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Yanmar 2TNV70 Engine

General Technical Data

Yanmar 2TNV70 Engine Specs

Engine Model ................ Yanmar 2TNV70
Engine Type ................ Vertical inline water cooled diesel
Number of Cylinders ................ 2
Total Displacement, cu.in (L) ................ 34.78 (0.570)
Cylinder Bore, in (mm) ................ 2.76 (70.0)
Piston Stroke, in (mm) ................ 2.91 (74.0)
Rated Engine Power, hp (kW) ................ 12.2 (9.1)
Rated Engine Speed, rpm ................ 3000
High Idle Speed, rpm ................ 3210±25
Aspiration Type ................ Naturally aspirated
Firing Order ................ 1-2
Direction of Rotation ................ Counterclockwise (Flywheel Side)
Combustion System ................ Ball type swirl chamber
Air Cleaner Type ................ Replaceable, paper elements
Lubricating System ................ Forced with trochoid pump
Oil Filter Type ................ Spin On
Cooling System ................ Liquid-cooled with radiator
Electrical System Rating, Volts ................ 12
Charging System ................ Alternator
Alternator Rating, Amps ................ 18

Fuel System

Fuel System ................ Indirect injection
Fuel Injection Pump ................ Mechanical, in-line type
Fuel Filter Type ................ Replaceable element
Fuel Injection Pressure, psi (kPa) ................ 1711-1842 (11800-12800)
Fuel Injection Timing, deg ................ 18, BTDC
Fuel injector Opening Pressure, psi (kPa) ................ 72.5 (500)

Dimensions and Weight

Overall Width, in (mm) ................ 16.8 (427)
Overall Height, in (mm) ................ 19.1 (485)
Overall Length, in (mm) ................ 16.4 (419)
Net Weight, lbs (kg) ................ 146 (66)

Yanmar 2TNV70 Maintenance

Service Data

Cylinder bore inside diameter, in (mm) ................ 2.7563-2.7567 (70.010-70.020)
Cylinder head (max out of flatness), in (mm) ................ 0.05 (0.002)
Intake valve clearance (Cold), in (mm) ................ 0.006-0.010 (0.15-0.25)
Exhaust valve clearance (Cold), in (mm) ................ 0.006-0.010 (0.15-0.25)
Cylinder compression, psi (kPa) ................ 370-470 (2550-3245)
Engine oil pressure (rated speed), psi (kPa) ................ 42-64 (289-440)
Engine oil pressure (low idle speed), psi (kPa) ................ 8.8 (60)
Fuel injection pressure, psi (kPa) ................ 1711-1842 (11800-12800)
Fuel injection timing, deg ................ 18, BTDC
Fuel injector opening pressure, psi (kPa) ................ 72.5 (500)
Fan belt tension, N (lbf) ................ 98 (22)
Fan belt deflection, in (mm) ................ 0.35-0.55 (9.0-14.0)

Engine Oil and Filters

Engine oil type ................ SAE 10W-30, 15W-40
API service classification ................ CD or higher
Engine oil capacity, qts (L) ................ 1.7 (1.65)
Oil filter part number ................ 119305-35150
Air filter part number ................ 119515-12520
Fuel filter part number ................ 119810-55650

Yanmar 2TNV70 Service Specifications

Cylinder Block

Cylinder Bore I.D (Std), in (mm) ................ 2.7563-2.7567 (70.010-70.020)
Cylinder Bore I.D (Wear Limit), in (mm) ................ 2.7638 (70.200)
Crankshaft Main Bearing Journal O.D, in (mm) ................ 1.8485-1.8489 (46.952-46.962)
Crankshaft Main Bearing Journal I.D, in (mm) ................ 1.8497-1.8505 (46.982-47.002)
Crankshaft Main Bearing Journal Clearance, in (mm) ................ 0.0008-0.0020 (0.020-0.050)
Crankshaft End Play, in (mm) ................ 0.0044-0.0098 (0.111-0.250)
Connecting Rod Journal O.D, in (mm) ................ 1.6517-1.6520 (41.952-41.962)
Connecting Rod Journal Bearing I.D, in (mm) ................ 1.6528-1.6536 (41.982-42.002)
Connecting Rod Journal Clearance, in (mm) ................ 0.0008-0.0020 (0.020-0.050)
Connecting Rod Small End Bushing I.D, in (mm) ................ 0.8671-0.8676 (22.025-22.038)
Connecting Rod Small End O.D, in (mm) ................ 0.8658-0.8661 (21.991-22.000)
Connecting Rod Small End Oil Clearance, in (mm) ................ 0.0010-0.0019 (0.025-0.047)
Connecting Rod Big End Side Clearance, in (mm) ................ 0.0079-0.0157 (0.20-0.40)

