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Yanmar 3T80J Engine

General Technical Data

Engine Specifications

Engine Model ............... Yanmar 3T80J
Engine Type ............... 4-cycle vertical inline 3-cylinder liquid-cooled diesel
Number of Cylinders ............... 3
Cylinder Arrangement ............... In-line
Engine Bore, in (mm) ............... 3.15 (80.0)
Engine Stroke, in (mm) ............... 3.35 (85.0)
Displacement, cu.in (L) ............... 78.2 (1.281)
Rated Engine Power, hp (kW) ............... 25.0 (18.6)
Rated Engine Speed, rpm ............... 2600
Gross Power, hp (kW) ............... 25.0 (18.6) at 2600 rpm
Net Flywheel Power, hp (kW) ............... 22.3 (16.6) at 2600 rpm
Maximum No-Load Speed, rpm ............... 2800-2850
Minimum Idle Speed, rpm ............... 700-800
Peak Torque, lb-ft (Nm) ............... 55.3 (75.0) at 1700 rpm
Aspiration Type ............... Naturally Aspirated
Combustion System ............... Indirect Injection (Swirl Chamber)
Compression Ratio ............... 21.2:1
Firing Order ............... 1-3-2
Rotation Direction ............... Counter-clockwise viewed from flywheel side
Cylinder Block Type ............... High-strength cast iron monoblock
Cylinder Liner Design ............... Parent bore cast iron integral cylinder walls
Cylinder Head Type ............... One-piece cast iron crossflow overhead valve
Lubrication System ............... Full forced pressure lubrication by trochoid pump
Oil Pump Type ............... Trochoid gear-driven pump
Oil Filter Type ............... Full-flow, spin-on cartridge element
Cooling System ............... Liquid-cooled forced circulation with radiator
Water Pump Type ............... Belt-driven centrifugal water pump
Cooling Fan Type ............... Suction or pusher type engine-driven fan
Air Cleaner Type ............... Dry dual-stage paper element filter
Starting System ............... Electric starter motor assistance
Electrical System ............... 12V
Alternator Capacity ............... 35 or 55A

Fuel System

Fuel Injection Pump Type ............... In-line Bosch type Yi-series mechanical pump
Fuel Feed Pump Type ............... Mechanical piston element type with hand primer
Fuel Injection Nozzle Type ............... Throttle type pintle nozzle assembly
Fuel Injection Pressure, psi (MPa) ............... 1991-2133 (13.7-14.7)
Fuel Injection Timing, deg bTDC ............... 18 degrees BTDC
Governor Type ............... Mechanical centrifugal all-speed governor
Fuel Filter Type ............... Spin-on cartridge with built-in water separator
Fuel Transfer Line Material ............... High-pressure double-walled steel tubing
Fuel Leak-off Line Path ............... Return line routed to fuel tank reservoir
Fuel Tank Minimum Flow Capacity, gph (L/h) ............... 3.96 (15.0)
Maximum Fuel Inlet Restriction, inHg (kPa) ............... 3.94 (13.3)
Maximum Fuel Return Line Restriction, inHg (kPa) ............... 5.91 (20.0)
Fuel Priming Pump Type ............... Manual mechanical plunger type pump
Recommended Fuel Type ............... Ultra-low sulfur diesel ASTM D975 No. 2-D
Governor Regulation Performance, % ............... 8.0 to 10.0
Plunger Diameter, in (mm) ............... 0.236 (6.0)
Plunger Stroke, in (mm) ............... 0.276 (7.0)

Dimensions and Weight

Overall Length, in (mm) ............... 21.6 (550)
Overall Width, in (mm) ............... 18.5 (470)
Overall Height, in (mm) ............... 22.8 (580)
Dry Weight Without Accessories, lbs (kg) ............... 320 (145)
Wet Weight With Fluids, lbs (kg) ............... 346 (157)

