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Yanmar 3T72SA Engine

General Technical Data

Engine Specifications

Engine Model ............... Yanmar 3T72SA
Engine Type ............... 4-cycle vertical inline 3-cylinder water-cooled diesel
Number of Cylinders ............... 3
Cylinder Arrangement ............... In-line
Engine Bore, in (mm) ............... 2.834 (72.0)
Engine Stroke, in (mm) ............... 2.834 (72.0)
Displacement, cu.in (L) ............... 53.64 (0.879)
Rated Engine Power, hp (kW) ............... 15.0-18.5 (11.2-13.8)
Rated Engine Speed, rpm ............... 2800-3000
Maximum No-Load Speed, rpm ............... 3150-3200
Minimum Idling Speed, rpm ............... 700-800
Compression Ratio ............... 22.5:1-23.0:1
Firing Order ............... 1-3-2
Combustion Chamber ............... Swirl pre-combustion chamber type
Direction of Rotation ............... Counter-clockwise viewed from the flywheel side
Cylinder Block Material ............... High-strength cast iron
Cylinder Head Material ............... Monoblock cast iron
Aspiration Type ............... Naturally aspirated
Cooling System ............... Forced water circulation by centrifugal pump
Lubrication System ............... Forced lubrication by trochoid pump type
Power Take-Off Location ............... Flywheel end side design structure
Starting System ............... Electric starter motor excitation
Electrical System ............... 12V
Charging Alternator ............... 15A

Fuel System

Fuel Injection Pump Type ............... Yanmar YPES-series inline block design mini type
Fuel Injection Pump Plunder Diameter, in (mm) ............... 0.196-0.216 (5.0-5.5)
Fuel Injection Pump Stroke, in (mm) ............... 0.236 (6.0)
Fuel Injection Timing, deg BTDC ............... 14.0-16.0
Fuel Injection Nozzle Holder Type ............... Yanmar single-hole throttle type arrangement
Fuel Injection Nozzle Valve Type ............... Pintle throttle nozzle configuration design
Fuel Injection Pressure, psi (MPa) ............... 1706.8-1849.0 (11.77-12.75)
Governor Type ............... Mechanical centrifugal all-speed type
Fuel Feed Pump Type ............... Mechanical diaphragm type driven by camshaft lobe
Fuel Feed Pump Delivery Pressure, psi (bar) ............... 2.9-4.3 (0.2-0.3)
Fuel Feed Pump Maximum Suction Head, ft (m) ............... 3.28 (1.0)
Fuel Filter Type ............... Spin-on full cartridge paper element setup with bowl
Water Separator Type ............... Transparent sedimenter bowl with float level indicator
Fuel Return Line Configuration ............... Overhead overflow pipe collection setup line
Fuel Tank Capacity Range, gal (L) ............... 4.22-5.81 (16.0-22.0)
Fuel Minimum Cetane Rating ............... 45-50 high grade automotive light oil standard
Fuel Specification Type ............... ASTM D975 Grade number 2-D or BS 2869 Class A1
Fuel Specific Consumption Rate, g/hp-h (g/kW-h) ............... 198.4-213.2 (266.0-286.0)
Maximum Fuel System Restriction, in Hg (mmAq) ............... 3.93 (100.0)
Injection Pipe Outer Diameter, in (mm) ............... 0.236 (6.0)
Injection Pipe Inner Diameter, in (mm) ............... 0.078 (2.0)
Injection Pipe Length, in (mm) ............... 15.74 (400.0)
Governor Regulation Factor Percentage ............... 8.0-12.0
Fuel Cut-off System Mechanism ............... Mechanical manual lever or optional 12V solenoid coil
Fuel Solenoid Current Draw, A ............... 1.2 continuous holding amperage configuration
Fuel Air Bleeding System ............... Manual priming lever activation on pump head housing

Dimensions and Weight

Overall Length, in (mm) ............... 20.3-21.6 (515-550)
Overall Width, in (mm) ............... 16.5-17.7 (420-450)
Overall Height, in (mm) ............... 22.0-23.6 (560-600)
Dry Weight, lbs (kg) ............... 243 (110)
Wet Weight, lbs (kg) ............... 265 (120)

