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Yanmar 4TNV98T Engine

General Technical Data

Yanmar 4TNV98T Engine Specs

Engine Model ................ Yanmar 4TNV98T
Engine Type ................ 4-cycle vertical in-line turbocharged diesel
Number of Cylinders ................ 4
Total 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 Engine Power, hp (kW) ................ 83.8 (62.5)
Rated Engine Speed, rpm ................ 2500
High Idle Speed, rpm ................ 2725±25
Aspiration Type ................ Turbocharged
Firing Order ................ 1-3-4-2
Direction of Rotation ................ Counterclockwise (Flywheel Side)
Combustion System ................ Ball type swirl chamber
Air Cleaner Type ................ Dry, dual element
Lubricating System ................ Forced with trochoid pump
Oil Filter Type ................ Full flow
Cooling System ................ Liquid-cooled with radiator
Electrical System Rating, Volts ................ 12
Charging System ................ Alternator
Alternator Rating, Amps ................ 40

Fuel System

Fuel System ................ Direct injection
Fuel Injection Pump ................ Mechanical
Fuel Filter Type ................ Replaceable element
Fuel Injection Pressure, psi (kPa) ................ 2843-2988 (19600-20600)
Fuel Injection Timing, deg ................ 18, BTDC

Dimensions and Weight

Overall Width, in (mm) ................ 22.6 (575)
Overall Height, in (mm) ................ 29.2 (742)
Overall Length, in (mm) ................ 31.7 (805)
Dry Weight, lbs (kg) ................ 540 (245)

Yanmar 4TNV98T Maintenance

Service Data

Cylinder Bore I.D, in (mm) ................ 3.8583-3.8594 (98.000-98.030)
Cylinder head (max out of flatness), in (mm) ................ 0.05 (0.002)
Intake valve clearance (Cold), in (mm) ................ 0.006-0.010 (0.15-0.25)
Exhaust valve clearance (Cold), in (mm) ................ 0.006-0.010 (0.15-0.25)
Cylinder compression, psi (kPa) ................ 384-513 (2650-3540)
Engine oil pressure (rated speed), psi (kPa) ................ 57-71 (390-490)
Engine oil pressure (low idle speed), psi (kPa) ................ 8.8 (60)
Fuel injection pressure, psi (kPa) ................ 2843-2988 (19600-20600)
Fuel injection timing, deg ................ 18, BTDC
Fan belt tension, N (lbf) ................ 98 (22)
Fan belt deflection, in (mm) ................ 0.35-0.55 (9.0-14.0)

Engine Oil and Filters

Engine oil type ................ SAE 10W-30, 15W-40, 20W-50
API service classification ................ CD or higher
Engine oil capacity, qts (L) ................ 11.1 (10.5)
Oil filter part number ................ 129150-35152
Air filter part number ................ 129944-12500
Fuel filter part number ................ 119802-55710

Yanmar 4TNV98T Service Specifications

Cylinder Block

Cylinder Bore I.D (Standard), in (mm) ................ 3.8583-3.8594 (98.000-98.030)
Cylinder Bore I.D (Wear Limit), in (mm) ................ 3.8634 (98.130)
Crankshaft Bearing Journal O.D, in (mm) ................ 2.5572-2.5576 (64.952-64.962)
Crankshaft Bearing I.D, in (mm) ................ 2.5590-2.5598 (65.000-65.020)
Crankshaft Bearing Oil Clearance, in (mm) ................ 0.0015-0.0027 (0.038-0.068)
Crankshaft End Play, in (mm) ................ 0.0051-0.0091 (0.13-0.23)
Connecting Rod Journal O.D, in (mm) ................ 2.2816-2.2820 (57.952-57.962)
Connecting Rod Bearing I.D, in (mm) ................ 2.2835-2.2845 (58.000-58.026)
Connecting Rod Oil Clearance, in (mm) ................ 0.0015-0.0029 (0.038-0.074)
Connecting Rod Small End Bushing I.D (Standard), in (mm) ................ 1.1821-1.1826 (30.025-30.038)
Connecting Rod Small End Bushing I.D (Wear Limit), in (mm) ................ 1.1838 (30.068)
Connecting Rod Small End O.D (Standard), in (mm) ................ 1.1806-1.1811 (29.987-30.000)
Connecting Rod Small End O.D (Wear Limit), in (mm) ................ 1.1795 (29.959)
Connecting Rod Small End Oil Clearance, in (mm) ................ 0.0010-0.0020 (0.025-0.051)
Connecting Rod Big End Side Clearance, in (mm) ................ 0.0079-0.0157 (0.20-0.40)

