Kubota EA330-E4 Series Workshop Manual
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Kubota EA330-E4 Series Workshop Manual

Kubota EA330-E4 Series Workshop Manual

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WORKSHOP MANUAL
DIESEL ENGINE
EA330-E4 SERIES
KiSC issued 05, 2015 A

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  • Page 1 WORKSHOP MANUAL DIESEL ENGINE EA330-E4 SERIES KiSC issued 05, 2015 A...
  • Page 2 All illustrations, photographs and specifications contained in this manual are of the newest information available at the time of publication. KUBOTA reserves the right to change all information at any time without notice. Since this manual includes many models, information or illustrations and photographs can show more than one model.
  • Page 3 Record of Revisions For pdf, use search function {Search word} to find all the revised locations. Last digit Issue Reference of the Main Revised Point and Corrective Measures {Search word} month Page Code No. 2015.05 Change the Adjusting Injection Timing to Replacing Injection pump. 1-S19 KiSC issued 05, 2015 A...
  • Page 4 INFORMATION KiSC issued 05, 2015 A...
  • Page 5 INFORMATION CONTENTS 1. SAFETY FIRST ..........................I-1 2. SPECIFICATIONS.......................... I-4 3. PERFORMANCE CURVES......................I-5 4. DIMENSIONS ..........................I-6 KiSC issued 05, 2015 A...

  • Page 6: Safety First

    INFORMATION EA330-E4, WSM 1. SAFETY FIRST SAFETY FIRST • This symbol, the industry's "Safety Alert Symbol", is used throughout this manual and on labels on the machine itself to warn of the possibility of personal injury. Read these instructions carefully. •...
  • Page 7 INFORMATION EA330-E4, WSM OPERATE SAFELY • Do not use the machine after you consume alcohol or medication or when you are tired. • Put on applicable clothing and safety equipment. • Use applicable tools only. Do not use alternative tools or parts. •...
  • Page 8 INFORMATION EA330-E4, WSM KEEP A GOOD AIRFLOW IN THE WORK AREA • If the engine is in operation, make sure that the area has good airflow. Do not operate the engine in a closed area. The exhaust gas contains poisonous carbon monoxide.

  • Page 9: Specifications

    INFORMATION EA330-E4, WSM 2. SPECIFICATIONS Model EA330-E4-NB1 EA330-E4-NB1-APU-1 EA330-E4-NB1-SCS-1 Number of Cylinder Engine Type Horizontal, water-cooled, 4-cycle diesel engine Bore × Stroke 77.0 mm × 70.0 mm (3.03 in × 2.76 in.) Displacement 325 cc (19.8 cu.in.) 5.76 kW (7.72 HP) / SAE Intermittent 5.15 kW (6.91 HP) / 3000 min (rpm)

  • Page 10: Performance Curves

    INFORMATION EA330-E4, WSM 3. PERFORMANCE CURVES (1) Intermittent Torque (2) Brake Horse Power (3) Fuel Consumption (4) Brake Horse Power (Intermittent) (Continuous) NOTE • Each performance curves obtained in accordance with SAE J816b are corrected to 760 mm Hg (29.9 in.Hg), 20 °C (68 °F) 60 % humidity. 9Y1211018INI0002US0 KiSC issued 05, 2015 A...

  • Page 11: Dimensions

    INFORMATION EA330-E4, WSM 4. DIMENSIONS EA330-E4-NB1 311.5 mm (12.26 in.) 138 mm (5.43 in.) 173.5 mm (6.831 in.) 326 mm dia. (12.8 in. dia.) 64 mm (2.5 in.) 46 mm (1.8 in.) 567.7 mm (22.35 in.) 335 mm (13.2 in.) 232.7 mm (9.161 in.) 457 mm (18.0 in.) 326 mm (12.8 in.)
  • Page 12 INFORMATION EA330-E4, WSM EA330-E4-NB1-APU-1 303.5 mm (11.95 in.) 130 mm (5.12 in.) 173.5 mm (6.831 in.) 64 mm (2.5 in.) 46 mm (1.8 in.) 485 mm (19.1 in.) 317 mm (12.5 in.) 168 mm (6.61 in.) 400 mm (15.7 in.) 304 mm (12.0 in.) 125 mm (4.92 in.) 429 mm (16.9 in.)
  • Page 13 INFORMATION EA330-E4, WSM EA330-E4-NB1-SCS-1 303.5 mm (11.95 in.) 130 mm (5.12 in.) 173.5 mm (6.831 in.) 64 mm (2.5 in.) 46 mm (1.8 in.) 485 mm (19.1 in.) 317 mm (12.5 in.) 168 mm (6.61 in.) 221 mm (8.70 in.) 216.8 mm (8.535 in.) 125 mm (4.92 in.) 341.8 mm (13.46 in.)
  • Page 14 INFORMATION EA330-E4, WSM Pulley Shaft (EA330-E4-NB1, EA330-E4-NB1-APU-1, EA330-E4-NB1-SCS-1) 19501-8451-0 9.525 to 9.575 mm (0.3750 to 0.3769 in.) 36.487 to 36.512 mm dia. (1.4365 to 1.4374 in. dia.) 88.9 mm (3.50 in.) 66.60 to 66.90 mm (2.622 to 2.633 in.) 3 Through holes-9.0 mm dia. (0.35 in. dia.) 128.9 mm (5.075 in.) 116 mm dia.
  • Page 15 GENERAL KiSC issued 05, 2015 A...

  • Page 16: Table Of Contents

    GENERAL CONTENTS 1. ENGINE IDENTIFICATION ......................G-1 [1] MODEL NAME AND ENGINE SERIAL NUMBER..............G-1 [2] E4 ENGINE ..........................G-3 2. GENERAL PRECAUTIONS......................G-4 3. MAINTENANCE CHECK LIST ..................... G-5 4. CHECK AND MAINTENANCE ..................... G-7 [1] DAILY CHECK LIST ....................... G-7 [2] CHECK POINT OF EVERY 50 HOURS .................