Maintenance Data

Service Information

Compression Pressure, psi (MPa) ............... 426.7-455.1 (2.94-3.13)
Minimum Compression Limit, psi (MPa) ............... 355.5 (2.45)
Oil Pressure at Rated Speed, psi (MPa) ............... 42.6-56.8 (0.29-0.39)
Oil Pressure at Idle Speed, psi (MPa) ............... 8.5 (0.058)
Lubricating Oil Temperature, Normal, F (C) ............... 167-194 (75-90)
Lubricating Oil Max Limit Temperature, F (C) ............... 230 (110)
Thermostat Valve Opening Start Temp, F (C) ............... 156.2-161.6 (69.0-72.0)
Thermostat Valve Full Open Temp, F (C) ............... 185 (85)
Cooling System Operating Cap Pressure, psi (bar) ............... 12.78 (0.88)
Coolant Temperature Normal Operational, F (C) ............... 176-194 (80-90)
Intake Valve Clearance, Cold, in (mm) ............... 0.0078 (0.20)
Exhaust Valve Clearance, Cold, in (mm) ............... 0.0078 (0.20)

Engine Oil and Coolant

Engine Oil Type .................. SAE 10W-30, SAE 15W-40
API Service Classifications ......................... CD, CE, CF
Engine Oil Capacity (Upper Level), qt (L) ............... 3.17 (3.0)
Engine Oil Capacity (Lower Level), qt (L) ............... 1.58 (1.5)
Engine Total System Oil Capacity, qt (L) ............... 3.48 (3.3)
Cooling Liquid System Capacity, qt (L) ............... 4.22 (4.0)
Cooling Capacity With Radiator, qt (L) ............... 6.34-7.39 (6.0-7.0)

Service Intervals

Change engine oil ............... Every 200 hours
Replace oil filter ............... Every 200 hours
Replace fuel filter ............... Every 400 hours
Service air filter ............... Every 100 hours
Replace air filter ............... Every 1000 hours
Change coolant ............... Every 2000 hours
Valve-lash adjustment ............... Every 400 hours
Check fuel system ............... Every 1000 hours
Compression test ............... Every 1000 hours
Belt inspection ............... Every 100 hours

