Diesel and Gasoline Engines Specifications and Service Data

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Yanmar 3TNE74 Engine

General Technical Data

Yanmar 3TNE74 Engine Specifications

Engine Model .......... Yanmar 3TNE74
Engine Type .......... Vertical, four-cycle water-cooled diesel
Number of Cylinders .......... 3
Engine Bore, in (mm) .......... 2.92 (74.0)
Engine Stroke, in (mm) .......... 3.08 (78.0)
Displacement, (L) .......... 1.006
Maximum Engine Power, hp (kW) .......... 25.6 (19.1)
Maximum Engine Speed, rpm .......... 3600
Fast Idle Speed, rpm .......... 3475 +/-25
Slow Idle Speed, rpm .......... 1600 +/-25
Firing Order .......... 1-3-2
Direction of Rotation .......... Counterclockwise (viewed from flywheel)
Combustion System .......... Special swirl pre-combustion chamber
Compression Ratio .......... 23:1
Compression Pressure, MPa .......... 3.24±0.1
Air Cleaner .......... Primary and Secondary Filters

Fuel System

Fuel Type .......... Diesel Fuel
Fuel Diesel Type .......... Diesel No.1 or No.2
Fuel Pump Type .......... Mechanical
Fuel Delivery .......... In-line indirect injection
Fuel Filter .......... Replaceable Element
Fuel Injection Timing (FlD, B.T.D.C.) deg .......... 16±1
Fuel injection Pressure, MPa .......... 11.8
Governor .......... Mechanical centrifugal

Lubrication System

Lubrication System Type .......... Forced lubrication with trochoid pump
Oil Filter .......... Full Flow, Replaceable
Lubricating Oil Capacity, qt (L) .......... 3.0 (2.8)

Cooling System

Cooling System Type .......... Liquid cooling / Radiator
Cooling System Capacity, qt (L) .......... 3.0 (2.8)
Cooling Fan Type .......... Pusher
Cooling Fan Number of Blade .......... 6
Cooling Fan Diameter, in (mm) .......... 13.3 (335)

Electrical System

Electrical System Rating, Volts .......... 12
Starting system .......... Electric Starter
Starter Rating .......... 0.8kW (12-Volt)
Charging System .......... Alternator
Alternator Rating, Amp .......... 20
Battery .......... 500 CCA (cold cranking amps)

Dimensions

Width, in (mm) .......... 17.4 (440)
Height, in (mm) .......... 19.8 (502)
Depth, in (mm) .......... 18.9 (477)
Weight, lbs (kg) .......... 225 (102)

Yanmar 3TNE74 Maintenance Data

Engine oil type .......... SAE 15W-40/5W-30
Engine oil capacity, qt (L) .......... 2.5 (2.4)
Coolant capacity, qt (L) .......... 3.7 (3.5)
Oil filter change interval .......... Every 250 hours
Oil change interval .......... Every 250 hours
Fuel filter change interval .......... Every 250 hours

Yanmar 3TNE74 Service Specifications

Cylinder block components

Cylinder bore (Std), mm (in) .......... 74,00-74,03 (2,9249-2,9261)
Cylinder bore (Wear limit), mm (in) .......... 74,20 (2,9328)
Camshaft journal outside diameter (Gear side), mm (in) .......... 39,940-39,960 (1,5787-1,5794)
Camshaft oil clearance (Gear side), mm (in) .......... 0,040-0,085 (0,0016-0,0034)
Camshaft journal outside diameter (Intermediate), mm (in) .......... 39,910-39,935 (1,5775-1,5785)
Camshaft oil clearance (Intermediate), mm (in) .......... 0,065-0,115 (0,0026-0,0045)
Camshaft journal outside diameter (Flywheel side), mm (in) .......... 39,940-39,960 (1,5787-1,5794)
Camshaft oil clearance (Flywheel side), mm (in) .......... 0,040-0,125 (0,0016-0,0049)
Crankshaft journal outside diameter, mm (in) .......... 43,970-43,980 (1,7379-1,7383)
Bearing metal thickness, mm (in) .......... 1,987-2,000 (0,0785-0,0791)
Crank journal and bushing oil clearance, mm (in) .......... 0,033-0,059 (0,0013-0,0023)
Crankshaft journal bend, mm (in) .......... 0,020 (0,0008)

Cylinder head and valves

Cylinder head combustion surface distortion, mm (in) .......... 0,05 (0,0020)
Intake valve seat angle, degrees .......... 120
Exhaust valve seat angle, degrees .......... 90
Intake valve seat width, mm (in) .......... 1,44 (0,0569)
Exhaust valve seat width, mm (in) .......... 1,77 (0,0700)
Intake valve alve stem outside diameter, mm (in) .......... 6,96-6,98 (0,2751-0,2757)
Intake valve guide inside diameter, mm (in) .......... 7,01-7,02 (0,2769-0,2775)
Intake valve oil clearance, mm (in) .......... 0,03-0,06 (0,0012-0,0024)
Exhaust valve stem outside diameter, mm (in) .......... 6,95-6,96 (0,2745-0,2751)
Exhaust valve guide inside diameter, mm (in) .......... 7,01-7,02 (0,2769-0,2775)
Exhaust valve oil clearance, mm (in) .......... 0,05-0,08 (0,0018-0,0030)
Valve guide projection, mm (in) .......... 9,00 (0,3557)
Intake valve sinking depth, mm (in) .......... 0,40-0,60 (0,0158-0,0237)
Exhaust valve sinking depth, mm (in) .......... 0,40-0,60 (0,0158-0,0237)
Thickness of intake valve head, mm (in) .......... 0,99-1,29 (0,0391-0,0510)
Thickness of exhaust valve head, mm (in) .......... 0,95-1,25 (0,0375-0,0494)
Intake valve timing (Open), degrees .......... 7-17
Intake valve timing (Close), degrees .......... 35-45
Exhaust valve timing (Open), degrees .......... 40-50
Exhaust valve timing (Close), degrees .......... 8-18
Valve spring free length, mm (in) .......... 37,40 (1,4783)
Intake and exhaust valve clearance, mm (in) .......... 0,15-0,25 (0,0059-0,0099)

