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Yanmar 4TNV86CT Specifications

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• Yanmar 4TNV86CT Engine Specifications
• Yanmar 4TNV86CT Engine Troubleshooting

Engine Model .................. Yanmar 4TNV86CT
Engine Type .................. 4-cycle vertical four-cylinder liquid-cooled diesel
Number of Cylinders .................. 4
Displacement, cu.in (L) .................. 127.5 (2.09)
Cylinder Bore, in (mm) .................. 3.39 (86.0)
Piston Stroke, in (mm) .................. 3.55 (90.0)
Rated Power, hp (kW) .................. 59.1 (44.0)
Rated Speed, rpm .................. 3000
Idling Speed, rpm .................. 1800
Aspiration Type .................. Turbocharged
Compression Ratio .................. 19.1:1
Firing Order .................. 1-3-4-2
Lubrication System .................. Forced lubrication with trochoid pump
Oil Filter Type .................. Full flow, replaceable
Air Cleaner Type .................. Dual element
Cooling System .................. Liquid-cooled with radiator
Emission Level .................. Tier 4
Starting System .................. Electric Starter
Electrical System Rating, Volts .................. 12
Charging System .................. Alternator

Fuel System .................. Direct injection
Injection System .................. High-pressure common rail
Fuel Pump Type .................. Electric
Fuel Filter Type .................. Replaceable element
Governor Type .................. Electronic
Fuel Type .................. Diesel Fuel

Overall Lenght, in (mm) .................. 35.3 (895)
Overall Width, in (mm) .................. 21.7 (550)
Overall Height, in (mm) .................. 30.0 (760)
Net Weight, lbs (kg) .................. 495 (225)

Cylinder Bore Inside Diameter (Std), mm (in) .................. 86.00-86.03 (3.386-3.387)
Cylinder Bore Inside Diameter (Wear Limit), mm (in) .................. 86.20 (3.394)
Crankshaft End Play, mm (in) .................. 0.13-0.23 (0.0051-0.0091)
Connecting Rod Journal Outside Diameter, mm (in) .............. 47.952-47.962 (1.8879-1.8883)
Connecting Rod Bearing Inside Diameter, mm (in) ................ 48.000-48.026 (1.8898-1.8909)
Main Bearing Journal Outside Diameter, mm (in) .................. 49.952-49.962 (1.9666-1.9670)
Main Bearing Inside Diameter, mm (in) .................. 50.000-50.020 (1.9685-1.9693)
Crankshaft Journal Bend, mm (in) .................. 0.020 (0.0008)
Piston Outside Diameter (Std), mm (in) .................. 85.940-85.970 (3.3835-3.3846)
Piston Outside Diameter (Wear Limit), mm (in) .................. 85.90 (3.3817)
Piston Pin Outside Diameter, mm (in) .................. 25.995-26.000 (1.0234-1.0236)
Piston Pin Hole Diameter, mm (in) .................. 26.000-26.009 (1.0236-1.0240)
Piston to Piston Pin Clearance, mm (in) .................. 0.014 (0.0006)
Top Ring Width, mm (in) .................. 1.97-1.99 (0.0777-0.0785)
Top Ring Side Clearance, mm (in) .................. 0.075-0.110 (0.0030-0.0043)
Top Ring End Gap, mm (in) .................. 0.2-0.4 (0.0079-0.0158)
Second Ring Width, mm (in) .................. 1.95-1.97 (0.0768-0.0776)
Second Ring Side Clearance, mm (in) .................. 0.045-0.100 (0.0018-0.0039)
Second Ring End Gap, mm (in) .................. 0.3-0.5 (0.0118-0.0197)
Oil Ring Width, mm (in) .................. 3.97-3.99 (0.1566-0.1574)
Oil Ring Side Clearance, mm (in) .................. 0.025-0.060 (0.0010-0.0024)
Oil Ring End Gap, mm (in) .................. 0.2-0.4 (0.0079-0.0158)