Service Specifications

Cylinder Bore Inside Diameter, in (mm) ............... 2.8346-2.8350 (72.000-72.010)
Cylinder Bore Maximum Out-of-Round, in (mm) ............... 0.0008 (0.02)
Cylinder Bore Maximum Taper, in (mm) ............... 0.0011 (0.03)
Connecting Rod Small End Bushing I.D, in (mm) ............... 0.8665-0.8673 (22.010-22.030)
Crankshaft Main Journal Outside Diameter, in (mm) ............... 1.9665-1.9671 (49.950-49.965)
Main Bearing Shell Inside Diameter, in (mm) ............... 1.9685-1.9696 (50.000-50.030)
Main Bearing Oil Clearance, in (mm) ............... 0.0013-0.0031 (0.035-0.080)
Crankpin Journal Outside Diameter, in (mm) ............... 1.5728-1.5734 (39.950-39.965)
Connecting Rod Big End Bearing I.D, in (mm) ............... 1.5748-1.5760 (40.000-40.030)
Connecting Rod Bearing Clearance, in (mm) ............... 0.0013-0.0031 (0.035-0.080)
Crankshaft Side Thrust Play, in (mm) ............... 0.0043-0.0090 (0.110-0.230)
Connecting Rod Big End Side Clearance, in (mm) ............... 0.0059-0.0118 (0.150-0.300)
Piston Skirt Outside Diameter, in (mm) ............... 2.8322-2.8334 (71.940-71.970)
Piston to Cylinder Wall Clearance, in (mm) ............... 0.0019-0.0027 (0.050-0.070)
Piston Pin Bore Inside Diameter, in (mm) ............... 0.8661-0.8665 (22.000-22.010)
Piston Pin Outside Diameter, in (mm) ............... 0.8657-0.8661 (21.990-22.000)
Piston Pin to Piston Pin Bore Clearance, in (mm) ............... 0.0000-0.0007 (0.000-0.020)
Piston Pin to Small End Bushing Clearance, in (mm) ............... 0.0003-0.0015 (0.010-0.040)
Top Ring Groove Width, in (mm) ............... 0.0799-0.0807 (2.030-2.050)
Second Ring Groove Width, in (mm) ............... 0.0791-0.0799 (2.010-2.030)
Oil Ring Groove Width, in (mm) ............... 0.1578-0.1586 (4.010-4.030)
Top Ring Side Clearance, in (mm) ............... 0.0027-0.0041 (0.070-0.105)
Second Ring Side Clearance, in (mm) ............... 0.0019-0.0033 (0.050-0.085)
Oil Ring Side Clearance, in (mm) ............... 0.0011-0.0027 (0.030-0.070)
Top Ring End Gap, in (mm) ............... 0.0078-0.0137 (0.200-0.350)
Second Ring End Gap, in (mm) ............... 0.0078-0.0137 (0.200-0.350)
Oil Ring End Gap, in (mm) ............... 0.0078-0.0157 (0.200-0.400)
Cylinder Head Surface Distortion Flatness, in (mm) ............... 0.0019 (0.05)
Intake Valve Guide Inside Diameter, in (mm) ............... 0.2755-0.2761 (7.000-7.015)
Exhaust Valve Guide Inside Diameter, in (mm) ............... 0.2755-0.2761 (7.000-7.015)
Intake Valve Stem Outside Diameter, in (mm) ............... 0.2736-0.2742 (6.950-6.965)
Exhaust Valve Stem Outside Diameter, in (mm) ............... 0.2724-0.2732 (6.920-6.940)
Intake Valve Stem to Guide Clearance, in (mm) ............... 0.0013-0.0025 (0.035-0.065)
Exhaust Valve Stem to Guide Clearance, in (mm) ............... 0.0023-0.0037 (0.060-0.095)
Intake Valve Head Thickness, in (mm) ............... 0.0393 (1.00)
Exhaust Valve Head Thickness, in (mm) ............... 0.0393 (1.00)
Intake Valve Seat Width, in (mm) ............... 0.0433-0.0551 (1.100-1.400)
Exhaust Valve Seat Width, in (mm) ............... 0.0511-0.0629 (1.300-1.600)
Intake Valve Sinking Depth, in (mm) ............... 0.0157-0.0275 (0.400-0.700)
Exhaust Valve Sinking Depth, in (mm) ............... 0.0157-0.0275 (0.400-0.700)
Intake Valve Seat Angle, deg ............... 45.0
Exhaust Valve Seat Angle, deg ............... 45.0
Valve Spring Standard Length, in (mm) ............... 1.4960 (38.00)
Camshaft Main Journal Outside Diameter, in (mm) ............... 1.5724-1.5732 (39.940-39.960)
Camshaft Journal Bearing Bore Inside Diameter, in (mm) ............... 1.5748-1.5767 (40.000-40.050)
Camshaft Main Journal Clearance, in (mm) ............... 0.0015-0.0043 (0.040-0.110)
Intake Cam Lobe Height, in (mm) ............... 1.2952-1.2992 (32.900-33.000)
Exhaust Cam Lobe Height, in (mm) ............... 1.2952-1.2992 (32.900-33.000)
Camshaft Thrust End Play, in (mm) ............... 0.0019-0.0059 (0.050-0.150)
Rocker Arm Shaft Outside Diameter, in (mm) ............... 0.4716-0.4722 (11.980-11.995)
Rocker Arm Bushing Inside Diameter, in (mm) ............... 0.4724-0.4731 (12.000-12.018)
Rocker Arm Shaft to Bushing Clearance, in (mm) ............... 0.0001-0.0014 (0.005-0.038)
Tappet Outside Diameter, in (mm) ............... 0.8244-0.8251 (20.940-20.960)
Tappet Guide Hole Inside Diameter, in (mm) ............... 0.8267-0.8275 (21.000-21.021)
Tappet to Guide Clearance, in (mm) ............... 0.0015-0.0031 (0.040-0.081)