  • Page 17: Engine Identification

    GENERAL EA330-E4, WSM 1. ENGINE IDENTIFICATION [1] MODEL NAME AND ENGINE SERIAL NUMBER When contacting the manufacture, always specify your engine model name and serial number. The engine model and its serial number need to be identified before the engine can be serviced or parts replaced. ...
  • Page 18 GENERAL EA330-E4, WSM (Continued) Production Month and Lot Number Month Engine Lot Number January A0001 ~ A9999 B0001 ~ February C0001 ~ C9999 D0001 ~ March E0001 ~ E9999 F0001 ~ April G0001 ~ G9999 H0001 ~ J0001 ~ J9999 K0001 ~ June L0001 ~ L9999...

  • Page 19: E4 Engine

    Over the past several years, KUBOTA has been supplying diesel engines that comply with regulations in the respective countries affected by Nonroad Emission regulations. For KUBOTA Engines, E4 will be the designation that identifies engine models affected by the next emission phase (See the table below).

  • Page 20: General Precautions

    • When it is necessary to use special tools, use KUBOTA special tools. Refer to the drawings when you make special tools that you do not use frequently.

  • Page 21: Maintenance Check List

    • When the battery is used for less than 100 hours in a year, check its electrolyte yearly. (for refillable battery's only.) • The items listed above (@ marked) are registered as emission related critical parts by KUBOTA in the U.S.EPA nonroad emission regulation.
  • Page 22 JUN87) • Since KUBOTA diesel engines of less than 56 kW (75 hp) utilize EPA Tier 4 and Interim Tier 4 standards, the use of low sulfur fuel or ultra low sulfur fuel is mandatory for these engines, when operated in US EPA regulated areas.

  • Page 23: Check And Maintenance

    GENERAL EA330-E4, WSM 4. CHECK AND MAINTENANCE [1] DAILY CHECK LIST Checking Coolant Level (Daily) CAUTION • During operation or immediately after operation, coolant in the radiator is extremely hot. If the radiator cap is removed, hot water may gush out, causing scalding.

  • Page 24: Check Point Of Every 50 Hours

    GENERAL EA330-E4, WSM [2] CHECK POINT OF EVERY 50 HOURS Checking Air Cleaner Element IMPORTANT • When used in a dustily place, check the cleaner every day, and clean. 1. Ensure that the element (1) or the dust cup (2) is not clogged by dirt or dust.
  • Page 25 GENERAL EA330-E4, WSM Cleaning Fuel Element CAUTION • If the element is damaged, replace it. Otherwise, dust may enter the injection pump and the nozzle, shortening their service life. 1. Close the fuel valve. 2. Loosen the retainer ring (2) on the cap (3) and the bolt mounting element holder, take out the cap, and clean out any dust or water collected in the bottom of it.

  • Page 26: Special Tools

    GENERAL EA330-E4, WSM 5. SPECIAL TOOLS Special Use Puller Set Code No. • 07916-09032 Application • Use exclusively to pull out bearing, gears and other parts with ease. WSM000001GEG0011US0 Wet Liner Puller Code No. • 07916-30012 Application • A puller for pulling out the wet liner. It combines with a presser for pushing in the wet liner.
  • Page 27 GENERAL EA330-E4, WSM Oil Pressure Tester Code No. • 07916-32032 Application • Use to measure lubricating oil pressure. (1) Gauge (5) Adaptor 2 (2) Cable (6) Adaptor 3 (3) Threaded Joint (7) Adaptor 4 (4) Adaptor 1 (8) Adaptor 5 WSM000001GEG0015US0 G-11 KiSC issued 05, 2015 A...
  • Page 28 GENERAL EA330-E4, WSM NOTE • The following special tools are not provided, so make them referring to the figure. 9Y1211018GEG0013US0 Valve Guide Replacing Tool Application • Use to press out and press in the valve guide. 225 mm (8.86 in.) 70 mm (2.8 in.) 45 mm (1.8 in.) 20 mm dia.
  • Page 29 GENERAL EA330-E4, WSM Piston Pin Bushing Replacing Tool Application • Use to press out and to press fit the piston pin bushing. Material • S43C Heat Treatment • Hardening, Anneal. 22.90 to 22.95 mm dia. (0.9016 to 0.9035 in. dia.) 19.90 to 19.95 mm dia.
  • Page 30 GENERAL EA330-E4, WSM Crank Gear Puller Application • Use exclusively to pull out easily the crank gear. Material • (1) Hexagonal Bar Steel • (2) SS41 125 mm (4.92 in.) 95 mm (3.7 in.) 5 mm (0.2 in.) 20 mm (0.79 in.) 10 mm (0.39 in.) 19 mm (0.75 in.) 10 mm dia.
  • Page 31 GENERAL EA330-E4, WSM Injection Pump Pressure Tester Application • Use to check fuel tightness of injection pumps. Pressure gauge full scale: More than 29.4 MPa (300 kgf/cm , 4270 psi) PF 1/2 Copper gasket Flange (Material Steel) Hex. nut 27 mm (1.1 in.) across the plat Adhesive application Fillet welding on the enter circumference Retaining nut...
  • Page 32 ENGINE KiSC issued 05, 2015 A...
  • Page 33 MECHANISM CONTENTS 1. FEATURE ........................... 1-M1 2. ENGINE BODY........................... 1-M2 [1] CYLINDER HEAD ........................ 1-M2 [2] VALVE MECHANISM ......................1-M4 [3] CYLINDER BLOCK AND CYLINDER LINER ............... 1-M6 [4] CRANKSHAFT AND CRANKSHAFT JOURNAL BEARING ..........1-M6 [5] PISTON AND PISTON RING ....................1-M7 [6] CONNECTING ROD AND CONNECTING ROD BEARING..........