Cylinder Head

Cylinder Head Surface Flatness (Std), in (mm) ................ 0.0020 (0.05)
Cylinder Head Surface Flatness (Wear Limit), in (mm) ................ 0.0059 (0.15)
Valve Clearance (Intake and Exhaust), in (mm) ................ 0.006-0.010 (0.15-0.25)
Valve Recession (Std), in (mm) ................ 0.0157-0.0236 (0.4-0.6)
Valve Recession (Wear Limit), in (mm) ................ 0.0354 (0.9)
Intake Valve Seat Angle, deg ................ 120
Exhaust Valve Seat Angle, deg ................ 90
Intake Guide I.D (Std), in (mm) ................ 0.2362-0.2367 (6.000-6.012)
Intake Guide I.D (Wear Limit), in (mm) ................ 0.2394 (6.08)
Intake Valve Stem O.D (Std), in (mm) ................ 0.2346-0.2352 (5.960-5.975)
Intake Valve Stem O.D (Wear Limit), in (mm) ................ 0.2323 (5.90)
Intake Valve Clearance (Std), in (mm) ................ 0.0010-0.0020 (0.025-0.052)
Intake Valve Clearance (Wear Limit), in (mm) ................ 0.0063 (0.15)
Intake Valve Stem Bend, in (mm) ................ 0.0004 (0.010)
Exhaust Guide I.D (Std), in (mm) ................ 0.2362-0.2367 (6.000-6.012)
Exhaust Guide I.D (Wear Limit), in (mm) ................ 0.2394 (6.08)
Exhaust Valve Stem O.D (Std), in (mm) ................ 0.2341-0.2346 (5.945-5.960)
Exhaust Valve Stem O.D (Wear Limit), in (mm) ................ 0.2323 (5.90)
Exhaust Valve Clearance (Std), in (mm) ................ 0.0016-0.0026 (0.040-0.067)
Exhaust Valve Clearance (Wear Limit), in (mm) ................ 0.0067 (0.17)
Valve Spring Free Length, in (mm) ................ 1.4882 (37.8)
Rocker Arm Shaft Bore I.D, in (mm) ................ 0.4724-0.4732 (12.000-12.020)
Rocker Arm Shaft O.D, in (mm) ................ 0.4711-0.4718 (11.966-11.984)
Rocker Arm Shaft Clearance, in (mm) ................ 0.0006-0.0021 (0.016-0.054)
Camshaft End Play, in (mm) ................ 0.0020-0.0059 (0.05-0.15)
Cam Lobe Height, in (mm) ................ 1.3439-1.3490 (34.135-34.265)
Camshaft Bushing I.D (Gear End), in (mm) ................ 1.5748-1.5778 (40.000-40.075)
Camshaft O.D (Gear End), in (mm) ................ 1.5724-1.5732 (39.940-39.960)
Camshaft Oil Clearance (Gear End), in (mm) ................ 0.0016-0.0053 (0.040-0.135)
Camshaft Bushing I.D (Intermediate), in (mm) ................ 1.5748-1.5758 (40.000-40.025)
Camshaft O.D (Intermediate), in (mm) ................ 1.5713-1.5722 (39.910-39.935)
Camshaft Oil Clearance (Intermediate), in (mm) ................ 0.0026-0.0045 (0.065-0.115)
Camshaft Bushing I.D (Flywheel End), in (mm) ................ 1.5748-1.5758 (40.000-40.025)
Camshaft O.D (Flywheel End), in (mm) ................ 1.5724-1.5732 (39.940-39.960)
Camshaft Oil Clearance (Flywheel End), in (mm) ................ 0.0016-0.0033 (0.040-0.085)

Pistons and Piston Rings

Piston O.D, in (mm) ................ 2.7543-2.7555 (69.960-69.990)
Piston to Cylinder Clearance, in (mm) ................ 0.0012-0.0020 (0.030-0.050)
Piston Pin Bore I.D, in (mm) ................ 0.8661-0.8665 (22.000-22.009)
Piston Pin O.D, in (mm) ................ 0.8659-0.8661 (21.995-22.000)
Piston Pin Clearance, in (mm) ................ 0.0-0.0006 (0.0-0.014)
Top Ring Groove Width, in (mm) ................ 0.0610-0.0618 (1.550-1.570)
Top Ring Width, in (mm) ................ 0.0579-0.0587 (1.470-1.490)
Top Ring Groove Clearance, in (mm) ................ 0.0024-0.0039 (0.060-0.100)
Second Ring Groove Width, in (mm) ................ 0.0606-0.0614 (1.540-1.560)
Second Ring Width, in (mm) ................ 0.0579-0.0587 (1.470-1.490)
Second Ring Groove Clearance, in (mm) ................ 0.0020-0.0035 (0.050-0.090)
Oil Ring Groove Width, in (mm) ................ 0.1185-0.1193 (3.010-3.030)
Oil Ring Width, in (mm) ................ 0.1170-0.1177 (2.970-2.990)
Oil Ring Groove Clearance, in (mm) ................ 0.0008-0.0024 (0.020-0.060)

Tightening Torques

Cylinder Head Bolts, (M9x1.25) ................ 40-43 ft-lb (53.9-57.9 Nm)
Connecting Rod Bolts, (M7x1.0) ................ 17-20 ft-lb (22.6-27.5 Nm)
Flywheel Bolts, (M10x1.25) ................ 59-64 ft-lb (80.4-86.4 Nm)
Main Bearing Cap Bolts, (M10x1.25) ................ 56-60 ft-lb (75.5-81.5 Nm)
Crankshaft Pulley Bolts, (M12x1.25) ................ 61-69 ft-lb (83.3-93.3 Nm)
Glow Plug, (M10x1.25) ................ 11-15 ft-lb (14.7-19.6 Nm)
Oil Drain Plug, ft-lb (Nm) ................ 14-17 ft-lb (19.6-23.5 Nm)
Fuel Injector ................ 29 ft-lbs (39.2 Nm)
Fuel Pump Drive Gear Nut ................ 44-51 ft-lb (59-69 Nm)
High Pressure Injection Line Nuts ................ 22-25 ft-lb (29-34 Nm)
Fuel Injection Pump Mounting Nuts ................ 17-21 ft-lb (23-28 Nm)
Fuel Injector Nozzle Case Nut ................ 36-39 ft-lb (49-53 Nm)