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Kubota V3800 Engine

General Technical Data

Kubota V3800 Engine Specifications

Engine Model .............. Kubota V3800
Engine Type .............. 4-Stroke, vertical, water-cooled diesel
Number of Cylinders .............. 4
Total displacement, cc (cu.in) .............. 3769 (230.0)
Engine Bore, mm (in) .............. 100.0 (3.94)
Engine Stroke, mm (in) .............. 120.0 (4.72)
Rated Engine Power, hp (kW) .............. 99.2 (74.0)
Rated Engine Speed, rpm .............. 2600
Maximum Engine Speed, rpm .............. 2800
Idle Speed, rpm .............. 775-825
Compression Ratio .............. 19:1
Firing Order .............. 1-3-4-2
Lubrication System .............. Forced lubrication by trochoid pump
Oil Filter Type .............. Full Flow Paper

Fuel System

Fuel System Type .............. Direct injection
Fuel Injection Pump .............. Bosch Type Mini
Injection Nozzle .............. Bosch throttle type
Governor Type .............. All speed mechanical governor
Injection Pressure, MPa (psi) .............. 18.63 (2702) 1-stage, 23.54 (3414) 2-stage
Injection Timing, rad (deg) .............. 0.10 (6.0) before T.D.C.

Electrical System

Electrical System Rating, Volts .............. 12
Starter Type .............. Electric
Starting Motor .............. 12V, 3.0kW
Charging Alternator .............. 12V, 540W
Battery Rating .............. 12V, 136AH

Dimensions

Length, mm (in) .............. 745 (29.3)
Width, mm (in) .............. 549 (21.6)
Height, mm (in) .............. 794 (31.3)
Dry Weight, kg (lbs) .............. 288 (635)

Kubota V3800 Maintenance Data

Cylinder Block and Valves

Cylinder Bore I.D. (Maximum), mm (in) .............. 100.65 (3.9626)
Cylinder Head (Maximum Out of Flatness), mm (in) .............. 0.05 (0.002)
Intake Valve Clearance, mm (in) .............. 0.23-0.27 (0.0091-0.010)
Exhaust Valve Clearance, mm (in) .............. 0.23-0.27 (0.0091-0.010)

Engine Oil and Filter

Engine Oil Type .............. SAE20, SAE30, 10W-30
Oil Classification .............. API CF-4, CG-4, CH-4 or CI-4
Oil Capacity, L (qts) .............. 13.2 (14.0)
Oil Filter Part Number .............. HH1C0-32430

Service Intervals

Service Air Cleaner Element .............. Every 250 hours
Service Fuel Filter (Element Type) .............. Every 250 hours
Change Engine Oil .............. Every 500 hours
Change Oil Filter Cartridge .............. Every 500 hours
Replace Fuel Filter Cartridge .............. Every 500 hours
Replace Fan Belt .............. Every 500 hours
Check and Adjust Valve Clearance .............. Every 1000 hours
Replace Air Cleaner Element .............. Every 1500 hours
Check Fuel Injection Pump .............. Every 3000 hours

Kubota V3800 Service Specifications

Cylinder Block

Compression Pressure .............. 3.47 MPa (504 psi)
Cylinder Bore I.D (Standard) .............. 100.000-100.022 mm (3.93701-3.93787 in.)
Cylinder Bore I.D (Wear Limit) .............. 100.150 mm (3.9429 in.)
Cylinder Bore Oversize I.D (Standard) .............. 100.500-100.522 mm (3.95670-3.95755 in.)
Cylinder Bore Oversize I.D (Wear Limit) .............. 100.650 mm (3.96260 in.)
Rocker Arm Shaft to Rocker Arm Clearance .............. 0.016-0.045 mm (0.00063-0.0017 in.)
Rocker Arm Shaft O.D .............. 15.973-15.984 mm (0.62886-0.62929 in.)
Rocker Arm I.D .............. 16.000-16.018 mm (0.62993-0.63062 in.)
Tappet to Tappet Guide Clearance .............. 0.020-0.062 mm (0.00079-0.0024 in.)
Tappet O.D .............. 23.959-23.980 mm (0.94327-0.94409 in.)
Tappet Guide Bore I.D .............. 24.000-24.021 mm (0.94489-0.94570 in.)
Connecting Rod Alignment .............. 0.05 mm (0.002 in.)

Cylinder Head and Valves

Cylinder Head Surface Flatness .............. 0.05 mm (0.002 in.)
Valve Clearance (Cold) .............. 0.23-0.27 mm (0.0091-0.010 in.)
Top Clearance .............. 0.701-0.930 mm (0.0276-0.0366 in.)
Intake Valve Recessing .............. 0.60-0.80 mm (0.024-0.031 in.)
Exhaust Valve Recessing .............. 0.850-1.05 mm (0.0335-0.0413 in.)
Valve Stem to Valve Guide Clearance .............. 0.055-0.085 mm (0.0022-0.0033 in.)
Valve Stem O.D .............. 6.960-6.975 mm (0.2741-0.2746 in.)
Valve Guide I.D .............. 7.030-7.045 mm (0.2768-0.2773 in.)
Intake Valve Face Angle .............. 1.0 rad (60 deg)
Exhaust Valve Face Angle .............. 0.79 rad (45 deg)
Intake Valve Seat Angle .............. 1.0 rad (60 deg)
Exhaust Valve Seat Angle .............. 0.79 rad (45 deg)
Intake Valve Seat Width .............. 1.6-2.0 mm (0.063-0.078 in.)
Exhaust Valve Seat Width .............. 2.3-2.6 mm (0.091-0.10 in.)
Intake Valve Timing (Open) .............. 0.24 rad (14 deg) before T.D.C.
Intake Valve Timing (Close) .............. 0.63 rad (36 deg) after B.D.C.
Exhaust Valve Timing (Open) .............. 0.79 rad (45 deg) before B.D.C.
Exhaust Valve Timing (Close) .............. 0.30 rad (17 deg) after T.D.C.
Valve Spring Free Length .............. 35.1-35.6 mm (1.39-1.40 in.)