  • Page 34: Feature

    ENGINE EA330-E4, WSM 1. FEATURE NOTE • Figure shows EA330 engine The EA330-E4 series engines are horizontal, water-cooled 4-cycle diesel engine. They incorporated KUBOTA's foremost technologies. With KUBOTA's exclusive E-TVCS (Three Vortex Combustion System) combustion chamber and 2-shaft dynamic balances, well-known Bosch M type injection pump, they give greater power, low fuel consumption, little vibration and quiet operation.

  • Page 35: Engine Body

    ENGINE EA330-E4, WSM 2. ENGINE BODY [1] CYLINDER HEAD As the cylinder head is subjected to high temperature and high pressure, it is made of special alloy iron. The cylinder head is installed on top of the cylinder block, it houses the intake and exhaust valves (4), rocker arm (1), injection nozzle (3), and others.
  • Page 36 ENGINE EA330-E4, WSM This engine employs KUBOTA's exclusive (Three Vortex Combustion System) system. This system provides three swirls inside a spherical vortex chamber during the combustion stroke for effective combustion. Specific fuel consumption is improved by approx. 10 % over our conventional engines. This combustion system also features good starting performance and reduced noise.

  • Page 37: Valve Mechanism

    ENGINE EA330-E4, WSM [2] VALVE MECHANISM This engine adopts the overhead valve (OHV) mechanism. The intake and exhaust valves (7), (1) open and close as follows: 1. The crankshaft rotation is transmitted to the camshaft via the timing gears (crank gear (12), cam gear (10) and idle gear (11)).
  • Page 38 ENGINE EA330-E4, WSM 2) Valve Timing The valve opening and closing timing is extremely important for effectively taking air into the cylinder and sufficiently discharging unnecessary exhaust gas. An appropriate timing can be obtained by aligning the alignment line on the crank gear, idle gear and cam gear.

  • Page 39: Cylinder Block And Cylinder Liner

    ENGINE EA330-E4, WSM [3] CYLINDER BLOCK AND CYLINDER LINER The cylinder block is made of aluminium die-cast. The cylinder block is provided with oil galleries to lubricate the crankshaft, main bearing case and rocker arm bracket. The cylinder liner (1) made of special cast iron having excellent wear resistance, is press fitted into the cylinder block.

  • Page 40: Piston And Piston Ring

    ENGINE EA330-E4, WSM [5] PISTON AND PISTON RING Since the piston is always subjected to high temperature and high pressure and reciprocates within the cylinder, it must be lightweight, tough, heat resistant, wear resistant, and of little thermal expansion. For this reason, the piston is made of High-silicone (aluminium alloy).

  • Page 41: Timing Gear

    ENGINE EA330-E4, WSM [7] TIMING GEAR The timing gears consisting of the crank gear (2), cam gear (1), idle gear (6), (7) and balancer gears (4), (5) serve to correctly control the intake and exhaust valves opening, closing timing, fuel injection timing and balance movement, etc.

  • Page 42: Dynamic Balancer

    ENGINE EA330-E4, WSM [10] DYNAMIC BALANCER The engine has a dynamic balancer (biaxial balancer) to offset primary force caused by the reciprocating motion of the piston. This significantly reduces engine vibration and resultant vibrating noises. 9Y1211018ENM0015US0 1-M9 KiSC issued 05, 2015 A...

  • Page 43: Lubricating System

    ENGINE EA330-E4, WSM 3. LUBRICATING SYSTEM [1] GENERAL (1) Rocker Arm (4) Crank Pin Portion (6) Relief Valve (8) Oil Strainer (2) Rocker Arm Bracket (5) Oil Signal (7) Trochoid Pump (9) Piston Pin Bushing (3) Oil Filler Ring Lubrication is forced on with a trochoid pump. Lubrication oil is sucked in by the trochoid pump (7) via an oil strainer (8) mounted on the side of the gear case.

  • Page 44: Oil Pump

    ENGINE EA330-E4, WSM [2] OIL PUMP The oil pump is of trochoid pump type, whose rotors have trochoid lobes. The inner rotor (3) has 4 lobes and the outer rotor (4) has 5 lobes, and they are eccentrically engaged with each other. The inner rotor, which is driven by the crankshaft through the gears, rotates the outer rotor in the same direction, varying the spaces between the lobes.

  • Page 45: Oil Signal

    ENGINE EA330-E4, WSM [5] OIL SIGNAL The oil signal is mounted to the cylinder block to warn the operator that the lubricating oil pressure is poor. At engine stop and at unusually low pressure (Less than 50 kPa, 0.5 kgf/cm , 7 psi), the red indication (2) is displayed.

  • Page 46: Cooling System

    ENGINE EA330-E4, WSM 4. COOLING SYSTEM [1] GENERAL This engine employ a pressurized radiator natural convection cooling system. Cooling by the radiator (1) and radiator fan (2) increases in specific gravity. And it absorbs combustion heat of the cylinder liner (5) and cylinder head (3) and friction heat generated from moving parts to cool them.

  • Page 47: Radiator Cap

    ENGINE EA330-E4, WSM [3] RADIATOR CAP Radiator Cap Function  When Radiator Pressure is High When temperature increases inside the radiator, there is expansion of water followed by conversion of water to steam as the temperature continues to increase. The pressure valve is designed to prevent internal pressure rising above specified opening pressure (110 kPa, 1.1 kgf/cm , 16 psi) in order to protect the...

  • Page 48: Intake / Exhaust System

    ENGINE EA330-E4, WSM 5. INTAKE / EXHAUST SYSTEM [1] GENERAL The intake / exhaust system consists of an intake system to supply clean air into the cylinder and an exhaust system to reduce exhaust noise. The intake system consists of an air cleaner (3) and an inlet pipe (5).

  • Page 49: Fuel System

    ENGINE EA330-E4, WSM 6. FUEL SYSTEM [1] GENERAL (1) Fuel Overflow Pipe (4) Injection Pump (7) Fuel Pipe 2 (9) Fuel Pipe 1 (2) Injection Nozzle (5) Air Vent Pipe 1 (8) Fuel Filter (10) Fuel Tank (3) Injection Pipe (6) Air Vent Pipe 2 Fuel from the fuel tank (10) passes through the fuel filter (8), and then enters the injection pump (4) after impurities such as dirt, water, etc.

