________________________________________________________________________________

Yanmar 3T80U Engine

General Technical Data

Engine Specifications

Engine Model ............... Yanmar 3T80U
Engine Type ............... 4-cycle 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) ............... 78.1 (1.281)
Rated Engine Power, hp (kW) ............... 18-26 (13.4-19.4)
Rated Engine Speed, rpm ............... 2400-2600
Peak Torque ............... 44.2-51.6 lb-ft (60-70 Nm) at 1800-2000 rpm
Idle Speed ............... 700-800 rpm
Aspiration Type ............... Naturally Aspirated
Operating Speed ............... 2400 rpm
Compression Ratio ............... 22.5:1-23.0:1
Firing Order ............... 1-3-2
Cylinder Block Type ............... Cast iron
Cylinder Head Type ............... Cast iron
Lubrication System ............... Full-pressure trochoid pump
Oil Pump Type ............... Trochoid rotor driven by crankshaft
Oil Filter Type ............... Full-flow, spin-on
Cooling System ............... Liquid-cooled centrifugal pump
Water Pump Type ............... Belt-driven, centrifugal
Air Cleaner Type ............... Dry paper element
Starting System ............... Electric Starter
Electrical System ............... 12V

Fuel System

Injection Pump Type ............... Yanmar inline Bosch-type YPES
Governor Type ............... Mechanical centrifugal all-speed governor
Injection Timing ............... 18-22 degrees BTDC
Injection Nozzle Type ............... Throttle type nozzle
Nozzle Opening Pressure, psi (MPa) ............... 1990-2130 (13.7-14.7)
Fuel Filter Type ............... Spin-on cartridge with water separator
Fuel Feed Pump Type ............... Mechanical diaphragm type
Maximum Fuel Consumption, lb/hp-hr (g/kW-hr) ............... 0.410 (250)
Fuel Return Line System ............... Spillover tube back to fuel tank
Fuel Tank Capacity, gal (L) ............... Variable by application

Dimensions and Weight

Overall Length, in (mm) ............... 21.6 (550)
Overall Width, in (mm) ............... 18.9 (480)
Overall Height, in (mm) ............... 23.4 (595)
Dry Weight, lbs (kg) ............... 253-275 (115-125)

Maintenance Data

Service Information

Compression Pressure, Minimum, psi (MPa) ............... 355 (2.45)
Compression Pressure, Standard, psi (MPa) ............... 426 (2.94)
Oil Pressure at Low Idle, psi (MPa) ............... 14.2 (0.098)
Oil Pressure at Rated Speed, psi (MPa) ............... 42.6-56.8 (0.294-0.392)
Thermostat Opening Temperature, F (C) ............... 160 (71)
Thermostat Full Open Temperature, F (C) ............... 185 (85)
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-4
Engine Oil Capacity with Filter, qt (L) ............... 4.2 (4.0)
Engine Oil Capacity without Filter, qt (L) ............... 3.8 (3.6)
Coolant System Capacity, qt (L) ............... 4.8 (4.5)

