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Yanmar 3T90J Engine

General Technical Data

Engine Specifications

Engine Model ............... Yanmar 3T90J
Engine Type ............... 4-cycle inline 3-cylinder liquid-cooled diesel
Number of Cylinders ............... 3
Cylinder Arrangement ............... Vertical in-line
Engine Bore, in (mm) ............... 3.54 (90.0)
Engine Stroke, in (mm) ............... 3.54 (90.0)
Displacement, cu.in (L) ............... 105 (1.717)
Rated Engine Power, hp (kW) ............... 31 (23.1)
Rated Engine Speed, rpm ............... 2400
Peak Torque ............... 74.5 Nm (55.0 lb-ft) at 1700 rpm
Idle Speed ............... 700-800 rpm
Aspiration Type ............... Naturally Aspirated
Operating Speed ............... 2400 rpm
Compression Ratio ............... 20.4:1
Firing Order ............... 1-3-2
Cylinder Block Type ............... Cast iron mono-block
Cylinder Head Type ............... One-piece cast iron
Lubrication System ............... Full-pressure trochoid pump feed
Oil Pump Type ............... Gear-driven trochoid pump
Oil Filter Type ............... Full-flow, spin-on paper element
Cooling System ............... Liquid-cooled with forced circulation
Water Pump Type ............... Belt-driven centrifugal pump
Air Cleaner Type ............... Dry paper element
Starting System ............... Electric Starter
Electrical System ............... 12V
Alternator Output ............... 15 or 35A

Fuel System

Injection Pump Type ............... Bosch type inline mini pump
Governor Type ............... Mechanical centrifugal all-speed type
Injection Nozzle Type ............... Throttle type
Injection Timing, deg ............... 18-20 BTDC
Injection Feed Pressure, psi (MPa) ............... 1990-2130 (13.7-14.7)
Fuel Filter Type ............... Spin-on cartridge with water separator
Fuel Transfer Pump Type ............... Mechanical diaphragm type
Fuel Tank Capacity, gal (L) ............... 8.5 (32.1)
Fuel Return Line Layout ............... Spillover to fuel tank overflow line
Maximum Fuel Inlet Restriction, inHg (kPa) ............... 4.0 (13.5)
Minimum Fuel Pressure, psi (kPa) ............... 2.8 (19.3)
Maximum Leak-Off Flow, gph (L/h) ............... 0.26 (1.0)

Dimensions and Weight

Overall Length, in (mm) ............... 22.4 (570)
Overall Width, in (mm) ............... 19.3 (490)
Overall Height, in (mm) ............... 24.8 (630)
Dry Weight, lbs (kg) ............... 396 (180)

Maintenance Data

Service Information

Compression Pressure, Minimum, psi (MPa) ............... 398 (2.74)
Oil Pressure at Low Idle, psi (MPa) ............... 14.2 (0.10)
Oil Pressure at Rated Speed, psi (MPa) ............... 42.6-56.8 (0.29-0.39)
Thermostat Opening Temperature, F (C) ............... 160 (71)
Thermostat Full Open Temperature, F (C) ............... 185 (85)
Cooling System Cap Pressure, psi (kPa) ............... 12.8 (88.2)
Fan Belt Deflection, in (mm) ............... 0.4-0.6 (10-15)
Intake Valve Clearance, in (mm) ............... 0.008 (0.20)
Exhaust Valve Clearance, in (mm) ............... 0.008 (0.20)

Engine Oil and Coolant

Engine Oil Type .................. SAE 10W-30, SAE 5W-20
API Service Classifications ......................... CD or CE
Engine Oil Capacity, qt (L) ............... 5.8 (5.5)
Coolant Capacity, qt (L) ............... 6.5 (6.1)

Service Intervals

Change engine oil ............... Every 100 hours
Replace oil filter ............... Every 200 hours
Replace fuel filter ............... Every 300 hours
Service air filter ............... Every 100 hours
Replace air filter ............... Every 500 hours
Change coolant ............... Every 1000 hours
Valve-lash adjustment ............... Every 400 hours
Check fuel system ............... Every 600 hours
Compression test ............... Every 800 hours
Belt inspection ............... Every 100 hours

