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Yanmar 3TNV70 Engine

General Technical Data

Yanmar 3TNV70 Engine Specifications

Engine Model .......... Yanmar 3TNV70
Type .......... Vertical Inline, 3-Cylinder Diesel
Aspiration .......... Natural
Number of Cylinders .......... 3
Engine Bore, in (mm) .......... 2.76 (70.0)
Engine Stroke, in (mm) .......... 2.91 (74.0)
Displacement, cu.in (L) .......... 52.12 (0.854)
Maximum Engine Power, hp (kW) .......... 18.4 (13.7)
Maximum Engine Speed, rpm .......... 3000
High Idle Speed, rpm ......... 3210±25
Firing Order .......... 1-3-2
Direction of Rotation .......... Counterclockwise (Viewed From Flywheel Side)
Intake/Exhaust Valve Gap, in (mm) .......... 0.006-0.010 (0.15-0.25)
Air Cleaner .......... Replaceable, Paper Elements

Fuel System

Fuel Injection Pump .......... In-line type
Fuel Filter .......... Replaceable Element
Fuel Injection Pressure, psi (MPa) .......... 1711-1842 (11.8-12.8)
Combustion System .......... Ball Type Swirl Chamber
Injection Timing (BTDC), deg .......... 18
Fuel injector opening pressure, psi (MPa) .......... 72.5 (0.5)

Lubrication System

Lubricating System .......... Forced Lubrication With Trochoid Pump
Oil Filter .......... Spin On Filter
Normal Oil Pressure at Rated Speed, psi (MPa) .......... 42-64 (0.29-0.44)
Normal Oil Pressure at Low Idle Speed, psi (MPa) .......... 8.5 (0.06)
Engine Oil Pan Capacity, qt (L) .......... 3.0 (2.8)

Cooling System

Cooling System .......... Liquid-Cooled With Radiator
Cooling System Capacity, qt (L) .......... 4.1 (3.8)
Standard Cooling Fan .......... 5 Blades Pusher Type
Thermostat Opening Temperature .......... 157-163F (70-73C)
Full Opening Lift Temperature .......... 185F (85C)

Electrical System

Electrical System Rating, Volts .......... 12
Charging System .......... Alternator
Alternator Rating, Amps .......... DC12V, 18A
Starting System .......... Electric Starting
Starter Motor .......... DC12V, 1.3 hp (1.0 kW)
Battery Capacity .......... 12V, 52 Amp-Hour

Dimensions

Width, in (mm) .......... 16.81 (427)
Height, in (mm) .......... 19.92 (506)
Depth, in (mm) .......... 19.84 (504)
Weight, lbs (kg) .......... 185 (84)

Yanmar 3TNV70 Maintenance Data

Engine oil type .......... SAE 10W-40/5W-30
Engine oil capacity, qt (L) .......... 3.0 (2.8)
Coolant capacity, qt (L) .......... 4.1 (3.8)
Oil filter change interval .......... Every 250 hours
Oil change interval .......... Every 250 hours
Fuel filter change interval .......... Every 500 hours

Yanmar 3TNV70 Service Specifications

Cylinder Block

Cylinder Inside Diameter (Std) ........ 2.7563-2.7567 in (70.010-70.020 mm)
Cylinder Inside Diameter (Wear Limit) ........ 2.7638 in (70.200 mm)
Cylinder Bore Ovality (Std) ........ 0.0004 in (0.01 mm)
Cylinder Bore Ovality (Wear Limit) ........ 0.0012 in (0.03 mm)
Tappet Bore (Cylinder Block) Inside Diameter (Std) ........ 0.8268-0.8276 in (21.000-21.021 mm)
Tappet Bore (Cylinder Block) Inside Diameter (Wear Limit) ........ 0.8284 in (21.041 mm)
Tappet Stem Outside Diameter (Std) ........ 0.8239-0.8252 in (20.927-20.960 mm)
Tappet Stem Outside Diameter (Wear Limit) ........ 0.8231 in (20.907 mm)
Tappet Clearance (Std) ........ 0.0016-0.0037 in (0.040-0.094 mm)
Tappet Clearance (Wear Limit) ........ 0.0053 in (0.134 mm)