Maintenance Data

Service Information

Standard Compression Pressure, psi (MPa) ............... 426.7 (2.94)
Minimum Compression Pressure, psi (MPa) ............... 341.3 (2.35)
Compression Variance Between Cylinders, psi (MPa) ............... 28.4 (0.196)
Oil Pressure at Rated Speed, psi (kPa) ............... 42.6-56.8 (294.0-392.0)
Oil Pressure at Idle Speed, psi (kPa) ............... 7.1 (49.0)
Cooling System Cap Pressure Rating, psi (kPa) ............... 12.8 (88.3)
Maximum Oil Temperature, F (C) ............... 230.0 (110.0)
Normal Coolant Temperature Range, F (C) ............... 167.0-194.0 (75.0-90.0)
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 15W-40
API Service Classifications ......................... CC or CD
Engine Oil Capacity with Filter, qt (L) ............... 4.02 (3.8)
Engine Oil Capacity without Filter, qt (L) ............... 3.59 (3.4)
Cooling System Fluid Capacity, qt (L) ............... 6.00 (5.68)

Service Intervals

Change engine oil ............... Every 100 hours
Replace oil filter ............... Every 200 hours
Replace fuel filter ............... Every 200 hours
Service air filter ............... Every 50 hours
Replace air filter ............... Every 500 hours
Change coolant ............... Every 1000 hours
Valve-lash adjustment ............... Every 400 hours
Check fuel system ............... Every 400 hours
Compression test ............... Every 800 hours
Belt inspection ............... Every 100 hours

Service Specifications

Cylinder Bore Inner Diameter, in (mm) ............... 3.1496-3.1512 (80.000-80.040)
Cylinder Bore Maximum Wear Limit, in (mm) ............... 3.1575 (80.200)
Cylinder Bore Out-of-Roundness, in (mm) ............... 0.0012 (0.030)
Main Journal Outer Diameter, in (mm) ............... 1.9665-1.9675 (49.950-49.975)
Crankpin Outer Diameter, in (mm) ............... 1.7697-1.7707 (44.950-44.975)
Crankshaft End Play, in (mm) ............... 0.0043-0.0091 (0.110-0.230)
Crankshaft Main Bearing Clearance, in (mm) ............... 0.0015-0.0035 (0.038-0.090)
Connecting Rod Big End Bearing Clearance, in (mm) ............... 0.0015-0.0033 (0.038-0.083)
Connecting Rod Side Clearance, in (mm) ............... 0.0079-0.0157 (0.200-0.400)
Piston Skirt Outer Diameter, in (mm) ............... 3.1461-3.1476 (79.910-79.950)
Piston to Cylinder Wall Clearance, in (mm) ............... 0.0020-0.0035 (0.050-0.090)
Piston Pin Outer Diameter, in (mm) ............... 0.9449-0.9453 (24.000-24.010)
Piston Pin Bore Inner Diameter, in (mm) ............... 0.9457-0.9465 (24.020-24.040)
Piston Pin to Small End Bushing Clearance, in (mm) ............... 0.0004-0.0016 (0.010-0.040)
Top Ring Groove Width, in (mm) ............... 0.0787-0.0795 (2.000-2.020)
Second Ring Groove Width, in (mm) ............... 0.0787-0.0795 (2.000-2.020)
Oil Ring Groove Width, in (mm) ............... 0.1575-0.1583 (4.000-4.020)
Top Ring Side Clearance, in (mm) ............... 0.0027-0.0043 (0.070-0.110)
Second Ring Side Clearance, in (mm) ............... 0.0016-0.0031 (0.040-0.080)
Oil Ring Side Clearance, in (mm) ............... 0.0008-0.0024 (0.020-0.060)
Top Ring End Gap, in (mm) ............... 0.0079-0.0157 (0.200-0.400)
Second Ring End Gap, in (mm) ............... 0.0079-0.0157 (0.200-0.400)
Oil Ring End Gap, in (mm) ............... 0.0079-0.0157 (0.200-0.400)
Cylinder Head Flatness Distortion, in (mm) ............... 0.0020 (0.050)
Cylinder Block Top Surface Flatness, in (mm) ............... 0.0020 (0.050)
Intake Valve Stem Outer Diameter, in (mm) ............... 0.2736-0.2744 (6.950-6.970)
Exhaust Valve Stem Outer Diameter, in (mm) ............... 0.2732-0.2740 (6.940-6.960)
Valve Guide Bushing Inner Diameter, in (mm) ............... 0.2756-0.2762 (7.000-7.015)
Intake Valve Stem to Guide Clearance, in (mm) ............... 0.0012-0.0026 (0.030-0.065)
Exhaust Valve Stem to Guide Clearance, in (mm) ............... 0.0016-0.0030 (0.040-0.075)
Valve Seat Angle, deg ............... 45
Valve Sinkage Depth, in (mm) ............... 0.0276-0.0354 (0.700-0.900)
Valve Spring Free Length, in (mm) ............... 1.4961 (38.000)
Camshaft Journal Outer Diameter, in (mm) ............... 1.6516-1.6526 (41.950-41.975)
Camshaft Journal Bearing Clearance, in (mm) ............... 0.0010-0.0035 (0.025-0.090)
Cam Height (Intake), in (mm) ............... 1.3346-1.3386 (33.900-34.000)
Cam Height (Exhaust), in (mm) ............... 1.3346-1.3386 (33.900-34.000)
Rocker Arm Bushing Inner Diameter, in (mm) ............... 0.4724-0.4731 (12.000-12.018)
Rocker Arm Shaft Outer Diameter, in (mm) ............... 0.4711-0.4719 (11.966-11.984)
Rocker Arm Bushing to Shaft Clearance, in (mm) ............... 0.0006-0.0020 (0.016-0.052)