Service Specifications

Cylinder Bore Inner Diameter, in (mm) ............... 3.5433-3.5441 (90.000-90.022)
Crankshaft Main Journal Outer Diameter, in (mm) ............... 2.1642-2.1648 (54.972-54.985)
Crankpin Journal Outer Diameter, in (mm) ............... 1.8886-1.8892 (47.972-47.985)
Crankshaft Journal Out-of-Roundness, in (mm) ............... 0.0007 (0.02)
Crankshaft End Play, in (mm) ............... 0.004-0.010 (0.11-0.25)
Main Bearing Clearance, in (mm) ............... 0.0014-0.0033 (0.038-0.085)
Connecting Rod Small End Bushing I.D, in (mm) ............... 1.0244-1.0251 (26.020-26.038)
Connecting Rod Bearing Clearance, in (mm) ............... 0.0014-0.0031 (0.038-0.080)
Connecting Rod Big End Side Clearance, in (mm) ............... 0.006-0.014 (0.15-0.35)
Thrust Bearing Thickness, in (mm) ............... 0.0763-0.0783 (1.938-1.988)
Crankshaft Thrust Play, in (mm) ............... 0.0157 (0.40)
Piston Skirt Outer Diameter, in (mm) ............... 3.5397-3.5409 (89.910-89.940)
Piston to Cylinder Bore Clearance, in (mm) ............... 0.0031-0.0044 (0.080-0.112)
Piston Pin Bore Inner Diameter, in (mm) ............... 1.0236-1.0241 (26.000-26.013)
Piston Pin Outer Diameter, in (mm) ............... 1.0236-1.0240 (26.000-26.009)
Piston Pin to Pin Bore Clearance, in (mm) ............... -0.0003 to +0.0005 (-0.009 to +0.013)
Piston Pin to Small End Bushing Clearance, in (mm) ............... 0.0004-0.0014 (0.011-0.038)
Top Ring Groove Width, in (mm) ............... 0.0807-0.0815 (2.050-2.070)
Second Ring Groove Width, in (mm) ............... 0.0795-0.0803 (2.020-2.040)
Oil Ring Groove Width, in (mm) ............... 0.1583-0.1591 (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) ............... 0.0011-0.0027 (0.030-0.070)
Top Ring End Gap, in (mm) ............... 0.0098-0.0157 (0.25-0.40)
Second Ring End Gap, in (mm) ............... 0.0098-0.0157 (0.25-0.40)
Oil Ring End Gap, in (mm) ............... 0.0078-0.0157 (0.20-0.40)
Cylinder Head Surface Flatness, Limit, in (mm) ............... 0.002 (0.05)
Intake Valve Stem Outer Diameter, in (mm) ............... 0.3130-0.3136 (7.950-7.965)
Exhaust Valve Stem Outer Diameter, in (mm) ............... 0.3126-0.3132 (7.940-7.955)
Intake Valve Guide Inner Diameter, in (mm) ............... 0.3150-0.3156 (8.000-8.015)
Exhaust Valve Guide Inner Diameter, in (mm) ............... 0.3150-0.3156 (8.000-8.015)
Intake Valve Stem to Guide Clearance, in (mm) ............... 0.0014-0.0025 (0.035-0.065)
Exhaust Valve Stem to Guide Clearance, in (mm) ............... 0.0017-0.0029 (0.045-0.075)
Valve Seat Angle, deg ............... 45
Valve Sinkage Depth, in (mm) ............... 0.027-0.035 (0.70-0.90)
Valve Seat Contact Width, in (mm) ............... 0.043-0.055 (1.1-1.4)
Valve Spring Free Length, in (mm) ............... 1.637 (41.6)
Camshaft Journal Outer Diameter (Front), in (mm) ............... 1.7303-1.7311 (43.950-43.970)
Camshaft Journal Outer Diameter (Center), in (mm) ............... 1.7283-1.7291 (43.900-43.920)
Camshaft Journal Outer Diameter (Rear), in (mm) ............... 1.7263-1.7271 (43.850-43.870)
Camshaft Bearing Inner Diameter (Front), in (mm) ............... 1.7322-1.7335 (44.000-44.030)
Camshaft Bearing Inner Diameter (Center), in (mm) ............... 1.7303-1.7317 (43.950-43.985)
Camshaft Bearing Inner Diameter (Rear), in (mm) ............... 1.7283-1.7297 (43.900-43.935)
Camshaft Journal to Bearing Clearance, in (mm) ............... 0.0011-0.0031 (0.030-0.080)
Intake Lobe Height, in (mm) ............... 1.3409-1.3421 (34.060-34.090)
Exhaust Lobe Height, in (mm) ............... 1.3409-1.3421 (34.060-34.090)
Camshaft End Play, in (mm) ............... 0.002-0.008 (0.05-0.20)
Rocker Arm Shaft Outer Diameter, in (mm) ............... 0.4716-0.4722 (11.983-11.994)
Rocker Arm Bushing Inner Diameter, in (mm) ............... 0.4724-0.4731 (12.000-12.018)
Rocker Arm to Shaft Clearance, in (mm) ............... 0.0002-0.0013 (0.006-0.035)
Idle Gear Shaft Bushing Inner Diameter, in (mm) ............... 1.4173-1.4183 (36.000-36.025)
Idle Gear Shaft Outer Diameter, in (mm) ............... 1.4153-1.4161 (35.950-35.970)
Idle Gear Shaft to Bushing Clearance, in (mm) ............... 0.0011-0.0029 (0.030-0.075)
Crankshaft Gear to Idler Gear Backlash, in (mm) ............... 0.0027-0.0059 (0.07-0.15)
Camshaft Gear to Idler Gear Backlash, in (mm) ............... 0.0027-0.0059 (0.07-0.15)