Cylinder Head

Cylinder Head Surface Flatness (Std) ........ 0.0020 in (0.05 mm)
Cylinder Head Surface Flatness (Wear Limit) ........ 0.0059 in (0.15 mm)
Valve Clearance (Intake and Exhaust) ........ 0.006-0.010 in (0.15-0.25 mm)
Valve Recession (Std) ........ 0.0157-0.0236 in (0.4-0.6 mm)
Valve Recession (Wear Limit) ........ 0.0354 in (0.9 mm)
Intake Valve Seat Angle ........ 120 deg
Exhaust Valve Seat Angle ........ 90 deg
Valve Seat Angle Correction ........ 40, 150 deg
Intake Guide Inside Diameter (Std) ........ 0.2362-0.2367 in (6.000-6.012 mm)
Intake Guide Inside Diameter (Wear Limit) ........ 0.2394 in (6.08 mm)
Intake Valve Stem Outside Diameter (Std) ........ 0.2346-0.2352 in (5.960-5.975 mm)
Intake Valve Stem Outside Diameter (Wear Limit) ........ 0.2323 in (5.90 mm)
Intake Valve Clearance (Std) ........ 0.0010-0.0020 in (0.025-0.052 mm)
Intake Valve Clearance (Wear Limit) ........ 0.0063 in (0.15 mm)
Intake Valve Stem Bend ........ 0.0004 in (0.010 mm)
Exhaust Guide Inside Diameter (Std) ........ 0.2362-0.2367 in (6.000-6.012 mm)
Exhaust Guide Inside Diameter (Wear Limit) ........ 0.2394 in (6.08 mm)
Exhaust Valve Stem Outside Diameter (Std) ........ 0.2341-0.2346 in (5.945-5.960 mm)
Exhaust Valve Stem Outside Diameter (Wear Limit) ........ 0.2323 in (5.90 mm)
Exhaust Valve Clearance (Std) ........ 0.0016-0.0026 in (0.040-0.067 mm)
Exhaust Valve Clearance (Wear Limit) ........ 0.0067 in (0.17 mm)
Exhaust Valve Stem Bend ........ 0.0004 in (0.010 mm)
Push Rod Bend ........ 0.0012 in (0.03 mm)
Valve Spring Free Length ........ 1.4882 in (37.8 mm)
Rocker Arm Shaft Hole Diameter ........ 0.4724-0.4732 in (12.000-12.020 mm)
Rocker Arm Shaft Outside Diameter ........ 0.4711-0.4718 in (11.966-11.984 mm)
Rocker Arm Shaft Clearance ........ 0.0006-0.0021 in (0.016-0.054 mm)

Camshaft

Camshaft End Play ........ 0.0020-0.0059 in (0.05-0.15 mm)
Camshaft Bend ........ 0-0.0008 in (0-0.02 mm)
Cam Lobe Height ........ 1.3439-1.3490 in (34.135-34.265 mm)
Bushing Inside Diameter (Gear End) ........ 1.5748-1.5778 in (40.000-40.075 mm)
Camshaft Outside Diameter (Gear End) ........ 1.5724-1.5732 in (39.940-39.960 mm)
Camshaft Oil Clearance (Gear End) ........ 0.0016-0.0053 in (0.040-0.135 mm)
Bushing Inside Diameter (Intermediate) ........ 1.5748-1.5758 in (40.000-40.025 mm)
Camshaft Outside Diameter (Intermediate) ........ 1.5713-1.5722 in (39.910-39.935 mm)
Camshaft Oil Clearance (Intermediate) ........ 0.0026-0.0045 in (0.065-0.115 mm)
Bushing Inside Diameter (Flywheel End) ........ 1.5748-1.5758 in (40.000-40.025 mm)
Camshaft Outside Diameter (Flywheel End) ........ 1.5724-1.5732 in (39.940-39.960 mm)
Camshaft Oil Clearance (Flywheel End) ........ 0.0016-0.0033 in (0.040-0.085 mm)

Crankshaft

Crankshaft Bend ........ 0.0008 in (0.02 mm)
Connecting Rod Journal Outside Diameter ........ 1.6517-1.6520 in (41.952-41.962 mm)
Connecting Rod Journal Bearing Inside Diameter ........ 1.6528-1.6536 in (41.982-42.002 mm)
Connecting Rod Journal Bearing Insert Thickness ........ 0.0592-0.0594 in (1.503-1.509 mm)
Connecting Rod Journal Clearance ........ 0.0008-0.0020 in (0.020-0.050 mm)
Main Bearing Journal Outside Diameter ........ 1.8485-1.8489 in (46.952-46.962 mm)
Main Bearing Journal Inside Diameter ........ 1.8497-1.8505 in (46.982-47.002 mm)
Main Bearing Journal Insert Thickness ........ 0.0791-0.0793 in (2.009-2.014 mm)
Main Bearing Journal Clearance ........ 0.0008-0.0020 in (0.020-0.050 mm)
Connecting Rod Journal Undersize Finished Size ........ 1.6418-1.6422 in (41.702-41.712 mm)
Main Bearing Journal Undersize Finished Size ........ 1.8387-1.8391 in (46.702-46.712 mm)
Journal Radius ........ 0.138-0.150 in (3.5-3.8 mm)
Crankshaft End Play ........ 0.0044-0.0098 in (0.111-0.250 mm)
Crankshaft Bearing Thickness ........ 0.0760-0.0780 in (1.930-1.980 mm)

