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Yanmar 4TNE84 Specifications

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• Yanmar 4TNE84 Engine Specifications
• Yanmar 4TNE84 Engine Troubleshooting

Engine Model .......... Yanmar 4TNE84
Engine Type .......... Vertical four-stroke water-cooled diesel
Number of Cylinders .......... 4
Engine Bore, in (mm) .......... 3.32 (84.0)
Engine Stroke, in (mm) .......... 3.56 (90.0)
Displacement, cu.in (L) .......... 121.7 (1.995)
Engine Power, hp (kW) .......... 40.4 (30.1)
Engine Speed, rpm .......... 3000
Maximum Torque, Nm (lb-ft) .......... 126.8 (93.5)
Fast Idle Speed, rpm .......... 2875
Slow Idle Speed, rpm .......... 950
Firing Order .......... 1-3-4-2
Compression Ratio .......... 18:1
Direction of Rotation .......... Counterclockwise (viewed from flywheel)
Combustion System .......... Special swirl pre-combustion chamber
Air Cleaner Type .......... Dry Type with Safety Element
Lubrication System .......... Forced lubrication with trochoid pump
Oil Filter Type .......... Single Element
Cooling System Type .......... Liquid cooling with radiator
Cooling Fan Type .......... Pusher
Starting system .......... Electric Starter
Electrical System Rating, Volts .......... 12
Charging System .......... Alternator
Alternator Rating, Amp .......... 20

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

Overall Width, in (mm) .......... 19.7 (499)
Overall Height, in (mm) .......... 24.4 (618)
Overall Depth, in (mm) .......... 26.0 (658)
Dry Weight, lbs (kg) .......... 375 (170)

Cylinder bore inside diameter (Std), mm (in) .......... 84.00-84.03 (3.3202-3.3213)
Cylinder bore inside diameter (Wear limit), mm (in) .......... 84.20 (3.3281)
Clearance between piston and cylinder, mm (in) .......... 0.04-0.07 (0.0016-0.0028)
Crankshaft journal outside diameter, mm (in) .......... 53.952-53.962 (2.1325-2.1329)
Bearing metal thickness, mm (in) .......... 1.995-2.000 (0.0789-0.0791)
Crank journal and bushing 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 (2.0158-2.0162)
Crankpin metal thickness, mm (in) .......... 1.492-1.500 (0.0590-0.0593)
Crankpin outside diameter, mm (in) .......... 47.952-47.962 (1.8953-1.8957)
Crankpin to bushing clearance, mm (in) .......... 0.038-0.074 (0.0015-0.0029)

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) .......... 1.07-1.24 (0.0423-0.0490)
Exhaust valve seat width, mm (in) .......... 1.24-1.45 (0.0490-0.0573)
Intake valve stem outside diameter, mm (in) .......... 7.96-8.03 (0.3144-0.3172)
Intake valve guide inside diameter, mm (in) .......... 8.01-7.98 (0.3166-0.3152)
Intake valve stem to guide clearance, mm (in) .......... 0.04-0.07 (0.0014-0.0028)
Exhaust valve stem outside diameter, mm (in) .......... 7.96-8.03 (0.3144-0.3174)
Exhaust valve guide inside diameter, mm (in) .......... 8.02-7.97 (0.3168-0.3150)
Exhaust valve stem to guide clearance, mm (in) .......... 0.05-0.08 (0.0018-0.0030)
Valve guide projection, mm (in) .......... 15.00 (0.5929)
Intake valve sinking depth, mm (in) .......... 0.31-0.51 (0.0121-0.0200)
Exhaust valve sinking depth, mm (in) .......... 0.30-0.50 (0.0119-0.0198)
Thickness of intake valve head, mm (in) .......... 1.24-1.44 (0.0492-0.0571)
Thickness of exhaust valve head, mm (in) .......... 1.35-1.55 (0.0534-0.0613)
Intake valve timing (Open), degrees .......... 10-20
Intake valve timing (Close), degrees .......... 40-50
Exhaust valve timing (Open), degrees .......... 51-61
Exhaust valve timing (Close), degrees .......... 13-23
Valve spring free length, mm (in) .......... 42.00 (1.6601)
Rocker arm shaft outside diameter, mm (in) .......... 15.97-15.98 (0.6311-0.6318)
Rocker arm bushing inside diameter, mm (in) .......... 16.00-16.02 (0.6324-0.6332)
Rocker arm to bushing clearance, mm (in) .......... 0.02-0.05 (0.0006-0.0021)
Camshaft journal outside diameter (Gear), mm (in) .......... 44.925-44.950 (1.7757-1.7767)
Camshaft oil clearance (Gear), mm (in) .......... 0.040-0.130 (0.0016-0.0051)
Camshaft journal outside diameter (Center), mm (in) .......... 44.910-44.935 (1.7751-1.7761)
Camshaft oil clearance (Center), mm (in) .......... 0.065-0.115 (0.0026-0.0045)
Camshaft journal outside diameter (Flywheel), mm (in) .......... 44.925-44.950 (1.7757-1.7767)
Camshaft oil clearance (Flywheel), mm (in) .......... 0.050-0.100 (0.0020-0.0040)