Tightening Torques

Cylinder Head Bolt (Stage 1), lb-ft (Nm) ............... 25.3-28.9 (34.3-39.2)
Cylinder Head Bolt (Stage 2), lb-ft (Nm) ............... 54.2-57.8 (73.5-78.4)
Connecting Rod Cap Bolt, lb-ft (Nm) ............... 32.5-36.1 (44.1-49.0)
Main Bearing Cap Bolt, lb-ft (Nm) ............... 72.3-75.9 (98.0-103.0)
Flywheel Mounting Bolt, lb-ft (Nm) ............... 57.8-61.4 (78.4-83.3)
Crankshaft Pulley V-Belt Nut, lb-ft (Nm) ............... 61.4-68.7 (83.3-93.1)
Camshaft Thrust Plate Bolt, lb-ft (Nm) ............... 7.2-8.7 (9.8-11.8)
Camshaft Gear Lock Nut, lb-ft (Nm) ............... 50.6-57.8 (68.6-78.4)
Idle Gear Shaft Bolt, lb-ft (Nm) ............... 17.3-21.7 (23.5-29.4)
Rocker Arm Shaft Support Bolt, lb-ft (Nm) ............... 17.3-21.7 (23.5-29.4)
Rocker Arm Adjusting Nut, lb-ft (Nm) ............... 10.1-13.0 (13.7-17.6)
Cylinder Head Valve Cover Nut, lb-ft (Nm) ............... 5.1-7.2 (6.9-9.8)
Oil Pan Drain Plug, lb-ft (Nm) ............... 36.1-43.4 (49.0-58.8)
Oil pan Mounting Bolt, lb-ft (Nm) ............... 7.2-8.7 (9.8-11.8)
Oil Pump Assembly Base Bolt, lb-ft (Nm) ............... 7.2-8.7 (9.8-11.8)
Gear Case Housing Cover Bolt, lb-ft (Nm) ............... 14.5-17.3 (19.6-23.5)
Flywheel Housing Mounting Bolt, lb-ft (Nm) ............... 28.9-32.5 (39.2-44.1)
Fuel Pump Delivery Valve Holder, lb-ft (Nm) ............... 25.3-28.9 (34.3-39.2)
Fuel Pump Locking Fixing Nut, lb-ft (Nm) ............... 14.5-17.3 (19.6-23.5)
Fuel Injection Nozzle Case Nut, lb-ft (Nm) ............... 28.9-36.1 (39.2-49.0)
Fuel Injection Nozzle Holder Nut, lb-ft (Nm) ............... 36.1-43.4 (49.0-58.8)
Fuel Injection Pipe Flare Gland Nut, lb-ft (Nm) ............... 18.1-21.7 (24.5-29.4)
Fuel Return Line Joint Bolt, lb-ft (Nm) ............... 7.2-10.1 (9.8-13.7)
Fuel Feed Pump Mounting Bolt, lb-ft (Nm) ............... 5.1-7.2 (6.9-9.8)
Water Pump Assembly Mounting Bolt, lb-ft (Nm) ............... 7.2-8.7 (9.8-11.8)
Cooling Water Temperature Sensor, lb-ft (Nm) ............... 14.5-18.1 (19.6-24.5)
Oil Pressure Switch Sensor, lb-ft (Nm) ............... 10.1-13.0 (13.7-17.6)
Thermostat Housing Cover Bolt, lb-ft (Nm) ............... 7.2-8.7 (9.8-11.8)
Exhaust Manifold Mounting Nut, lb-ft (Nm) ............... 17.3-21.7 (23.5-29.4)
Air Intake Manifold Mounting Bolt, lb-ft (Nm) ............... 14.5-17.3 (19.6-23.5)
Starter Motor Mounting Bolt, lb-ft (Nm) ............... 28.9-36.1 (39.2-49.0)
Alternator Pivot Long Bolt, lb-ft (Nm) ............... 14.5-17.3 (19.6-23.5)
Alternator Adjusting Locking Bolt, lb-ft (Nm) ............... 11.6-14.5 (15.7-19.6)
Glow Plug Body, lb-ft (Nm) ............... 10.8-14.5 (14.7-19.6)
Glow Plug Wiring Nut, lb-ft (Nm) ............... 1.1-1.4 (1.5-2.0)
Engine Base Mount Foot Bracket Bolt, lb-ft (Nm) ............... 36.1-43.4 (49.0-58.8)
Breather Valve Cover Plate Screws, lb-ft (Nm) ............... 2.2-3.6 (3.0-4.9)

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• Yanmar 3T90T-J Specs
  

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