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 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 Inside Diameter, in (mm) ............... 3.1496-3.1507 (80.000-80.030)
Cylinder Bore Maximum Wear Limit, in (mm) ............... 3.1574 (80.200)
Cylinder Bore Max Out-of-Round, in (mm) ............... 0.0007 (0.020)
Cylinder Block Top Surface Flatness, in (mm) ............... 0.0019 (0.050)
Main Journal Standard Diameter, in (mm) ............... 1.9665-1.9685 (49.950-50.000)
Main Bearing Clearance, in (mm) ............... 0.0015-0.0031 (0.040-0.080)
Main Bearing Shell Thickness, in (mm) ............... 0.078 (2.0)
Crankpin Standard Diameter, in (mm) ............... 1.7696-1.7716 (44.950-45.000)
Crankpin Bearing Clearance, in (mm) ............... 0.0015-0.0031 (0.040-0.080)
Crankshaft Axial End Play Axial, in (mm) ............... 0.0035-0.0082 (0.090-0.210)
Connecting Rod Small End Bushing I.D, in (mm) ............... 0.9059-0.9066 (23.010-23.030)
Connecting Rod Big End Bore I.D, in (mm) ............... 1.8897-1.8905 (48.000-48.020)
Connecting Rod Big End Side Clearance, in (mm) ............... 0.0078-0.0157 (0.200-0.400)
Connecting Rod Bearing Shell Thickness, in (mm) ............... 0.059 (1.5)
Piston Skirt Outer Diameter Standard, in (mm) ............... 3.1468-3.1480 (79.930-79.960)
Piston to Cylinder Bore Clearance, in (mm) ............... 0.0027-0.0039 (0.070-0.100)
Piston Pin Bore Inside Diameter, in (mm) ............... 0.9055-0.9059 (23.000-23.010)
Piston Pin Outer Diameter, in (mm) ............... 0.9051-0.9055 (22.990-23.000)
Piston Pin to Piston Pin Bore Clearance, in (mm) ............... 0.0000-0.0007 (0.000-0.020)
Top Ring Groove Width, in (mm) ............... 0.0807-0.0814 (2.050-2.070)
Second Ring Groove Width, in (mm) ............... 0.0807-0.0814 (2.050-2.070)
Oil Ring Groove Width, in (mm) ............... 0.1582-0.1590 (4.020-4.040)
Top Ring Side Clearance, in (mm) ............... 0.0027-0.0043 (0.070-0.110)
Second Ring Side Clearance, in (mm) ............... 0.0015-0.0031 (0.040-0.080)
Oil Ring Side Clearance, in (mm) ............... 0.0007-0.0023 (0.020-0.060)
Top Ring End Gap, in (mm) ............... 0.0078-0.0157 (0.200-0.400)
Second Ring End Gap, in (mm) ............... 0.0078-0.0157 (0.200-0.400)
Oil Ring End Gap, in (mm) ............... 0.0078-0.0157 (0.200-0.400)
Cylinder Head Bottom Surface Flatness, in (mm) ............... 0.0019 (0.050)
Intake Valve Head Diameter, in (mm) ............... 1.22 (31.0)
Exhaust Valve Head Diameter, in (mm) ............... 1.06 (27.0)
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)
Intake Valve Guide Inner Diameter, in (mm) ............... 0.2755-0.2763 (7.000-7.018)
Exhaust Valve Guide Inner Diameter, in (mm) ............... 0.2755-0.2763 (7.000-7.018)
Intake Valve Stem to Guide Clearance, in (mm) ............... 0.0011-0.0026 (0.030-0.068)
Exhaust Valve Stem to Guide Clearance, in (mm) ............... 0.0015-0.0030 (0.040-0.078)
Valve Seat Angle Intake, deg ............... 45
Valve Seat Angle Exhaust, deg ............... 45
Valve Face Angle Intake, deg ............... 45
Valve Face Angle Exhaust, deg ............... 45
Valve Recess Sinkage, in (mm) ............... 0.0275-0.0354 (0.700-0.900)
Valve Seat Contact Width, in (mm) ............... 0.0433-0.0551 (1.100-1.400)
Valve Spring Free Length, in (mm) ............... 1.6535 (42.000)
Camshaft Journal Outer Diameter (Front), in (mm) ............... 1.5728-1.5748 (39.950-40.000)
Camshaft Journal Outer Diameter (Middle), in (mm) ............... 1.5334-1.5354 (38.950-39.000)
Camshaft Journal Outer Diameter (Rear), in (mm) ............... 1.4940-1.4960 (37.950-38.000)
Camshaft Journal Bearing Clearance, in (mm) ............... 0.0019-0.0039 (0.050-0.100)
Camshaft Cam Height (Intake), in (mm) ............... 1.2578-1.2598 (31.950-32.000)
Camshaft Cam Height (Exhaust), in (mm) ............... 1.2578-1.2598 (31.950-32.000)
Camshaft Axial End Play, in (mm) ............... 0.0019-0.0059 (0.050-0.150)
Rocker Arm Shaft Outer Diameter, in (mm) ............... 0.4716-0.4724 (11.980-12.000)
Rocker Arm Bushing Inner Diameter, in (mm) ............... 0.4728-0.4740 (12.010-12.040)
Rocker Arm to Shaft Clearance, in (mm) ............... 0.0003-0.0023 (0.010-0.060)
Crankshaft Gear to Camshaft Gear Backlash, in (mm) ............... 0.0027-0.0055 (0.070-0.140)
Crankshaft Gear to Idler Gear Backlash, in (mm) ............... 0.0027-0.0055 (0.070-0.140)
Camshaft Gear to Idler Gear Backlash, in (mm) ............... 0.0027-0.0055 (0.070-0.140)