  • Page 50: Injection Pump

    ENGINE EA330-E4, WSM [2] INJECTION PUMP A Bosch M type mini pump is used for the injection pump. It is small, lightweight and easy to handle. The plunger (4) with a left-hand lead reciprocates via the tappet roller (3) by means of the camshaft fuel cam, causing the fuel to be delivered into the injection nozzle.
  • Page 51 ENGINE EA330-E4, WSM Regulating Fuel Injection 1. No Fuel Delivery..Engine Stopped When the control rack (5) is set at the engine stop position, the plunger (2) is rotated to a position where the vertical slot (6) in the plunger (2 aligns with the feed hole (4).
  • Page 52 ENGINE EA330-E4, WSM 2) Delivery Valve The delivery valve consists of the relief valve (1) and delivery valve seat (2). (1) Relief Valve (2) Delivery Valve Seat 9Y1211018ENM0033US0 Delivery Valve Operation Non-return Function Time delay from the beginning of pressure-feeding of the pump element to the beginning of nozzle feed-injection becomes large when the delivery chamber of the pump and the injection nozzle are in alignment and...

  • Page 53: Injection Nozzle

    ENGINE EA330-E4, WSM [3] INJECTION NOZZLE Since the nozzle is a throttle type, only a small amount of fuel is injected at the initial stage of injection, and the amount increases gradually until a full amount is injected. As a result, combustion starts up more smoothly with less noise.

  • Page 54: Governor Mechanism

    ENGINE EA330-E4, WSM [4] GOVERNOR MECHANISM (1) Governor Spring (2) Stop Spring (3) Crank Gear (4) Governor Weight (5) Governor Shaft (6) Governor Lever (7) Speed Control Lever (8) Fuel Limiter (9) Idling Spring (10) Control Rack The governor maintains the constant engine speed and at the same time controls the output. The centrifugal mechanical governor used in this engine is an all-speed type which controls engine speed at any point between idling and maximum speed positions.
  • Page 55 ENGINE EA330-E4, WSM (1) Governor Spring (2) Stop Spring (3) Crank Gear (4) Governor Weight (5) Governor Shaft (6) Governor Lever (7) Speed Control Lever (8) Fuel Limiter (9) Idling Spring (10) Control Rack  At Idling to Maximum Speeds When the engine rotates at idling to maximum speeds, engine rotates at a constant speed at the point where the governor spring tension and the governor weight's centrifugal force are well balanced.

  • Page 56: Fuel Filter

    ENGINE EA330-E4, WSM [5] FUEL FILTER Each moving part of the injection pump and nozzle is extremely precision machined, and clearances of their sliding parts are extremely small. Fuel itself serves as lubricating oil. For this reason, it is extremely important to completely remove water and dirt contained in fuel.

  • Page 57: Electrical System

    ENGINE EA330-E4, WSM 7. ELECTRICAL SYSTEM [1] GENERAL EA330-E4-NB1 (1) Battery (option) (5) Fan Dynamo (8) Oil Lamp (11) Glow Lamp Timer (2) Starter (6) Switch Box (9) Glow Lamp (12) Fuse (3) Oil Switch (option) (7) Starter Switch (10) Regulator (4) Glow Plug Color of Wiring Bl........Black...

  • Page 58: Fan Dynamo

    ENGINE EA330-E4, WSM The electrical system of this engine comes equipped with the starter, glow plug, fan dynamo and switch box as standard. The fan dynamo is a single-phase alternating current generator built in the radiator fan. The rectifier rectifies the single-phase alternating current.

  • Page 59: Starter

    ENGINE EA330-E4, WSM [3] STARTER (1) Drive End Frame (6) Bushing (11) Brush Spring (16) End Frame Cap (2) Drive Lever (7) Collar (12) Bushing (17) Yoke (3) Cover (8) Snap Pin (13) Gasket (18) Brush Holder (4) Magnet Switch (9) Overrunning Clutch (14) Brake Spring (19) End Frame...
  • Page 60 ENGINE EA330-E4, WSM 1) Starting Motor The starting motor converts the electrical energy into rotary mechanical energy to crank the engine, and is composed of an armature, commutator, field coil, brushes and others. (1) Armature Shaft [A] Armature Construction (2) Stopper [B] Field Coil and Brush (3) Coil Constructions...
  • Page 61 ENGINE EA330-E4, WSM 2) Overrunning Clutch The overrunning clutch prevents the armature from being driven by the rotational force of the engine when the pinion and the engine flywheel ring gear are in mesh. 1. When power is transmitted, the rotational force of the outer clutch gear (1) drives the pinion gear (6) through the roller (2).
  • Page 62 ENGINE EA330-E4, WSM 4) Magnet Switch The magnet switch serves as a relay to drive the armature. It consists of a pull-in coil, a holding coil and a plunger. It works as follows. 1. When the starter switch is set to START position, the armature is rotated at a small amperage as the pull-in coil (9) and the holding coil (7) attract the plunger (6) to the left.
  • Page 63 ENGINE EA330-E4, WSM 5) Operation of Starter  When Starter Switch is Turned to START Position Current from the battery flows through the pull-in coil and holding coil, producing the magnetism in the windings to pull the plunger in. At this time, the drive lever moves the pinion to engage with the ring gear.

