Subaru ER12 Service Manual
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Subaru ER12 Service Manual

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SERVICE MANUAL

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  • Page 1 ER12 ER12 SERVICE MANUAL...

  • Page 3: Table Of Contents

    CONTENTS Section Title Page 1. SPECIFICATIONS..........1 2.

  • Page 5: Specifications

    1. SPECIFICATIONS Model ER12 Air-Cooled, 4-Cycle, Single-Cylinder, Type Horizontal P.T.O. Shaft, OHC Gasoline Engine Bore × Stroke mm (in .) 60 × 43 (2.36 × 1.69) Piston Displacement ml (cu .in .) 121 (7.38) Compression Ratio Maximum Output kW(HP)/r .p .m .

  • Page 6: Performance

    2. PERFORMANCE 2-1 MAXIMUM OUTPUT The Maximum output is the output of an engine with its throttle valve fully opened and considering that all the moving parts are properly broken in . A new engine may not produce full maximum output while its moving parts are still not broken-in . NOTE : Power curves shown in the following charts are made in conformity with SAE internal combustion engine standard test code J1349 .
  • Page 7 2-4. PERFORMANCE CURVES [kgf ・ m] N ・ m MAXIMUM TORQUE [HP] MAXIMUM HORSEPOWER RECOMMENDED HORSEPOWER RANGE 2000 3000 4000 REVOLUTION r.p.m. - 3 -...

  • Page 8: Features

    9 .9kg, and the smallest-in-class* on the length and width . 3-3. DESIGNED TO OFFER SUPERIOR MOUNTABILITY ER12 has been designed to offer superior mountability, which is valued for rammer engine, by the optimal center of gravity for right-and-Ieft balance .

  • Page 9: General Description Of Engine Components

    4. GENERAL DESCRIPTION OF ENGINE COMPONENTS 4-1 CYLINDER AND CRANKCASE The cylinder and crankcase are aluminum die-casting as a single piece . A special cast iron cylinder liner is molded into the aluminum die-casting . The crankcase has a mounting surface on the output shaft side to which the main bearing cover is attached .
  • Page 10 4-5 PISTON RINGS The piston rings are made of special cast iron . The profile of the top ring is a tapered face . The oil ring is designed for better sealing and less oil consumption, in combination with 3 pieces . TAPER RING THREE-PIECE...
  • Page 11 4-8 CYLINDER HEAD The cylinder head is on aluminum die-casting with a lens-shaped combustion chamber . The intake and exhaust ports are arranged in a cross direction to improve combustion efficiency . 4-9 GOVERNOR SYSTEM This engine is equipped with a centrifugal flyweight type governor that makes it possible to operate the engine at a constant speed, even with load GOVERNOR...
  • Page 12 4-12 TIMING BELT CAMPULLEY Timing belt system is adopted and designed for lubricating for the upper portion of cylinder head . The timing belt is engaged between the campulley in TIMING BELT the cylinder head and the crankshaft gear . The pulley and the gear teeth in round shape are DRIVEPULLEY adopted to enhance the durability and to realize low...
  • Page 13 4-15 AIR CLEANER AIR CLEANER BASE ELEMENT The air-cleaner is a heavy-duty type with a dual URETHANE FOAM element system; the primary one is an urethane foam (semi-wet) and secondary one is a semi wet type element . AIR CLEANER COVER 4-16 DECOMPRESSION SYSTEM The automatic decompression system is mounted on RETURN SPRING...
  • Page 14 4-17 SECTIONAL VIEW OF THE ENGINE Cross sectional view – across the shaft CYLINDER HEAD SPARK PLUG PISTON PISTON RING IGNITION COIL PISTON PIN RECOIL STARTER OIL PRESSURE SWITCH OIL PUMP P.T.O. SHAFT CRANKSHAFT ADAPTER FLYWHEEL MAIN BEARING COVER CRANKCASE PLUG SUCTION PIPE SER No.
  • Page 15 Cross sectional view – along the shaft ROCKER COVER FLOAT TYPE CARBURETOR ROCKER ARM CAMPULLEY INTAKE VALVE CARBURETOR (DIAPHRAGM TYPE) EXHAUST VALVE MUFFLER AIR CLEANER PISTON RING GOVERNOR LEVER TIMING BELT STOP SWITCH CONNECTING ROD SPEED CONTROL LEVER OIL GAUGE GOVERNOR GEAR BREATHER COVER SER No.