Piston outside diameter (Std), mm (in) .......... 83.945-83.975 (3.3180-3.3192)
Piston outside diameter (Wear limit), mm (in) .......... 83.90 (3.3162)
Piston pin outside diameter, mm (in) .......... 25.987-26.000 (1.0272-1.0277)
Piston pin bore diameter, mm (in) .......... 26.00-26.009 (1.0277-1.0280)
Piston pin to piston pin bore clearance, mm (in) .......... 0.00-0.022 (0.0000-0.0009)
Piston pin bushing inside diameter, mm (in) .......... 26.025-26.038 (1.0287-1.0292)
Piston pin outside diameter, mm (in) .......... 25.987-26.000 (1.0272-1.0277)
Piston pin to bushing clearance, mm (in) .......... 0.025-0.051 (0.0010-0.0020)
Top ring groove width, mm (in) .......... 2.065-2.080 (0.0816-0.0822)
Top ring width, mm (in) .......... 1.970-1.990 (0.0779-0.0787)
Top ring side clearance, mm (in) .......... 0.075-0.110 (0.0030-0.0043)
Top ring end gap, mm (in) .......... 0.200-0.400 (0.0079-0.0158)
Second ring groove width, mm (in) .......... 2.035-2.050 (0.0804-0.0810)
Second ring width, mm (in) .......... 1.970-1.990 (0.0779-0.0787)
Second ring side clearance, mm (in) .......... 0.045-0.080 (0.0018-0.0032)
Second ring end gap, mm (in) .......... 0.200-0.400 (0.0079-0.0158)
Oil ring groove width, mm (in) .......... 4.015-4.030 (0.1587-0.1593)
Oil ring width, mm (in) .......... 3.970-3.990 (0.1569-0.1577)
Oil ring side clearance, mm (in) .......... 0.025-0.060 (0.0010-0.0024)
Oil ring end gap, mm (in) .......... 0.200-0.450 (0.0079-0.0178)

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)
Compression pressure, MPa .......... 3.24±0.1
Fuel injection timing (FlD, BTDC) deg .......... 16±1
Fuel injection pressure, MPa .......... 19.6
Engine oil type .......... SAE 15W-40/5W-30
Engine oil capacity, qt (L) .......... 5.6 (5.3)
Coolant capacity, qt (L) .......... 6.1 (5.8)
Oil filter change interval .......... Every 200 hours
Oil change interval .......... Every 200 hours
Fuel filter change interval .......... Every 500 hours

Cylinder head bolt (M10x1.25), Nm (lb-ft) .......... 85-91 (63-67)
Connecting rod bolt (M9x1.0), Nm (lb-ft) .......... 47-54 (35-40)
Flywheel clamping bolt (M10x1.25), Nm (lb-ft) .......... 83-88 (61-65)
Metal cap clamping bolt (M12x1.5), Nm (lb-ft) .......... 96-100 (71-74)
Crankshaft V-pulley clamping bolt (M14x1.5), Nm (lb-ft) .......... 113-123 (83-90)
Fuel injection nozzle nut (M6x1.0), Nm (lb-ft) .......... 7-9 (5-7)
Timer clamping nut (M12x1.75), Nm (lb-ft) .......... 59-69 (43-51)
Governor weight support nut (M12x1.25), Nm (lb-ft) .......... 44-49 (33-36)
High pressure pipe sleeve clamping nut (M12x1.5), Nm (lb-ft) .......... 29-34 (22-25)

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