  • Page 64: Glow Plug

    ENGINE EA330-E4, WSM [4] GLOW PLUG The glow plug is used for pre-combustion chamber of the cylinder head to make starting easier. The glow plug is quick-heating type, which makes starting easier with short pre-hearing time 9Y1211018ENM0050US0 1-M31 KiSC issued 05, 2015 A...
  • Page 65 SERVICING CONTENTS 1. TROUBLESHOOTING.........................1-S1 2. SERVICING SPECIFICATIONS ....................1-S5 3. TIGHTENING TORQUES......................1-S11 [1] TIGHTENING TORQUES FOR SPECIAL USE SCREWS, BOLTS AND NUTS....1-S11 [2] TIGHTENING TORQUES FOR GENERAL USE SCREWS, BOLTS AND NUTS....1-S12 4. CHECKING, DISASSEMBLING AND SERVICING ..............1-S13 [1] CHECKING AND ADJUSTING....................1-S13 (1) Engine Body ........................1-S13 (2) Lubricating System ......................1-S16 (3) Cooling System ......................1-S17...

  • Page 66: Troubleshooting

    ENGINE EA330-E4, WSM 1. TROUBLESHOOTING Reference Symptom Probable Cause Solution Page Engine Does Not No fuel Replenish fuel – Start Air in the fuel system Vent air – Water in the fuel system Replace fuel and G-9, 1-M16 repair or replace fuel system Fuel hose clogged Clean...
  • Page 67 ENGINE EA330-E4, WSM Reference Symptom Probable Cause Solution Page Starter Does Not Run Battery discharged Charge – Starter malfunctioning Repair or replace 1-S22, 1-S42, 1-S61, 1-S62, 1-S63, 1-S64 Starter switches malfunctioning Replace – Wiring disconnected Connect 1-M24 Engine Revolution Is Fuel filter clogged or dirt Clean or replace Not Smooth...
  • Page 68 ENGINE EA330-E4, WSM Reference Symptom Probable Cause Solution Page Excessive Lubricant Piston ring's gap facing the same direction Shift ring gap 1-S36 Oil Consumption direction Oil ring worn or stuck Replace 1-S37, 1-S52 Piston ring groove worn Replace the piston 1-S52 Valve stem and valve guide worn Replace...
  • Page 69 ENGINE EA330-E4, WSM Reference Symptom Probable Cause Solution Page Engine Overheated Engine oil insufficient Replenish Fan belt broken or tensioned improperly Replace or adjust 1-S17 Coolant insufficient Replenish Radiator net and radiator fin clogged with dust Clean Inside of radiator corroded Clean or replace 1-S25 Coolant flow route corroded...

  • Page 70: Servicing Specifications

    ENGINE EA330-E4, WSM 2. SERVICING SPECIFICATIONS ENGINE BODY Item Factory Specification Allowable Limit Cylinder head surface Flatness – 0.05 mm / 100 mm 0.002 in. / 3.94 in. Top Clearance 0.60 to 0.80 mm – 0.024 to 0.031 in. Compression Pressure 3.48 MPa 2.60 MPa 35.5 kgf/cm...
  • Page 71 ENGINE EA330-E4, WSM Item Factory Specification Allowable Limit Rocker Arm shaft and Rocker Arm I.D. Oil Clearance 0.016 to 0.045 mm 0.15 mm 0.00063 to 0.0017 0.0059 in. • Rocker Arm Shaft O.D. 10.973 to 10.984 mm 0.43201 to 0.43244 in. –...
  • Page 72 ENGINE EA330-E4, WSM Item Factory Specification Allowable Limit Crankshaft and Oil Filler Ring Oil Clearance 0.025 to 0.066 mm 0.2 mm 0.00099 to 0.0025 in. 0.008 in. • Crankshaft O.D. 34.959 to 34.975 mm – 1.3764 to 1.3769 in. • Oil Filler Ring I.D.
  • Page 73 ENGINE EA330-E4, WSM Item Factory Specification Allowable Limit Cam Gear Side Clearance 0.0700 to 0.220 mm 0.3 mm 0.00276 to 0.00866 in. 0.01 in. Cylinder Liner I.D. 75.000 to 75.019 mm +0.25 mm 2.9528 to 2.9535 in. +0.0098 in. Projection of Cylinder Liner 0.030 to 0.13 mm –...
  • Page 74 ENGINE EA330-E4, WSM LUBRICATING SYSTEM Item Factory Specification Allowable Limit Engine Oil Pressure At Idle Speed 50 kPa – 0.5 kgf/cm 7 psi or more At Rated Speed 250 kPa 200 kPa (Engine Speed) 2.5 kgf/cm 2.0 kgf/cm 36 psi or more 28 psi (3000 rpm) (3000 rpm)
  • Page 75 ENGINE EA330-E4, WSM ELECTRICAL SYSTEM Item Factory Specification Allowable Limit Power Generation Performance Fan Speed 6900 min (rpm) – [Fan Dynamo: (EA330-E4-NB1, EA330-E4-NB1-APU-1)] Voltage Approx. 13 V – Current 1.6 to 2.6 A – Glow Plug Resistance Approx. 0.9 V –...

  • Page 76: Tightening Torques

    ENGINE EA330-E4, WSM 3. TIGHTENING TORQUES [1] TIGHTENING TORQUES FOR SPECIAL USE SCREWS, BOLTS AND NUTS Screw, bolts and nuts must be tightened to the specified torque using a torque wrench. Several bolts and nuts such as ones used on the cylinder head must be tightened in proper sequence and to the proper torque.

  • Page 77: Tightening Torques For General Use Screws, Bolts And Nuts

    ENGINE EA330-E4, WSM [2] TIGHTENING TORQUES FOR GENERAL USE SCREWS, BOLTS AND NUTS If the tightening torque is not specified, refer to the table below for the none specified torques values. Indication on No-grade or 4T top of bolt Indication on No-grade or 4T top of nut Unit...

