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Yanmar 3T72HA Engine

General Technical Data

Engine Specifications

Engine Model ............... Yanmar 3T72HA
Engine Type ............... 4-cycle vertical inline 3-cylinder liquid-cooled diesel
Number of Cylinders ............... 3
Cylinder Arrangement ............... In-line vertical
Engine Bore, in (mm) ............... 2.83 (72.0)
Engine Stroke, in (mm) ............... 2.83 (72.0)
Displacement, cu.in (L) ............... 53.5 (0.879)
Rated Engine Power, hp (kW) ............... 16.0-18.0 (11.9-13.4)
Rated Engine Speed, rpm ............... 2600
Peak Torque ............... 36.8 lb-ft (49.9 Nm) at 1800 rpm
Low Idle Speed, rpm ............... 800-900
High Idle Speed, rpm ............... 2800-2850
Aspiration Type ............... Naturally aspirated
Combustion System ............... Indirect injection (Swirl chamber)
Compression Ratio ............... 23:1
Firing Order ............... 1-3-2
Rotation Direction ............... Counterclockwise viewed from flywheel
Cylinder Block Type ............... High-strength cast iron monoblock
Cylinder Head Type ............... One-piece cast iron crossflow design
Lubrication System ............... Full-pressure forced lubrication
Oil Pump Type ............... Trochoid rotor gear-driven pump
Oil Filter Type ............... Full-flow spin-on cartridge
Cooling System ............... Forced liquid circulation with centrifugal pump
Water Pump Type ............... Belt-driven centrifugal type
Cooling Fan Type ............... Suction or pusher belt-driven index fan
Air Cleaner Type ............... Dry dual-element cyclonic paper filter
Pre-heating System ............... Thermostart glow plug intake heater
Starting System ............... Electric starter motor
Electrical System, V ............... 12
Charging Alternator, V (A) ............... 12 (15)

Fuel System

Injection Pump Type ............... Bosch YPER-0707 in-line mini pump
Fuel Feed Pump Type ............... Mechanical diaphragm type pump
Fuel Injection Timing, deg ............... 14.0-16.0 bTDC
Injection Nozzle Type ............... Throttle/Pintle high-dispersion type
Nozzle Injection Opening Pressure, psi (bar) ............... 1706.0-1849.0 (118.0-128.0)
Main Fuel Filter Type ............... Spin-on element with transparent water separator
Governor Type ............... Mechanical centrifugal all-speed governor
Fuel Transfer Pump Pressure, psi (bar) ............... 2.8-4.3 (0.2-0.3)
Max Fuel Return Pipe Backpressure, psi (bar) ............... 1.4 (0.1)
Fuel Feed Line Diameter, in (mm) ............... 0.23 (6.0)
Fuel Return Line Diameter, in (mm) ............... 0.15 (4.0)
Recommended Fuel Type ............... Diesel No. 2-D (ASTM D975)
Injection Pump Plunger Diameter, in (mm) ............... 0.19 (5.0)
Injection Pump Plunger Stroke, in (mm) ............... 0.27 (7.0)
Governor Regulation Factor, percent ............... 8.0-12.0
Nozzle Holder Assembly Type ............... Screw-in body thread mounting
Nozzle Valve Seat Angle, deg ............... 60.0
Nozzle Needle Valve Diameter, in (mm) ............... 0.15 (4.0)
Nozzle Needle Valve Lift, in (mm) ............... 0.013-0.017 (0.35-0.45)
Maximum Allowable Fuel Temperature, F (C) ............... 122.0 (50.0)

Dimensions and Weight

Overall Length, in (mm) ............... 19.9 (505)
Overall Width, in (mm) ............... 17.5 (445.0)
Overall Height, in (mm) ............... 21.85 (555.0)
Dry Weight, lbs (kg) ............... 220.4 (100.0)
Wet Weight, lbs (kg) ............... 235.8 (107.0)

Maintenance Data

Service Information

Compression Pressure, Standard, psi (bar) ............... 426.0-455.0 (29.4-31.4)
Compression Pressure, Service Limit, psi (bar) ............... 341.0 (23.5)
Max Compression Variation Between Cylinders, psi (bar) ............... 28.4 (1.96)
Oil Pressure at Rated Speed, psi (bar) ............... 42.6-56.8 (2.9-3.9)
EOil Pressure at Low Idle, psi (bar) ............... 9.9 (0.68)
Thermostat Opening Temperature, F (C) ............... 160.0 (71.0)
Thermostat Full Open Temperature, F (C) ............... 185.0 (85.0)

Engine Oil and Coolant

Engine Oil Type .................. SAE 10W-30, SAE 5W-20
API Service Classifications ......................... CD, CE, CF-4
Engine Oil Capacity with Filter, qts (L) ............... 3.4 (3.2)
Engine Oil Capacity (Pan Only), qts (L) ............... 3.0 (2.8)
Cooling System Capacity, qts (L) ............... 4.4 (4.2)

Service Intervals

Change engine oil ............... Every 150 hours
Replace oil filter ............... Every 150 hours
Replace fuel filter ............... Every 250 hours
Service air filter ............... Every 50 hours
Replace air filter ............... Every 250 hours
Change coolant ............... Every 1000 hours
Valve-lash adjustment ............... Every 500 hours
Check fuel system ............... Every 500 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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