Tightening Torques

Cylinder Head M10 Bolt, lb-ft (Nm) ............... 54.2-57.8 (73.5-78.5)
Cylinder Head M9 Bolt, lb-ft (Nm) ............... 43.4-47.0 (58.8-63.7)
Connecting Rod Cap Bolt, lb-ft (Nm) ............... 32.5-36.2 (44.1-49.0)
Main Bearing Cap Bolt, lb-ft (Nm) ............... 54.2-57.8 (73.5-78.5)
Flywheel Mounting Bolt, lb-ft (Nm) ............... 57.8-65.1 (78.5-88.3)
Crankshaft V-Pulley Nut, lb-ft (Nm) ............... 86.8-93.9 (117.7-127.4)
Rocker Shaft Support Bolt, lb-ft (Nm) ............... 18.1-21.7 (24.5-29.4)
Rocker Arm Adjusting Lock Nut, lb-ft (Nm) ............... 10.8-14.5 (14.7-19.6)
Fuel Injection Nozzle Holder Nut, lb-ft (Nm) ............... 43.4-50.6 (58.8-68.6)
Fuel Injection Nozzle Case Nut, lb-ft (Nm) ............... 28.9-36.2 (39.2-49.0)
Fuel Pump Delivery Valve Holder, lb-ft (Nm) ............... 28.9-32.5 (39.2-44.1)
Fuel High Pressure Pipe Nut, lb-ft (Nm) ............... 18.1-21.7 (24.5-29.4)
Oil Drain Plug, lb-ft (Nm) ............... 36.2-43.4 (49.0-58.8)
Oil Pressure Switch, lb-ft (Nm) ............... 10.8-14.5 (14.7-19.6)
Glow Plug, lb-ft (Nm) ............... 10.8-14.5 (14.7-19.6)
Exhaust Manifold Mounting Nut, lb-ft (Nm) ............... 18.1-21.7 (24.5-29.4)
Intake Manifold Mounting Bolt, lb-ft (Nm) ............... 14.5-18.1 (19.6-24.5)
Water Pump Mounting Bolt, lb-ft (Nm) ............... 14.5-18.1 (19.6-24.5)
Starter Motor Mounting Bolt, lb-ft (Nm) ............... 28.9-36.2 (39.2-49.0)
Alternator Mounting Bolt, lb-ft (Nm) ............... 14.5-18.1 (19.6-24.5)
Alternator Adjusting Lock Bolt, lb-ft (Nm) ............... 10.8-14.5 (14.7-19.6)
Flywheel Housing Mounting Bolt, lb-ft (Nm) ............... 18.1-21.7 (24.5-29.4)
Timing Gear Case Cover Bolt, lb-ft (Nm) ............... 14.5-18.1 (19.6-24.5)
Oil Pan Mounting Bolt, lb-ft (Nm) ............... 7.2-10.8 (9.8-14.7)
Valve Cover Cap Nut, lb-ft (Nm) ............... 5.1-7.2 (6.9-9.8)
Fuel Feed Pump Mounting Bolt, lb-ft (Nm) ............... 7.2-10.8 (9.8-14.7)

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