  • Page 78: Checking, Disassembling And Servicing

    ENGINE EA330-E4, WSM 4. CHECKING, DISASSEMBLING AND SERVICING [1] CHECKING AND ADJUSTING (1) Engine Body Compression Pressure 1. Run the engine until warm up. 2. Stop the engine and remove the air cleaner and nozzle holder. 3. Attach a compression tester (Code No. 07909-30204) to the adapter B or H.
  • Page 79 ENGINE EA330-E4, WSM Valve Clearance IMPORTANT • The valve clearance must be inspected and adjusted as needed when the engine is cold (equal to the atmospheric air temperature). 1. Remove the cylinder head cover. 2. Align the T mark (1) on the flywheel with the fan cover mark (2) at the top dead center in the compression stroke.
  • Page 80 ENGINE EA330-E4, WSM Top Clearance 1. Tighten the cylinder head to the specified torque (57 to 61 N·m, 5.8 to 6.3 kgf·m, 42 to 45 lbf·ft). 2. Remove the nozzle holder. 3. Set the piston to the bottom dead center and insert a high-quality fuse through the nozzle holder hole.

  • Page 81: Lubricating System

    ENGINE EA330-E4, WSM (2) Lubricating System Engine Oil Pressure 1. Remove the oil signal (or oil switch) and install an oil pressure tester (Code No. 07916-32031) (Adaptor screw size: PT 1/8). 2. Start the engine. After warming up, measure the oil pressure of both idling and rated speeds.

  • Page 82: Cooling System

    ENGINE EA330-E4, WSM (3) Cooling System Fan Belt Tension 1. Check to see the belt tension allows a depression of the specified amount when the belt is pressed down by a finger midway between the cooling fan pulley (2) and tension pulley (5).
  • Page 83 ENGINE EA330-E4, WSM Radiator Cap Air Leakage 1. Set a radiator tester on the radiator cap. 2. Apply specified pressure and measure the time for the pressure to fall. 3. If the measurement is less than the factory specification, replace the radiator cap. 10 seconds or more 110 kPa (1.1 kgf/cm Radiator cap air leakage...

  • Page 84: Fuel System

    ENGINE EA330-E4, WSM (4) Fuel System Replacing Injection Pump 1. Remove the injection pump. 2. Remove the tamper proof cap and then remove the fuel limiter. 3. Mount a new injection pump and adjust the injection timing and the fuel limit position. A: <How to Adjust the Injection Timing>...
  • Page 85 ENGINE EA330-E4, WSM Delivery Valve Fuel Tightness 1. Remove the injection pipe. 2. Set an injection pump pressure tester to the injection pump. 3. In the same way as to check the pump element fuel tightness, turn the flywheel counterclockwise ten times or more so that the pressure is increased to specified pressure (Refer to the table).
  • Page 86 ENGINE EA330-E4, WSM CAUTION • Be careful not to come into direct contact with the injected spray destroys any cells it touches. It may also cause blood poisoning, etc, Check the injection nozzle after confirming that nobody is standing in the direction of the spray.

  • Page 87: Electrical System

    ENGINE EA330-E4, WSM (5) Electrical System Fan Dynamo 1. Check the continuity among the leads following the table Continuity Continuity Continuity Continuity Continuity Continuity 2. Check the continuity among the leads following the table (1) Lead (Red) (3) Lead (Yellow) (2) Lead (Yellow) 9Y1211018ENS0021US0 Starter...

  • Page 88: Disassembling And Assembling

    ENGINE EA330-E4, WSM [2] DISASSEMBLING AND ASSEMBLING (1) Draining Coolant and Oil Draining Coolant and Engine Oil CAUTION • During operation or immediately after operation, coolant in the radiator is extremely hot. If the radiator cap is removed, hot water may gush out, causing scalding.
  • Page 89 ENGINE EA330-E4, WSM Fuel Tank and Filter 1. Close the fuel valve (7) as shown in the photograph. 2. Remove the engine hook (1) and radiator cover (2). 3. Disconnect the overflow hose (3). 4. Remove the eye joint bolt of the injection pump to detach the fuel hose 2 (4).
  • Page 90 ENGINE EA330-E4, WSM Radiator (When reassembling) • Apply liquid gasket (Three Bond 1102 or equivalent) to the both sides of radiator gasket (2). 5.9 to 7.8 N·m Radiator mounting screw / Tightening torque 0.60 to 0.80 kgf·m 4.4 to 5.7 lbf·ft (1) Radiator Assembly (2) Radiator Gasket 9Y1211018ENS0030US0...

  • Page 91: Cylinder Head

    ENGINE EA330-E4, WSM (3) Cylinder Head (1) Nozzle Holder (2) Injection Pipe (3) Decompress Hole Cover (4) Cylinder Head Cover (5) Rocker Arm Bushing (6) Rocker Arm (7) Rocker Arm Bracket (8) Valve Cap (9) Valve Spring Collet (10) Valve Spring Retainer (11) Valve Spring (12) Exhaust Valve Guide (13) Exhaust Valve...
  • Page 92 ENGINE EA330-E4, WSM Nozzle Heat Seal Service Removal Procedure IMPORTANT • Use a plus (phillips head) screw driver that has a Dia. which is bigger than the heat seal hole (Approx. 6 mm (1/4 in.). 1. Drive screw driver lightly into the heat seal hole. 2.
  • Page 93 ENGINE EA330-E4, WSM Rocker Arm Bracket and Push Rod 1. Remove the rocker arm bracket (1) and rocker arms together. 2. Pull out the push rods (2). (When reassembling) • Apply engine oil to the rocker arm bushing bore and nut thread. •...
  • Page 94 ENGINE EA330-E4, WSM Valve 1. Remove the valve caps (5). 2. Remove the valve spring collets (4) with a valve lifter (6). 3. Remove the valve spring retainers (3), valve springs (2) and valves (1). (When reassembling) • Wash the valve stem and valve guide hole, and apply engine oil sufficiently.