Tightening Torques

Cylinder Head Bolts, lb-ft (Nm) ............... 54.2-57.8 (73.5-78.5)
Connecting Rod Cap Bolts, lb-ft (Nm) ............... 32.5-36.1 (44.1-49.0)
Main Bearing Cap Bolts, lb-ft (Nm) ............... 57.8-61.4 (78.5-83.3)
Flywheel Bolts, lb-ft (Nm) ............... 61.4-65.0 (83.3-88.2)
Crankshaft Pulley Center Bolt, lb-ft (Nm) ............... 65.0-72.3 (88.2-98.0)
Camshaft Thrust Metal Bolts, lb-ft (Nm) ............... 7.2-8.6 (9.8-11.8)
Timing Gear Case Cover Bolts, lb-ft (Nm) ............... 14.4-17.3 (19.6-23.5)
Flywheel Housing Mounting Bolts, lb-ft (Nm) ............... 28.9-32.5 (39.2-44.1)
Rocker Arm Shaft Support Mounting Bolts, lb-ft (Nm) ............... 21.6-25.3 (29.4-34.3)
Valve Clearance Adjuster Jam Nuts, lb-ft (Nm) ............... 10.8-14.4 (14.7-19.6)
Valve Cover Bonnet Nuts, lb-ft (Nm) ............... 5.0-7.2 (6.8-9.8)
Oil Pan Sump Drain Plug, lb-ft (Nm) ............... 36.1-43.3 (49.0-58.8)
Oil Pan Housing Bolts, lb-ft (Nm) ............... 14.4-17.3 (19.6-23.5)
Oil Pressure Relief Valve Plug, lb-ft (Nm) ............... 28.9-36.1 (39.2-49.0)
Oil Filter Bracket Bolts, lb-ft (Nm) ............... 14.4-17.3 (19.6-23.5)
Water Pump Assembly Mounting Bolts, lb-ft (Nm) ............... 14.4-17.3 (19.6-23.5)
Cooling Thermostat Housing Cap Bolts, lb-ft (Nm) ............... 14.4-17.3 (19.6-23.5)
Cooling Fan Blade Bolts, lb-ft (Nm) ............... 7.2-10.8 (9.8-14.7)
Fuel Pump Delivery Valve Holders, lb-ft (Nm) ............... 28.9-32.5 (39.2-44.1)
Fuel Pump Drive Gear Nut, lb-ft (Nm) ............... 43.3-50.6 (58.8-68.6)
Fuel Pump Mounting Flange Stud Nuts, lb-ft (Nm) ............... 14.4-17.3 (19.6-23.5)
Fuel Injection Nozzle Holder Assembly, lb-ft (Nm) ............... 36.1-43.3 (49.0-58.8)
Fuel Injection Nozzle Cap Ring Nut, lb-ft (Nm) ............... 28.9-36.1 (39.2-49.0)
High Pressure Fuel Lines Flare Nuts, lb-ft (Nm) ............... 18.0-21.6 (24.5-29.4)
Fuel Return Line Overflow Pipe Banjo Bolt, lb-ft (Nm) ............... 7.2-10.8 (9.8-14.7)
Fuel Filter Support Base Mounting Bolts, lb-ft (Nm) ............... 14.4-17.3 (19.6-23.5)
Fuel Feed Pump Flange Mounting Nuts, lb-ft (Nm) ............... 7.2-10.8 (9.8-14.7)
Fuel Pump Inspection Side Cover Screws, lb-ft (Nm) ............... 1.4-2.1 (2.0-3.0)
Starter Motor Flange Mounting Nuts, lb-ft (Nm) ............... 28.9-36.1 (39.2-49.0)
Alternator Charging Unit Pivot Bolt, lb-ft (Nm) ............... 14.4-17.3 (19.6-23.5)
Alternator Tension Link Adjuster Bolt, lb-ft (Nm) ............... 10.8-14.4 (14.7-19.6)
Alternator Pulley Shaft Retaining Nut, lb-ft (Nm) ............... 25.3-32.5 (34.3-44.1)
Electric Glow Plugs, lb-ft (Nm) ............... 10.8-14.4 (14.7-19.6)
Oil Pressure Sensor Indicator Switch, lb-ft (Nm) ............... 10.8-14.4 (14.7-19.6)
Coolant Temperature Sensor, lb-ft (Nm) ............... 14.4-21.6 (19.6-29.4)
Exhaust Manifold Mounting Nuts, lb-ft (Nm) ............... 18.0-21.6 (24.5-29.4)
Intake Manifold Mounting Bolts, lb-ft (Nm) ............... 14.4-17.3 (19.6-23.5)

________________________________________________________________________________________

• Yanmar Engines Specs
  
• Yanmar 3T80J Specs
  
• Yanmar 3T84 Specs
  
• Yanmar 3T84HLE Specs
  
• Yanmar 3T90J Specs
  
• Yanmar 3T90T-J Specs
  

________________________________________________________________________________

________________________________________________________________________________________

_______________________________________________________________________________________

________________________________________________________________________________________

________________________________________________________________________________________

________________________________________________________________________________________

________________________________________________________________________________________

________________________________________________________________________________________

________________________________________________________________________________________