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Yanmar 4TNV98CT Engine

The Yanmar 4TNV98CT is a 4-stroke 4-cylinder direct injection turbocharged liqiud-cooled diesel engine from TNV series. A 202.5 cu.in (3.3 L) engine has a cylinder bore of 3.86" (98 mm), piston stroke of 4.33" (110 mm), and rated power of 87 Hp (64 kW) at 2600 rpm. The compression ratio rating is 17.9:1. The Yanmar 4TNV98CT engine is equipped with a high-pressure common rail injection system, forced lubrication with trochoid pump, dual element air cleaner, and starting system with electric starter. The operating weight is 660 lbs (300 kg).

General Technical Data

Engine Specifications

Engine Model .................. Yanmar 4TNV98CT
Engine Type .................. 4-cycle vertical four-cylinder liquid-cooled diesel
Number of Cylinders .................. 4
Displacement, cu.in (L) .................. 202.5 (3.32)
Cylinder Bore, in (mm) .................. 3.86 (98.0)
Piston Stroke, in (mm) .................. 4.33 (110.0)
Rated Power, hp (kW) .................. 87.0 (64.0)
Rated Speed, rpm .................. 2600
Idling Speed, rpm .................. 1400
Aspiration Type .................. Turbocharged
Compression Ratio .................. 17.9:1
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

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

Dimensions and Weight

Overall Lenght, in (mm) .................. 37.3 (945)
Overall Width, in (mm) .................. 24.8 (630)
Overall Height, in (mm) .................. 31.9 (810)
Net Weight, lbs (kg) .................. 660 (300)

Maintenance Data

Engine Oil

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) .................. 11.0 (10.5)

Cylinder and Valves

Compression Pressure, psi (MPa) .................. 483-513 (3.33-3.53)
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)

Oil Pressure and Coolant Capacity

Lubrication Pressure (1500 rpm), psi (MPa) .................. 42-57 (0.29-0.39)
Lubrication Pressure (2500 rpm), psi (MPa) .................. 42-57 (0.29-0.39)
Coolant Capacity (Engine), qts (L) .................. 4.4 (4.2)

Service Specifications

Cylinder Block

Cylinder Bore Inside Diameter (Std), mm (in) .................. 98.00-98.03 (3.8583-3.8594)
Cylinder Bore Inside Diameter (Wear Limit), mm (in) .................. 98.13 (3.8634)
Crankshaft End Play, mm (in) .................. 0.13-0.23 (0.0051-0.0091)
Connecting Rod Journal Outside Diameter, mm (in) .................. 57.952-57.962 (2.2816-2.2820)
Connecting Rod Bearing Inside Diameter, mm (in) .................. 58.000-58.026 (2.2835-2.2845)
Main Bearing Journal Outside Diameter, mm (in) .................. 64.952-64.962 (2.5572-2.5576)
Main Bearing Inside Diameter, mm (in) .................. 65.000-65.020 (2.5590-2.5598)
Crankshaft Journal Bend, mm (in) .................. 0.020 (0.0008)
Piston Outside Diameter (Std), mm (in) .................. 97.940-97.950 (3.8559-3.8563)
Piston Outside Diameter (Wear Limit), mm (in) .................. 97.90 (3.8545)
Piston Pin Outside Diameter, mm (in) .................. 29.995-30.000 (1.1809-1.1811)
Piston Pin Hole Diameter, mm (in) .................. 30.000-30.009 (1.1811-1.1815)
Piston to Piston Pin Clearance, mm (in) .................. 0.014 (0.0006)
Top Ring Width, mm (in) .................. 1.94-1.96 (0.0764-0.0772)
Top Ring Side Clearance, mm (in) .................. 0.080-0.120 (0.0031-0.0047)
Top Ring End Gap, mm (in) .................. 0.25-0.45 (0.0098-0.0177)
Second Ring Width, mm (in) .................. 1.97-1.99 (0.0777-0.0785)
Second Ring Side Clearance, mm (in) .................. 0.090-0.125 (0.0035-0.0049)
Second Ring End Gap, mm (in) .................. 0.45-0.65 (0.0177-0.0256)
Oil Ring Width, mm (in) .................. 2.97-2.99 (0.1169-0.1177)
Oil Ring Side Clearance, mm (in) .................. 0.025-0.060 (0.0010-0.0024)
Oil Ring End Gap, mm (in) .................. 0.25-0.45 (0.0098-0.0177)

Cylinder Head and Valves

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) .................. 0.040-0.070 (0.0016-0.0028)
Exhaust Valve Stem Bend, mm (in) .................. 0.045-0.075 (0.0018-0.0030)
Intake Valve Stem Outside Diameter, mm (in) .................. 6.945-7.960 (0.2734-0.2740)
Exhaust Valve Stem Outside Diameter, mm (in) .................. 6.940-7.955 (0.2732-0.2738)
Intake Valve Guide Inside Diameter, mm (in) .................. 7.000-7.015 (0.2756-0.2762)
Exhaust Valve Guide Inside Diameter, mm (in) .................. 7.000-7.015 (0.2756-0.2762)
Intake Valve Spring Free Length, mm (in) .................. 47.5 (1.87)
Exhaust Valve Spring Free Length, mm (in) .................. 47.5 (1.87)
Intake Cam Lobe Height, mm (in) .................. 42.435-42.565 (1.671-1.676)
Exhaust Cam Lobe Height, mm (in) .................. 42.435-42.565 (1.671-1.676)
Camshaft End Play, mm (in) .................. 0.05-0.20 (0.0020-0.0079)
Camshaft Outside Diameter (Gear Side), mm (in) .................. 49.925-49.950 (1.9655-1.9665)
Camshaft Outside Diameter (Intermediate), mm (in) .................. 49.910-49.935 (1.9650-1.9659)
Camshaft Outside Diameter (Flywheel Side), mm (in) .................. 49.925-49.950 (1.9655-1.9665)

Tightening Torque Specs

Cylinder Head Bolt, Nm (ft-lb) .................. 103-113 (76-83)
Connecting Rod Bolt, Nm (ft-lb) .................. 54-59 (40-43)
Flywheel Bolt, Nm (ft-lb) .................. 186-206 (137-152)
Main Bearing Cap Bolt, Nm (ft-lb) .................. 108-118 (80-87)
Crankshaft Pulley Bolt, Nm (ft-lb) .................. 108-128 (80-94)
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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• Yanmar Engines Specifications
  
• Yanmar 4TNV86CT Specs
  
• Yanmar 4TNV88C Specs
  
• Yanmar 4TNV94FHT Specs
  
• Yanmar 4TNV94L Specs
  
• Yanmar 4TNV98C Specs
  

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