  • Page 95: Gear Case

    ENGINE EA330-E4, WSM (4) Gear Case (1) Balancer (6) Idle Gear Shaft (10) Camshaft Stopper (14) Injection Pump Assembly (2) Balancer Gear 2 (7) Idle Gear (11) Breather Assembly (15) Pump Adjusting Shim (3) Balancer Gear 1 (8) Camshaft (12) Breather Oil Guard (16) Gear Case (4) Balancer Gear 3 (9) Camshaft Gear...
  • Page 96 ENGINE EA330-E4, WSM Injection Pump 1. Remove the injection pump mounting screws. 2. Move the speed control lever (3) and align the control rack pin (1) and notch (2) on the gear case to remove the injection pump. NOTE • Record the number of injection timing adjusting shims used to adjust the injection timing.
  • Page 97 ENGINE EA330-E4, WSM Cam Gear and Camshaft NOTE • Before disassembling, check the backlash of each gears. Also check them during reassembly. 1. Remove the lock plate mounting screw (2). 2. Remove the cam gear (1) and camshaft together. (When reassembling) IMPORTANT •...
  • Page 98 ENGINE EA330-E4, WSM Balancer Gear and Balancer NOTE • Before disassembling, check the backlash of the balancer gears 1 (2) and 2 (1). Also check it during reassembly. 1. From the inside of the cylinder block place a brass rod against the end of the balancer and tap it off to the gear case side with a hammer.
  • Page 99 ENGINE EA330-E4, WSM Governor Weight 1. Remove the governor weight (1) and governor weight holder (2) together. 9.81 to 11.2 N·m Governor weight holder Tightening torque 1.00 to 1.15 kgf·m mounting screw 7.24 to 8.31 lbf·ft (1) Governor Weight (2) Governor Weight Holder 9Y1211018ENS0050US0 1-S34 KiSC issued 05, 2015 A...

  • Page 100: Piston And Connecting Rod

    ENGINE EA330-E4, WSM (5) Piston and Connecting Rod (1) Piston (2) Connecting Rod (3) Crank PIn Bearing (4) Connecting Rod Cap (5) Connecting Rod Screw (6) Crankcase Cover (7) Piston RIng Assembly (8) PIston Pin (9) Piston Pin Bushing 9Y1211018ENS0051US0 Connecting Rod Cap 1.
  • Page 101 ENGINE EA330-E4, WSM Piston and Connecting Rod 1. Turn the flywheel and bring the piston to the top dead center. 2. Pull out the piston upward by tapping it from the bottom of the cylinder block with the grip of a hammer. (When reassembling) •...
  • Page 102 ENGINE EA330-E4, WSM Piston Ring and Connecting Rod 1. Remove the piston rings with a piston ring tool. 2. Put the parting mark (8) on the piston head as shown in the photograph. 3. Remove the piston pin (7), and separate the connecting rod (6) from the piston (1).

  • Page 103: Flywheel And Crankshaft

    ENGINE EA330-E4, WSM (6) Flywheel and Crankshaft (1) Pulley Shaft (2) Flywheel Nut (3) Flywheel (4) Oil Seal (5) O-ring (6) Oil Filler Ring (7) Internal Snap Ring (8) Main Bearing Case (9) O-ring (10) Main Bearing Retainer (11) Main Bearing 2 (12) Crankshaft (13) Main Bearing 1 (14) Crankshaft Gear...
  • Page 104 ENGINE EA330-E4, WSM Flywheel 1. Set a flywheel puller (Code No. 17916-04052) and remove it with the flywheel. IMPORTANT • Clean the flywheel and crankshaft tapered section to be free from any dirt or chips. Also take care so that oil does not stick to the crankshaft tapered section.
  • Page 105 ENGINE EA330-E4, WSM Main Bearing Case and Crankshaft 1. Remove the bolts retaining (1) and the bearing retainer. 2. Remove the flywheel key (2) from the crankshaft. 3. Tap the main bearing case (3) with a plastic hammer to separate it from crankshaft. (When reassembling) •...
  • Page 106 ENGINE EA330-E4, WSM Crank Gear and Main Bearing 1 1. Secure the crankshaft with a vise and installing a crank gear puller. 2. Pull out the crank gear. (When reassembling) • Tap the outer ring (5) of the main bearing 1 (roller bearing near the gear case) into the cylinder block (3) until the end surface of the outer ring (5) is flush with that of the cylinder block (3).

  • Page 107: Starter

    ENGINE EA330-E4, WSM (7) Starter Magnet Switch 1. Disconnect the connecting lead. 2. Remove the mounting nut. 3. Remove the magnet switch (1) by sliding it up so that it is disconnected from the drive lever. (1) Magnet Switch 9Y1211018ENS0064US0 Armature Brake 1.
  • Page 108 ENGINE EA330-E4, WSM Yoke 1. Draw out the yoke (1) from the drive end frame. (When reassembling) • Install the yoke, nothing the location of dowel pin. (1) Yoke 9Y1211018ENS0068US0 Armature 1. Draw out the armature (2) with the drive lever (1). (When reassembling) •...

  • Page 109: Servicing

    ENGINE EA330-E4, WSM [3] SERVICING (1) Cylinder Head and Valves Cylinder Head Surface Flatness 1. Clean the surface of the cylinder head. 2. Place a straight edge on each of the cylinder head's four sides and two diagonal as shown at the right to check the straightness of the surface.
  • Page 110 ENGINE EA330-E4, WSM Valve Recessing 1. Clean the cylinder head, the valve face and seat. 2. Insert the valve into the guide. 3. Measure the valve recessing "A" with a depth gauge. 4. If the recession exceeds the allowable limit, replace the valve. In addition, repair the cylinder head seat surface with a valve seat cutter or valve seat grinder, and then repair the head surface with a surface grinder.
  • Page 111 ENGINE EA330-E4, WSM Correcting Procedure for Valve Seat NOTE • Always try to minimize the valve seat recession. 1. Correct the valve seat surface with a 0.79 rad (45 °) valve seat cutter. 2. Place the valve and visually check the contact position between the valve face and valve seat with red lead.
  • Page 112 ENGINE EA330-E4, WSM Replacing Valve Guide (When removing) 1. Press out valve guide with a valve guide replacing tool. (When installing) 1. Clean the valve guide bore, and apply engine oil to it. 2. Press in the valve guide until its flange contacts the cylinder head.
  • Page 113 ENGINE EA330-E4, WSM Valve Spring Tilt 1. Place the spring on the surface plate and a square at its side. 2. Measure the free length "A" (See figure) by rotating spring. 3. If the measurement exceeds the allowable limit, replace the valve spring.
  • Page 114 ENGINE EA330-E4, WSM Push Rod Alignment 1. Check the both end of the push rod for cracks, damage and unusual wear. 2. Measure the bending of the push rod with a dial indicator. 3. If the measurement exceeds the allowable limit, replace the push rod.