Tightening Torques

Cylinder Head Bolt, lb-ft (Nm) ............... 50.6-54.2 (68.6-73.5)
Connecting Rod Cap Bolt, lb-ft (Nm) ............... 23.1-25.3 (31.4-34.3)
Main Bearing Cap Bolt, lb-ft (Nm) ............... 39.7-43.3 (53.9-58.8)
Flywheel Retaining Bolt, lb-ft (Nm) ............... 57.8-61.4 (78.4-83.3)
Crankshaft V-Pulley End Nut, lb-ft (Nm) ............... 83.1-90.4 (112.7-122.5)
Camshaft Thrust Plate Bolt, lb-ft (Nm) ............... 6.5-8.6 (8.8-11.7)
Rocker Arm Shaft Support Bolt, lb-ft (Nm) ............... 17.3-20.2 (23.5-27.4)
Valve Adjusting Locknut, lb-ft (Nm) ............... 6.5-8.6 (8.8-11.7)
Cylinder Head Cover Bonnet Bolt, lb-ft (Nm) ............... 5.0-6.5 (6.8-8.8)
Oil Pan Drain Plug, lb-ft (Nm) ............... 36.1-43.3 (49.0-58.8)
Oil Pan Mounting Bolt, lb-ft (Nm) ............... 6.5-8.6 (8.8-11.7)
Fuel Injection Nozzle Holder Nut, lb-ft (Nm) ............... 43.3-50.6 (58.8-68.6)
Fuel Injection High Pressure Pipe Nut, lb-ft (Nm) ............... 17.3-21.6 (23.5-29.4)
Fuel Pump Delivery Valve Holder, lb-ft (Nm) ............... 25.3-28.9 (34.3-39.2)
Fuel Pump Mounting Stud Nut, lb-ft (Nm) ............... 14.4-17.3 (19.6-23.5)
Exhaust Manifold Mounting Nut, lb-ft (Nm) ............... 17.3-21.6 (23.5-29.4)
Intake Manifold Mounting Bolt, lb-ft (Nm) ............... 14.4-17.3 (19.6-23.5)
Water Pump Mounting Bolt, lb-ft (Nm) ............... 14.4-17.3 (19.6-23.5)
Thermostat Housing Bolt, lb-ft (Nm) ............... 14.4-17.3 (19.6-23.5)
Starter Motor Mounting Bolt, lb-ft (Nm) ............... 28.9-36.1 (39.2-49.0)
Alternator Mounting Pivot Bolt, lb-ft (Nm) ............... 28.9-36.1 (39.2-49.0)
Alternator Adjusting Link Lockbolt, lb-ft (Nm) ............... 11.5-14.4 (15.7-19.6)
Oil Pressure Switch Sensor Body, lb-ft (Nm) ............... 10.8-14.4 (14.7-19.6)
Glow Plug Body Installation, lb-ft (Nm) ............... 10.8-14.4 (14.7-19.6)
Glow Plug Terminal Wire Nut, lb-ft (Nm) ............... 1.4-2.1 (2.0-2.9)
Gear Housing Case Cover M6 Bolt, lb-ft (Nm) ............... 6.5-8.6 (8.8-11.7)
Gear Housing Case Cover M8 Bolt, lb-ft (Nm) ............... 14.4-17.3 (19.6-23.5)
Flywheel Housing Backing Plate M8 Bolt, lb-ft (Nm) ............... 17.3-21.6 (23.5-29.4)
Flywheel Housing Backing Plate M10 Bolt, lb-ft (Nm) ............... 36.1-43.3 (49.0-58.8)
Lubricating Oil Pipe Union Eye M8 Bolt, lb-ft (Nm) ............... 8.6-11.5 (11.7-15.7)
Lubricating Oil Pipe Union Eye M10 Bolt, lb-ft (Nm) ............... 14.4-17.3 (19.6-23.5)
Lubricating Oil Pipe Union Eye M12 Bolt, lb-ft (Nm) ............... 21.6-25.3 (29.4-34.3)
Fuel Filter Bracket Mounting Bolt, lb-ft (Nm) ............... 14.4-17.3 (19.6-23.5)
Cooling Fan Pulley Nut, lb-ft (Nm) ............... 36.1-43.3 (49.0-58.8)

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