Rocker arm and tappet

Rocker arm shaft outside diameter, mm (in) .......... 11,97-11,98 (0,4730-0,4737)
Rocker arm bushing inside diameter, mm (in) .......... 12,00-12,02 (0,4743-0,4751)
Rocker arm clearance, mm (in) .......... 0,02-0,05 (0,0006-0,0021)
Pushrod bending, mm (in) .......... 0,03 (0,0012)
Tappet stem outside diameter, mm (in) .......... 20,93-20,96 (0,8272-0,8285)
Tappet guide hole inside diameter, mm (in) .......... 21,00-21,02 (0,8300-0,8309)
Tappet clearance, mm (in) .......... 0,04-0,09 (0,0016-0,0037)

Pistons and piston rings

Piston outside diameter (Std), mm (in) .......... 73,94-73,97 (2,9225-2,9237)
Piston outside diameter (Wear limit), mm (in) .......... 73,90 (2,9209)
Min. clearance between piston and cylinder, mm (in) .......... 0,05-0,08 (0,0018-0,0030)
Top clearance, mm (in) .......... 0,66-0,78 (0,0260-0,0308)
Piston pin outside diameter, mm (in) .......... 20,99-21,00 (0,8297-0,8300)
Piston pin hole diameter, mm (in) .......... 21,00-21,01 (0,8300-0,8304)
Piston pin clearance, mm (in) .......... 0,00-0,02 (0,0000-0,0007)
Top ring groove width, mm (in) .......... 1,550-1,570 (0,0613-0,0621)
Top ring width, mm (in) .......... 1,470-1,490 (0,0581-0,0589)
Top ring minimum side clearance, mm (in) .......... 0,060-0,100 (0,0024-0,0040)
Top ring end clearance, mm (in) .......... 0,200-0,400 (0,0079-0,0158)
Second ring groove width, mm (in) .......... 1,520-1,535 (0,0601-0,0607)
Second ring width, mm (in) .......... 1,410-1,430 (0,0557-0,0565)
Second ring minimum side clearance, mm (in) .......... 0,090-0,125 (0,0036-0,0049)
Second ring end clearance, mm (in) .......... 0,200-0,400 (0,0079-0,0158)
Oil ring groove width, mm (in) .......... 3,010-3,025 (0,1190-0,1196)
Oil ring width, mm (in) .......... 2,970-2,990 (0,1174-0,1182)
Oil ring minimum side clearance, mm (in) .......... 0,020-0,055 (0,0008-0,0022)
Oil ring end clearance, mm (in) .......... 0,150-0,350 (0,0059-0,0138)
Crankpin bushing inside diameter, mm (in) .......... 43,000-43,016 (1,6996-1,7002)
Crankpin metal thickness, mm (in) .......... 1,487-1,500 (0,0588-0,0593)
Crankpin outside diameter, mm (in) .......... 39,970-39,980 (1,5798-1,5802)
Oil clearance, mm (in) .......... 0,033-0,059 (0,0013-0,0023)
Piston pin bushing inside diameter, mm (in) .......... 21,025-21,038 (0,8310-0,8315)
Piston pin outside diameter, mm (in) .......... 20,991-21,000 (0,8297-0,8300)
Oil clearance, mm (in) .......... 0,025-0,047 (0,0010-0,0019)

Yanmar 3TNE74 Tightening Torque Specs

Cylinder head bolt (M9x1,25), Nm (lb-ft) ........ 59-64 (43-47)
Connecting rod bolt (M7x1,0), Nm (lb-ft) ........ 23-28 (17-20)
Flywheel clamping bolt (M10x1,25), Nm (lb-ft) ........ 78-88 (58-65)
Metal cap clamping bolt (M10x1,25), Nm (lb-ft) ........ 78-83 (58-61)
Crankshaft V-pulley clamping bolt (M12x1,5), Nm (lb-ft) ........ 113-123 (83-90)
Fuel injection nozzle nut (M20x1,5), Nm (lb-ft) ........ 49-53 (36-39)
Glow plug (M10x1,25), Nm (lb-ft) ........ 15-20 (11-15)
Stub shaft bolt (M10x1,5), Nm (lb-ft) ........ 54-64 (40-47)
Governor weight support nut (M12x1,25), Nm (lb-ft) ........ 69-74 (51-54)
High pressure pipe sleeve clamping nut (M12x1,5), Nm (lb-ft) ........ 29-34 (22-25)

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