  • Page 115: Piston And Connecting Rod

    ENGINE EA330-E4, WSM (2) Piston and Connecting Rod Piston Skirt O.D. 1. Measure the piston skirt O.D. with an outside micrometer. (Measuring points are shown in the figure.) 2. If the measurement is less than the allowable limit, replace the piston.
  • Page 116 ENGINE EA330-E4, WSM Replacing Piston Pin Bushing (When removing) 1. Press out piston pin bushing with a piston pin bushing replacing tool. (When installing) 1. Clean the new bushing and bore, and apply engine oil to them. 2. Insert a new bushing onto the tool and press-fit it with the press so that the oil holes (2) are aligned as shown in the figure, until it is flush with the connecting rod.
  • Page 117 ENGINE EA330-E4, WSM Piston Ring Gap 1. Insert the piston ring into the lower part of the liner (Measuring points are shown in the figure) with a piston ring compressor and the piston. 2. Measure the ring gap with a feeler gauge. 3.

  • Page 118: Crankshaft

    ENGINE EA330-E4, WSM (3) Crankshaft Oil Clearance between Crank Pin and Bearing 1. Put a strip of press gauge lengthwise on the center of the crank pin in each direction as shown in the figure. 2. Install the connecting rod cap and tighten the screws to the specified torque (27 to 30 N·m, 2.7 to 3.1 kgf·m, 20 to 22 lbf·ft) once, and remove the cap again.
  • Page 119 ENGINE EA330-E4, WSM Crankshaft Side Clearance 1. Move the crankshaft to the flywheel side. 2. Attach a dial gauge to the crankshaft (3). 3. Measure the end play by pushing the crankshaft toward the crank gear (5). 4. If the measurement exceeds the allowable limit, replace the main bearing retainer (1).

  • Page 120: Timing Gear And Camshaft

    ENGINE EA330-E4, WSM (4) Timing Gear and Camshaft Timing Gear Backlash 1. Set a dial indicator (lever type) with its tip on the gear tooth. 2. Move the gear to measure the backlash, holding its mating gear. 3. If the backlash exceeds the allowable limit, check the oil clearance of the shafts and gear.
  • Page 121 ENGINE EA330-E4, WSM Oil Clearance between Idle Gear Shaft and Bushing 1. Measure the idle gear shaft O.D. with an outside micrometer. 2. Measure the idle gear bushings I.D. with an inside micrometer, and calculate the oil clearance. 3. If the clearance exceeds the allowable limit, replace the bushing.
  • Page 122 ENGINE EA330-E4, WSM Oil Clearance of Camshaft 1. Measure the camshaft journal O.D. with an outside micrometer. 2. Measure the camshaft bore I.D. withe an inside micrometer and calculate the oil clearance. 3. If the clearance exceeds the allowable limit, replace the camshaft.
  • Page 123 ENGINE EA330-E4, WSM Camshaft Alignment 1. Support the camshaft with V block on the surface plate and set a dial indicator with its tip on the intermediate journal at right angle. 2. Rotate the camshaft on the V block and get the misalignment (half of the measurement).

  • Page 124: Cylinder Liner

    ENGINE EA330-E4, WSM (5) Cylinder Liner Cylinder Liner I.D. 1. Visually check the cylinder liner I.D. for vertical scratches. 2. Measure the six points as shown in the figure with a cylinder gauge to find out the maximum wear. Generally, position (1) in the (a) direction (at approx.

  • Page 125: Oil Pump

    ENGINE EA330-E4, WSM (6) Oil Pump Clearance between Inner Rotor and Outer Rotor 1. Measure the clearance between a high point on the inner rotor and high point on the outer rotor with a feeler gauge. 2. If the clearance exceeds the allowable limit, replace the oil pump rotor assembly.

  • Page 126: Starter

    ENGINE EA330-E4, WSM (7) Starter Magnet Switch NOTE • Each test should be carried out for a short time (3 to 5 seconds), and at half of the rated voltage (6V). 1) Pull - in Coil (Attraction Test) 1. Connect jumper lead from the battery negative terminal post to the C terminal.
  • Page 127 ENGINE EA330-E4, WSM Commutator and Mica 1. Check the contact face of the commutator for wear, and grind the commutator with sand paper if it is slightly worn. 2. Measure the commutator O.D. at several points. 3. If the difference of the O.D.'s exceeds the allowable limit, correct the commutator on a lathe to the factory specification.
  • Page 128 ENGINE EA330-E4, WSM Armature Coil 1. Check the continuity across the commutator and armature shaft with an ohmmeter. 2. If it conducts, replace the armature. 9Y1211018ENS0115US0 Brush Wear 1. Measure the brush length (A). 2. If the length is less than the allowable limit, replace the brush holder.
  • Page 129 ENGINE EA330-E4, WSM Bearing and Clutch 1. Check the bearing and clutch for smooth rotation. 2. The clutch should engage and rotate with the pinion shaft in driving direction and disengage in reverse. (a) Free (b) Lock 9Y1211018ENS0119US0 1-S64 KiSC issued 05, 2015 A...
  • Page 130 : Farm and Industrial Machinery International Service Department Address : 64, Ishizu-Kitamachi, Sakai-Ku, Sakai-City, Osaka, 590-0823, Japan Phone : +81-72-241-1129 : +81-72-245-2484 E-mail : ks_g.ksos-pub@kubota.com Printed in Japan 2015. 05, S, EI, EI, engusa Code No.9Y111-10181 KUBOTA Corporation 2013. 12, S, EI, EI, engusa...

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