Cylinder Head Combustion Surface Distortion, mm (in) .................. 0.05 (0.0020)
Intake Valve Clearance, mm (in) .................. 0.15-0.25 (0.006-0.010)
Exhaust Valve Clearance, mm (in) .................. 0.15-0.25 (0.006-0.010)
Intake Valve Seat Angle, Degrees .................. 120
Exhaust Valve Seat Angle, Degrees .................. 90
Intake Valve Stem Bend, mm (in) .................. 0.035-0.070 (0.0014-0.0028)
Exhaust Valve Stem Bend, mm (in) .................. 0.045-0.075 (0.0018-0.0030)
Intake Valve Stem Outside Diameter, mm (in) .................. 7.955-7.975 (0.3132-0.3140)
Exhaust Valve Stem Outside Diameter, mm (in) .................. 7.955-7.960 (0.3132-0.3134)
Intake Valve Guide Inside Diameter, mm (in) .................. 8.010-8.025 (0.3154-0.3159)
Exhaust Valve Guide Inside Diameter, mm (in) .................. 8.015-8.030 (0.3156-0.3161)
Intake Valve Spring Free Length, mm (in) .................. 42.0 (1.657)
Exhaust Valve Spring Free Length, mm (in) .................. 42.0 (1.657)
Intake Cam Lobe Height, mm (in) .................. 38.6-38.8 (1.52-1.53)
Exhaust Cam Lobe Height, mm (in) .................. 38.6-38.8 (1.52-1.53)
Camshaft End Play, mm (in) .................. 0.05-0.20 (0.0020-0.0079)
Camshaft Outside Diameter (Gear), mm (in) .................. 44.925-44.950 (1.7687-1.7697)
Camshaft Outside Diameter (Center), mm (in) .................. 44.910-44.935 (1.7681-1.7691)
Camshaft Outside Diameter (Flywheel), mm (in) .................. 44.925-44.950 (1.7687-1.7697)

Engine Oil Type (Summer) .................. SAE 10W-30, 15W-40
Engine Oil Type (Winter) ......................... SAE 5W-30
API Service Classifications ......................... CJ-4
Engine Oil Capacity, qts (L) .................. 7.8 (7.4)
Coolant Capacity (Engine), qts (L) .................. 2.8 (2.7)
Compression Pressure, psi (MPa) .................. 411-441 (2.84-3.04)
Intake Valve Clearance, mm (in) .................. 0.15-0.25 (0.006-0.010)
Exhaust Valve Clearance, mm (in) .................. 0.15-0.25 (0.006-0.010)
Lubrication Pressure (1800 rpm), psi (MPa) .................. 42-64 (0.29-0.44)
Lubrication Pressure (3000 rpm), psi (MPa) .................. 52-74 (0.36-0.51)

Cylinder Head Bolt, Nm (ft-lb) .................. 92-98 (68-72)
Connecting Rod Bolt, Nm (ft-lb) .................. 44-49 (32-36)
Flywheel Bolt, Nm (ft-lb) .................. 83-88 (61-65)
Main Bearing Cap Bolt, Nm (ft-lb) .................. 96-100 (71-74)
Crankshaft Pulley Bolt, Nm (ft-lb) .................. 113-122 (83-90)
Glow Plug, Nm (ft-lb) .................. 15-20 (11-15)
Fuel Injector Bolt, Nm (ft-lb) .................. 24.5-28.5 (18-21)
Supply Pump Drive Gear Nut, Nm (ft-lb) .................. 75-85 (55-63)
Crank Rotation Sensor, Nm (ft-lb) .................. 6-10 (4.5-7.5)
Cam Speed Sensor, Nm (ft-lb) .................. 7.5-8.5 (5.5-6.5)
High Pressure Fuel Line Nut, Nm (ft-lb) ........ 29-34 (22-25)

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Gasoline and Diesel Engines Technical Data