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Yanmar 3TNV88C Engine

The Yanmar 3TNV88C is a four-cycle vertical three-cylinder direct injection naturally aspirated liqiud-cooled diesel engine from TNV series. A 100.1 cubic inches (1.64 L) engine has a cylinder bore of 3.47" (88 mm), piston stroke of 3.55" (90 mm), and rated power of 37.3 Hp (27.5 kW) at 3000 rpm. The compression ratio is 19.0:1. The Yanmar 3TNV88C engine is equipped with a high-pressure common rail injection system, air cleaner with dual element, forced lubrication with trochoid pump, and starting system with electric starter. The operating weight is 414 lbs (188 kg).

General Technical Data

Engine Specifications

Engine Model .................. Yanmar 3TNV88C
Engine Type .................. 4-cycle vertical three-cylinder liquid-cooled diesel
Number of Cylinders .................. 3
Displacement, cu.in (L) .................. 100.1 (1.642)
Cylinder Bore, in (mm) .................. 3.47 (88.0)
Piston Stroke, in (mm) .................. 3.55 (90.0)
Rated Power, hp (kW) .................. 37.3 (27.5)
Rated Speed, rpm .................. 3000
Idling Speed, rpm .................. 1800
Aspiration Type .................. Naturally aspirated
Compression Ratio .................. 19:1
Firing Order .................. 1-3-2
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) .................. 30.4 (770)
Overall Width, in (mm) .................. 21.3 (540)
Overall Height, in (mm) .................. 28.6 (725)
Net Weight, lbs (kg) .................. 414 (188)

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) .................. 7.0 (6.7)

Cylinder and Valves

Compression Pressure, psi (MPa) .................. 455-485 (3.14-3.34)
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 (1800 rpm), psi (MPa) .................. 42-64 (0.29-0.44)
Lubrication Pressure (3000 rpm), psi (MPa) .................. 57-78 (0.39-0.54)
Coolant Capacity (Engine), qts (L) .................. 2.1 (2.0)

Service Specifications

Cylinder Block

Cylinder Bore Inside Diameter (Std), mm (in) .................. 88.00-88.03 (3.471-3.473)
Cylinder Bore Inside Diameter (Wear Limit), mm (in) .................. 88.20 (3.479)
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) .................. 87.940-87.970 (3.4622-3.4634)
Piston Outside Diameter (Wear Limit), mm (in) .................. 87.90 (3.4604)
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) .................. 0.070-0.105 (0.0028-0.0041)
Top Ring End Gap, mm (in) .................. 0.2-0.4 (0.0079-0.0158)
Second Ring Width, mm (in) .................. 1.97-1.99 (0.0777-0.0785)
Second Ring Side Clearance, mm (in) .................. 0.035-0.070 (0.0014-0.0028)
Second Ring End Gap, mm (in) .................. 0.2-0.4 (0.0079-0.0158)
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 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) .................. 0.035-0.070 (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 Side), mm (in) .................. 44.925-44.950 (1.7687-1.7697)
Camshaft Outside Diameter (Intermediate), mm (in) .................. 44.910-44.935 (1.7681-1.7691)
Camshaft Outside Diameter (Flywheel Side), mm (in) .................. 44.925-44.950 (1.7687-1.7697)

Tightening Torque Specs

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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