  • Page 16: Disassembly And Reassembly

    5. DISASSEMBLY AND REASSEMBLY 5-1 PREPARATIONS AND PRECAUTIONS 1) When disassembling the engine, memorize the location of each part so that you can reassemble the engine correctly . If necessary, attach identification tags with the required assembly information to the parts . 2) Store groups of parts in separate boxes .

  • Page 17: Disassembly Procedure

    5-3 DISASSEMBLY PROCEDURE Step Parts to remove Remarks and procedures Fasteners Drain the engine oill Remove a drain plug (M8 x 12mm) located on both 12 mm spanner sides of the case . Take care not to lose the gaskets . * To discharge oil quickly, remove the oil gauge(M22) .
  • Page 18 Step Parts to remove Remarks and procedures Fasteners Muffler and Muffler cover (1) Remove the muffler cover from the muffler and 10mm box spanner or gasket(muffler) . spanner (2) Remove the muffler from the cylinder head . 13mm box spanner Take care not to lose the gasket .
  • Page 19 Step Parts to remove Remarks and procedures Fasteners Carburetor, Insulator Remove the linkage bushing from governor rod . 10mm box spanner or spanner (1) Loosen the and remove the governor lever from M6×20mm:1pc . the governor shaft . There is no need to remove the M6 Nut:1pc .
  • Page 20 Step Parts to remove Remarks and procedures Fasteners Speed control lever and Remove the speed control lever and base plate from 10mm box spanner Base plate the crankcase . (If necessary) M6×10mm:2pcs . 14mm box spanner Pivot bolt:1pc . SET SCREW (HIGH SPEED) BASE PLATE SET SCREW (LOW SPEED) SPEED CONTROL...
  • Page 21 Step Parts to remove Remarks and procedures Fasteners Cylinder baffle Remove the Cylinder baffle . (If necessary) 10 mm box spanner M6 x 10 mm : 3 pcs . Breather Remove the breather cover and plate . (If necessary) 8 mm box spanner M6 x 20 mm : 4 pcs .
  • Page 22 Step Parts to remove Remarks and procedures Fasteners Flywheel Remove the starting pully from the flywheel . 19 mm socket wrench Fit a box wrench or a socket wrench on the flywheel nut M14 nut : 1pc . and loosen the nut by knocking the wrench sharply with a hammer .
  • Page 23 Step Parts to remove Remarks and procedures Fasteners Spark plug Remove the spark plug from the cylinder head . 16mm plug wrench Rocker cover (1) Remove the rocker cover from the cylinder head . 10mm box spanner (2) Remove the gasket (rocker cover) M6×14mm : 2pcs .
  • Page 24 Step Parts to remove Remarks and procedures Fasteners Oil pump Remove oil pump cover o-ring outer rotor and inner 8mm box wrench M6×12mm:4pcs . rotor . MAIN BEARING COVER OUTER ROTOR OIL PUMP COVER M6×12 FLANGE BOLT:4pcs. INNER ROTOR O-RING (SYNTHETIC RUBBER) - 20 -...
  • Page 25 Step Parts to remove Remarks and procedures Fasteners Main bearing cover Remove the flange bolts of main bearing cover from 12mm box wrench the crankcase . M8×55mm:6pcs . Remove the main bearing cover while tapping gently around the cover using a plastic hammer or similar tool .
  • Page 26 Step Parts to remove Remarks and procedures Fasteners Switch (Oil pressure) Remove the oil pressure switch . (If necessary) 24mm spanner Plug and suction pipe Remove the plug and suction pipe from the main M5×12mm:2pcs . bearing cover . (If necessary) SWITCH (OIL PRESSURE) MAIN BEARING COVER...
  • Page 27 Step Parts to remove Remarks and procedures Fasteners Campulley (1) Remove the retaining bolt of pin (campulley) from the 10mm box spanner cylinder head . M6×8mm:1pc . (2) Remove the pin (campulley), taking care not to scratch the Pliers O-ring . (3) Remove the timing belt from the campulley and then take out the campulley .
  • Page 28 Step Parts to remove Remarks and procedures Fasteners Cylinder head (1) Remove the cylinder head from the crankcase . 12mm box spanner (2) Remove the cylinder head gasket from the cylinder head . M8×98mm:4pcs . Take care not to lose the pipe knock Intake and exhaust (1) Remove the collet valve from the spring retainer .
  • Page 29 Step Parts to remove Remarks and procedures Fasteners Connecting rod and piston (1) Scrape off any carbon from the cylinder and the 8mm box spanner piston head, then remove the connecting rod bolt . M5×25mm:2pcs . (2) Remove the connecting rod cap . (3) Rotate the crankshaft until the piston comes to its top position .
  • Page 30 Step Parts to remove Remarks and procedures Fasteners Crankshaft (1) Remove the woodruff key (for the flywheel magneto) . (2) Remove the crankshaft from the crankcase Plastic hammer by tapping its magneto side end with a plastic hammer, taking care not to damage the oil seal . OIL SEAL (PRESS FITTING) WASHER E-CLIP...

