.0033)

Tightening Torque Specs

Cylinder Head Bolt, Nm (ft-lb) .................. 59-63 (43-46)
Connecting Rod Bolt, Nm (ft-lb) .................. 22.5-27.5 (17-20)
Flywheel Bolt, Nm (ft-lb) .................. 80.5-86.5 (59-64)
Main Bearing Bolt, Nm (ft-lb) .................. 75.5-81.5 (56-60)
Crankshaft Pulley Bolt, Nm (ft-lb) .................. 113-123 (83-90)
Glow Plug, Nm (ft-lb) .................. 14.5-19.5 (11-15)
Fuel Injector, Nm (ft-lb) .................. 49-59 (36-43.5)
Fuel Injector Nozzle Case Nut, Nm (ft-lb) .................. 29-49 (21.5-36)
Fuel Pump Drive Gear Nut, Nm (ft-lb) .................. 59-69 (44-51)
Fuel Injection Pump Mounting Nut, Nm (ft-lb) .................. 23-28 (17-21)
High Pressure Fuel Injection Line Nut, Nm (ft-lb) ........ 29-34 (22-25)

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