Cylinder Head and Valves

Cylinder Head Surface (Flatness, Standard), in (mm) ................ 0.0020 (0.05)
Cylinder Head Surface (Flatness, Wear Limit), in (mm) ................ 0.0059 (0.15)
Intake Valve Recession (Standard), in (mm) ................ 0.0142-0.0220 (0.36-0.56)
Intake Valve Recession (Wear Limit), in (mm) ................ 0.0315 (0.80)
Exhaust Valve Recession (Standard), in (mm) ................ 0.0138-0.0217 (0.35-0.55)
Exhaust Valve Recession (Wear Limit), in (mm) ................ 0.0315 (0.80)
Intake Valve Seat Angle, deg ................ 120
Exhaust Valve Seat Angle, deg ................ 90
Intake Valve Guide I.D, in (mm) ................ 0.2756-0.2762 (7.000-7.015)
Intake Valve Stem O.D, in (mm) ................ 0.2734-0.2740 (6.945-6.960)
Exhaust Valve Guide I.D, in (mm) ................ 0.2756-0.2762 (7.000-7.015)
Exhaust Valve Stem O.D, in (mm) ................ 0.2732-0.2738 (6.940-6.955)
Valve Spring Free Length (Standard), in (mm) ................ 1.5630 (39.70)
Valve Spring Free Length (Wear Limit), in (mm) ................ 1.5433 (39.20)
Camshaft End Play, in (mm) ................ 0.0020-0.0079 (0.05-0.20)
Cam Lobe Height, in (mm) ................ 1.7087-1.7165 (43.400-43.600)
Camshaft Bushing I.D (Gear End), in (mm) ................ 1.9681-1.9707 (49.990-50.055)
Camshaft O.D (Gear End), in (mm) ................ 1.9655-1.9665 (49.925-49.950)
Camshaft Oil Clearance (Gear End), in (mm) ................ 0.0016-0.0051 (0.040-0.130)
Camshaft Bushing I.D (Intermediate), in (mm) ................ 1.9685-1.9695 (50.000-50.025)
Camshaft O.D (Intermediate), in (mm) ................ 1.9650-1.9659 (49.910-49.935)
Camshaft Oil Clearance (Intermediate), in (mm) ................ 0.0026-0.0045 (0.065-0.115)
Camshaft Bushing I.D (Flywheel End), in (mm) ................ 1.9685-1.9695 (50.000-50.025)
Camshaft O.D (Flywheel End), in (mm) ................ 1.9655-1.9665 (49.925-49.950)
Camshaft Oil Clearance (Flywheel End), in (mm) ................ 0.0020-0.0039 (0.050-0.100)
Rocker Arm Shaft Bore I.D (Standard), in (mm) ................ 0.7283-0.7291 (18.500-18.520)
Rocker Arm Shaft Bore I.D (Wear Limit), in (mm) ................ 0.7311 (18.57)
Rocker Arm Shaft O.D (Standard), in (mm) ................ 0.7272-0.7280 (18.470-18.490)
Rocker Arm Shaft O.D (Wear Limit), in (mm) ................ 0.7260 (18.44)
Rocker Arm Oil Clearance (Standard), in (mm) ................ 0.0004-0.0020 (0.010-0.050)
Rocker Arm Oil Clearance (Wear Limit), in (mm) ................ 0.0051 (0.13)

