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Yanmar 4TNE88 Engine

The Yanmar 4TNE88 is a four-stroke vertical four-cylinder direct injection naturally aspirated liqiud-cooled diesel engine from TNE series. A 133.6 cubic inches (2.2 L) engine has a cylinder bore of 3.47" (88 mm), piston stroke of 3.55" (90 mm), and rated power of 48.3 Hp (36.1 kW) at 3000 rpm. The compression ratio rating is 18:1. The Yanmar 4TNE88 engine is equipped with a mechanical fuel injection pump, air cleaner with dual element, forced lubrication with trochoid pump, and starting system with electric starter. The operating weight is 374 lbs (170 kg).

General Technical Data

Engine Specifications

Engine Model .................. Yanmar 4TNE88
Engine Type .................. 4-cycle vertical four-cylinder liquid-cooled diesel
Number of Cylinders .................. 4
Displacement, cu.in (L) .................. 133.6 (2.19)
Cylinder Bore, in (mm) .................. 3.47 (88.0)
Piston Stroke, in (mm) .................. 3.55 (90.0)
Maximum Power, hp (kW) .................. 48.3 (36.1)
Maximum Speed, rpm .................. 3000
Idling Speed, rpm .................. 2200
Aspiration Type .................. Naturally aspirated
Compression Ratio .................. 18:1
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
Starting System .................. Electric Starter
Electrical System Rating, Volts .................. 12
Charging System .................. Alternator

Fuel System

Fuel System .................. Direct injection
Fuel Pump Type .................. Mechanical
Fuel Filter Type .................. Replaceable element
Governor Type .................. Mechanical, centrifugal
Fuel Type .................. Diesel Fuel

Dimensions and Weight

Overall Lenght, in (mm) .................. 24.9 (630)
Overall Width, in (mm) .................. 19.7 (500)
Overall Height, in (mm) .................. 24.5 (620)
Net Weight, lbs (kg) .................. 374 (170)

Maintenance Data

Engine Oil

Engine Oil Type (Summer) .................. SAE 10W-30
Engine Oil Type (Winter) ......................... SAE 5W-20
API Service Classifications ......................... CC or higher
Engine Oil Capacity, qts (L) .................. 8.3 (7.9)

Cylinder and Valves

Compression Pressure, psi (MPa) .................. 500 (3.43)
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)

Fuel System and Coolant Capacity

Fuel Injection Timing (FlD, BTDC), deg .................. 16±1
Fuel injection Pressure, psi (MPa) .................. 2840 (19.6)
Coolant Capacity (Engine), qts (L) .................. 2.8 (2.7)

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 Journal Outside Diameter, mm (in) .................. 53.952-53.962 (2.1283-2.1287)
Crank Journal to Bushing Oil Clearance, mm (in) .................. 0.038-0.068 (0.0015-0.0027)
Crankshaft Journal Bend, mm (in) .................. 0.020 (0.0008)
Crankpin Bushing Inside Diameter, mm (in) .................. 51.000-51.010 (2.0118-2.0122)
Crankpin Outside Diameter, mm (in) .................. 47.952-47.962 (1.8916-1.8920)
Piston Outside Diameter (Std), mm (in) .................. 87.945-87.975 (3.4692-3.4704)
Piston Outside Diameter (Wear Limit), mm (in) .................. 87.90 (3.4675)
Piston to Cylinder Clearance, mm (in) .................. 0.04-0.07 (0.0016-0.0028)
Piston Pin Outside Diameter, mm (in) .................. 25.987-26.00 (1.0251-1.0256)
Piston Pin Hole Diameter, mm (in) .................. 26.00-26.009 (1.0256-1.0260)
Piston to Piston Pin Clearance, mm (in) .................. 0.022 (0.0009)
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 Seat Width, mm (in) .................. 1.07-1.24 (0.0422-0.0489)
Exhaust Valve Seat Width, mm (in) .................. 1.24-1.45 (0.0489-0.0572)
Intake Valve Stem Outside Diameter, mm (in) .................. 7.955-8.025 (0.3138-0.3166)
Exhaust Valve Stem Outside Diameter, mm (in) .................. 7.955-8.030 (0.3138-0.3168)
Intake Valve Guide Inside Diameter, mm (in) .................. 7.975-8.010 (0.3146-0.3160)
Exhaust Valve Guide Inside Diameter, mm (in) .................. 7.970-8.015 (0.3144-0.3162)
Intake Valve Stem to Valve Guide Clearance, mm (in) .................. 0.035-0.070 (0.0014-0.0028)
Exhaust Valve Stem to Valve Guide Clearance, mm (in) .................. 0.045-0.075 (0.0018-0.0030)
Intake Valve Head Thickness, mm (in) .................. 1.244-1.444 (0.0491-0.0570)
Exhaust Valve Head Thickness, mm (in) .................. 1.35-1.55 (0.0533-0.0611)
Intake Valve Spring Free Length, mm (in) .................. 42.0 (1.657)
Exhaust Valve Spring Free Length, mm (in) .................. 42.0 (1.657)
Camshaft Journal Outside Diameter (Gear Side), mm (in) .................. 44.925-44.950 (1.7722-1.7732)
Camshaft Journal Clearance (Gear Side), mm (in) .................. 0.040-0.130 (0.0016-0.0051)
Camshaft Journal Outside Diameter (Intermediate), mm (in) .................. 44.910-44.935 (1.7716-1.7726)
Camshaft Journal Clearance (Intermediate), mm (in) .................. 0.065-0.115 (0.0026-0.0045)
Camshaft Journal Outside Diameter (Flywheel Side), mm (in) .................. 44.925-44.950 (1.7722-1.7732)
Camshaft Journal Clearance (Flywheel Side), mm (in) .................. 0.05-0.10 (0.002-0.004)

Tightening Torque Specs

Cylinder Head Bolt, Nm (ft-lb) .................. 85-91 (63-67)
Connecting Rod Bolt, Nm (ft-lb) .................. 44-54 (32-40)
Flywheel Bolt, Nm (ft-lb) .................. 83-88 (61-65)
Metal Cap Bolt, Nm (ft-lb) .................. 96-100 (71-74)
Crankshaft V-Pulley Bolt, Nm (ft-lb) .................. 113-122 (83-90)
Fuel Injection Nozzle Nut, Nm (ft-lb) .................. 7-9 (5-6.5)
Timing Clamping Nut, Nm (ft-lb) .................. 59-69 (43-51)
Governor Support Nut, Nm (ft-lb) .................. 44-49 (32-36)
High Pressure Pipe Sleeve Nut, Nm (ft-lb) ........ 29-34 (22-25)

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