Pistons

Piston Outside Diameter ........ 2.7543-2.7555 in (69.960-69.990 mm)
Piston Inside Diameter ........ 0.8661-0.9843 in (22.0-25.0 mm)
Piston to Cylinder Clearance ........ 0.0012-0.0020 in (0.030-0.050 mm)
Piston Pin Hole Inside Diameter ........ 0.8661-0.8665 in (22.000-22.009 mm)
Piston Pin Outside Diameter ........ 0.8659-0.8661 in (21.995-22.000 mm)
Piston Pin Clearance ........ 0.0-0.0006 in (0.0-0.014 mm)

Piston Rings

Top Ring Groove Width ........ 0.0610-0.0618 in (1.550-1.570 mm)
Top Ring Width (Std/Wear Limit) ........ 0.0579-0.0587 in (1.470-1.490 mm) / 0.0571 in (1.450 mm)
Top Ring Side Clearance ........ 0.0024-0.0039 in (0.060-0.100 mm)
Top Ring End Clearance (Std/Wear Limit) ........ 0.0059-0.0118 in (0.150-0.300 mm) / 0.0154 in (0.390 mm)
Second Ring Groove Width (Std/Wear Limit) ........ 0.0606-0.0614 in (1.540-1.560 mm) / 0.0654 in (1.660 mm)
Second Ring Width (Std/Wear Limit) ........ 0.0579-0.0587 in (1.470-1.490 mm) / 0.0571 in (1.950 mm)
Second Ring Side Clearance (Std/Wear Limit) ........ 0.0020-0.0035 in (0.050-0.090 mm) / 0.0083 in (0.210 mm)
Second Ring End Clearance (Std/Wear Limit) ........ 0.0071-0.0130 in (0.180-0.33 mm) / 0.0165 in (0.42 mm)
Oil Ring Groove Width (Std/Wear Limit) ........ 0.1185-0.1193 in (3.010-3.030 mm) / 0.1232 in (3.130 mm)
Oil Ring Width (Std/Wear Limit) ........ 0.1170-0.1177 in (2.970-2.990 mm) / 0.1161 in (2.950 mm)
Oil Ring Side Clearance (Std/Wear Limit) ........ 0.0008-0.0024 in (0.020-0.060 mm) / 0.0071 in (0.180 mm)
Oil Ring End Clearance (Std/Wear Limit) ........ 0.0059-0.0138 in (0.150-0.350 mm) / 0.0173 in (0.440 mm)

Connecting Rod

Connecting Rod Small End Bushing Inside Diameter ........ 0.8671-0.8676 in (22.025-22.038 mm)
Connecting Rod Small End Outside Diameter ........ 0.8658-0.8661 in (21.991-22.000 mm)
Connecting Rod Small End Oil Clearance ........ 0.0010-0.0019 in (0.025-0.047 mm)
Connecting Rod Big End Side Clearance ........ 0.0079-0.0157 in (0.20-0.40 mm)

Yanmar 3TNV70 Tightening Torque Specs

Cylinder Head Bolts, M9x1.25 ........ 40-43 ft-lbs (53.9-57.9 Nm)
Connecting Rod Bolts, M7x1.0 ........ 17-20 ft-lbs (22.6-27.5 Nm)
Flywheel Bolts, M10x1.25 ........ 59-64 ft-lbs (80.4-86.4 Nm)
Main Bearing Cap Bolts, M10x1.25 ........ 56-60 ft-lbs (75.5-81.5 Nm)
Crankshaft Pulley Bolts, M12x1.25 ........ 61-69 ft-lbs (83.3-93.3 Nm)
Glow Plug, M10x1.25 ........ 11-15 ft-lbs (14.7-19.6 Nm)
Fuel Injector ........ 29 ft-lbs (39.2 Nm)
Fuel Pump Drive Gear Nut ........ 44-51 ft-lbs (59-69 Nm)
High Pressure Injection Line Nuts ........ 22-25 ft-lbs (29-34 Nm)
Fuel Injection Pump Mounting Nuts ........ 17-21 ft-lbs (23-28 Nm)
Fuel Injector Nozzle Case Nut ........ 36-39 ft-lbs (49-53 Nm)