Idler Gear and Timing Gear

Idler Gear Shaft O.D (Standard), in (mm) ................ 1.8091-1.8100 (45.950-45.975)
Idler Gear Shaft O.D (Wear Limit), in (mm) ................ 1.8071 (45.900)
Idler Gear Bushing I.D (Standard), in (mm) ................ 1.8110-4.8120 (46.000-46.025)
Idler Gear Bushing I.D (Wear Limit), in (mm) ................ 1.8140 (46.075)
Idler Gear Oil Clearance (Standard), in (mm) ................ 0.0010-0.0030 (0.025-0.075)
Idler Gear Oil Clearance (Wear Limit), in (mm) ................ 0.0069 (0.175)
Timing Gear Backlash (Standard), in (mm) ................ 0.0031-0.0055 (0.08-0.14)
Timing Gear Backlash (Wear Limit), in (mm) ................ 0.0063 (0.16)

Pistons and Piston Rings

Piston O.D (Standard), in (mm) ................ 3.8555-3.8567 (97.930-97.960)
Piston O.D (Wear Limit), in (mm) ................ 3.8541 (97.895)
Piston Pin Bore I.D (Standard), in (mm) ................ 1.1811-1.1815 (30.000-30.009)
Piston Pin Bore I.D (Wear Limit), in (mm) ................ 1.1826 (30.039)
Piston Pin O.D (Standard), in (mm) ................ 1.1807-1.1811 (29.989-30.000)
Piston Pin O.D (Wear Limit), in (mm) ................ 1.1795 (29.959)
Piston Pin Oil Clearance, in (mm) ................ 0.0000-0.0008 (0.000-0.020)
Top Ring Groove Width, in (mm) ................ 0.0803-0.0811 (2.040-2.060)
Top Ring Width, in (mm) ................ 0.0764-0.0772 (1.940-1.960)
Top Ring Groove Clearance, in (mm) ................ 0.0031-0.0047 (0.080-0.120)
Top Ring End Gap, in (mm) ................ 0.0098-0.0177 (0.250-0.450)
Second Ring Groove Width, in (mm) ................ 0.0819-0.0825 (2.080-2.095)
Second Ring Width, in (mm) ................ 0.0776-0.0783 (1.970-1.990)
Second Ring Groove Clearance, in (mm) ................ 0.0035-0.0049 (0.090-0.125)
Second Ring End Gap, in (mm) ................ 0.0177-0.0256 (0.450-0.650)
Oil Ring Groove Width, in (mm) ................ 0.1187-0.1193 (3.015-3.030)
Oil Ring Width, in (mm) ................ 0.1169-0.1177 (2.970-2.990)
Oil Ring Groove Clearance, in (mm) ................ 0.0010-0.0024 (0.025-0.060)
Oil Ring End Gap, in (mm) ................ 0.0098-0.0177 (0.250-0.450)

Tightening Torques

Cylinder Head Bolt (M11x1.25), ft-lb (Nm) ................ 76-83 (103.1-112.9)
Connecting Rod Bolt (M10x1.0), ft-lb (Nm) ................ 40-43 (53.9 -58.8)
Flywheel Bolt (M14x1.5), ft-lb (Nm) ................ 137-152 (186.2 -205.8)
Main Bearing Cap Bolt (M11x1.25), ft-lb (Nm) ................ 80-87 (108.1-117.9)
Crankshaft Pulley Bolt (M14x1.5), ft-lb (Nm) ................ 80-94 (107.9-127.5)
Oil Pump Cover Screw ................ 4.8-6.3 ft-lb (6.5-8.5 Nm)
Oil Drain Plug ................ 14-17 ft-lb (19.6-23.5 Nm)
Fuel Injector Bolt (M8x1.25), ft-lb (Nm) ................ 18-21 (24.4-28.4)
Fuel Pump Drive Gear Nut (M18x1.5), ft-lb (Nm) ................ 83-90 (113-123)
High-Pressure Fuel Lines Bolt (M12x1.5), ft-lb (Nm) ................ 22-25 (29.4-34.3)
Fuel Return Line Bolts, ft-lb (Nm) ................ 6-8 (7.8-9.8)
Fuel Injection Pump Mounting Nuts, ft-lb (Nm) ................ 17-21 (23-28)
Fuel Injector Nozzle Case Nut, ft-lb (Nm) ................ 30-33 (39.2-44.1)