Piston and Piston Rings

Piston Pin Bore I.D (Standard) .............. 30.000-30.013 mm (1.1811-1.1816 in.)
Piston Pin Bore I.D (Wear Limit) .............. 30.05 mm (1.183 in.)
Piston Pin to Small End Bushing Clearance .............. 0.020-0.040 mm (0.00079-0.0015 in.)
Piston Pin O.D .............. 30.006-30.011 mm (1.1814-1.1815 in.)
Small End Bushing I.D .............. 30.031-30.046 mm (1.1824-1.1829 in.)
Top Ring Gap .............. 0.30-0.45 mm (0.012-0.017 in.)
Second Ring Gap .............. 0.30-0.45 mm (0.012-0.017 in.)
Oil Ring Gap .............. 0.25-0.45 mm (0.0099-0.017 in.)
Second Ring Groove Clearance .............. 0.0930-0.120 mm (0.00367-0.00472 in.)
Oil Ring Groove Clearance 0.020-0.060 mm (0.00079-0.0023 in.)

Crankshaft

Crankshaft Side Clearance .............. 0.15-0.31 mm (0.0059-0.012 in.)
Crankshaft Alignment .............. 0.02 mm (0.0008 in.)
Crank Pin to Crank Pin Bearing Clearance .............. 0.018-0.062 mm (0.00071-0.0024 in.)
Crank Pin O.D .............. 52.977 to 52.990 mm (2.0857-2.0862 in.)
Crankshaft Journal to Crankshaft Bearing Clearance .............. 0.018-0.062 mm (0.00071-0.0024 in.)
Crankshaft Journal O.D .............. 74.977-74.990 mm (2.9519-2.9523 in.)

Camshaft

Camshaft Side Clearance .............. 0.070-0.22 mm (0.0028-0.0086 in.)
Camshaf Alignment .............. 0.01 mm (0.0004 in.)
Cam Height (Intake) .............. 37.63-37.13 mm (1.481-1.462 in.)
Cam Height (Exhaust) .............. 38.96-38.46 mm (1.534-1.514 in.)
Camshaft Oil Clearance .............. 0.050-0.091 mm (0.0020-0.0035 in.)
Camshaft Journal O.D .............. 45.934-45.950 mm (1.8085-1.8090 in.)
Camshaft Bearing I.D .............. 46.000-46.025 mm (1.8111-1.8120 in.)

Kubota V3800 Tightening Torque Specs

Cylinder head cover screw, Nm (lb-ft) .............. 6.9-11.2 (5.1-8.31)
Cylinder head screw (M12x1.25), Nm (lb-ft) .............. 98.1-107 (72.4-79.5)
Connecting rod screw (M10x1.25), Nm (lb-ft) .............. 79-83 (58-61)
Flywheel screw (M12x1.25), Nm (lb-ft) .............. 98.1-107 (72.4-79.5)
Crankshaft screw (M16x1.5), Nm (lb-ft) .............. 255-274 (188-202)
Main bearing case screw (M14x1.5), Nm (lb-ft) .............. 138-147 (102-108)
Rocker arm bracket screw (M10x1.25), Nm (lb-ft) .............. 49-55 (37-41)
Nozzle holder clamp nut .............. (M8x1.25), Nm (lb-ft) .............. 18-20 (13-15)
Injection pipe retaining nut (M12x1.5), Nm (lb-ft) .............. 23-36 (17-26)
Oil pump cover screw, Nm (lb-ft) .............. 7.9-9.3 (5.8-6.8)
Injection pump unit mounting nut (M8x1.25), Nm (lb-ft) .............. 18-20 (13-15)
Camshaft set screw (M8x1.25), Nm (lb-ft) .............. 24-27 (18-20)
Flywheel housing mounting screw (M12x1.25), Nm (lb-ft) .............. 78-90 (58-66)
Crankcase mounting screw (M10x1.25), Nm (lb-ft) .............. 49-55 (37-41)
Injection pump mounting screw (M8x1.25), Nm (lb-ft) .............. 24-27 (18-20)
Governor housing mounting screw (M6x1.0), Nm (lb-ft) .............. 9.8-11.2 (7.24-8.31)

KUBOTA TRACTORS TROUBLESHOOTING
L235	L2501	L2550	L275	L3110
L3301	L35	L3710	L3901	L4310
L5030	M4700	M5700	M6040	M6800
M8200	M8540	M9000	MX5100	MX5200