  • Page 31: Reassembly Procedure

    5-4 REASSEMBLY PROCEDURE 5-4-1 NOTES ON REASSEMBLY (1) Clean the each parts carefully, taking special care with the piston, cylinder, crankshaft, connecting rod and bearings . (2) Scrape off any carbon deposits on the cylinder head and the piston head . Be particularly careful when removing carbon from the piston ring grooves .
  • Page 32 (2) PISTON AND PISTON RINGS (a) Install each piston ring in the correct groove of OPEN ENDS OF PISTON RING the piston by widening it enough to slide it over the piston . NOTE: Be careful not to twist the rings too much, as they may be damaged .
  • Page 33 (3) PISTON AND CONNECTING ROD The piston is attached to the connecting rod by the piston pin . When assembling the piston and connecting rod, make sure to align the mark on the piston When assembling head with the ‘JCC’ mark on the connecting rod . the piston and connecting rod, NOTE 1: Before assembling the connecting rod,...
  • Page 34 (b) Rotate the crankshaft down to the bottom dead center and lightly tap the piston head until the large end of the connecting rod touches the crank pin . (c) To mount the connecting rod, line up the matching marks and fit the clinch portions firmly together . ALIGNMENT MARKS M5×25mm Connecting rod bolt : 2pcs .
  • Page 35 (6) CYLINDER HEAD (a) Inspect and repair any scratches on mounting surface and replace head gasket to new one before installing . (b) Insert the pipe knocks between crankcase and cylinder head . Install cylinder head onto cylinder with new head gasket . Apply oil to the screw thread .
  • Page 36 (8) ADJUST CRANKSHAFT END PLAY (1) Adjust end play to 0 .2 mm (0 .008") using the proper spacer . DEPTH GAUGE The proper spacer may be determined in the following manner . 1) Measure the height “A” (From the mating surface to the inner race of the ball bearing .) 2) Measure the depth “B”...
  • Page 37 (9) MAIN BEARING COVER (a) Insert the plug, suction pipe and oil pressure switch . PLUG SUCTION PIPE OIL PRESSURE SWITCH 0 .8 - 1 .2 N ・ m 6 .0- 8 .0 N ・ m 8 .0 - 10 .0 N ・ m (8 - 12 kgf ・...
  • Page 38 (10) OIL PUMP and COVER (1) Apply oil to inner and outer rotors of oil pump and attach them in position . O-RING OIL PUMP COVER (SYNTHETIC RUBBER) (2) Set O-ring in position . OUTER ROTOR ALLOW (3) Install oil pump cover with the allow marking MARKING upwards .
  • Page 39 (12) VALVE CLEARANCE ADJUSTMENT Adjust the valve clearance insert the thickness gauge to the portions. Temporarily fit the flywheel . Rotate the crankshaft up to the compression top dead center and insert the thickness gauge between the valve and the adjusting screw of rocker arm to measure the clearance .
  • Page 40 (14) SPARK PLUG Remove any carbon deposits from the spark plug and inspect the electrode for damage before mounting . Replace with a new one, if necessary . Spark plug : NGK CR5HSB (16 mm plug wrench) 0.6 - 0.7 mm Electrode gap (0.024 - 0.028 in.) Tightening torque...
  • Page 41 (17) BREATHER Assemble gasket (breather plate), breather plate, gasket(breather cover) refer to the following . M6 × 20 mm flange bolt : 4 pcs . Tightening torque 7 .0 - 9 .0 N ・ m (70 - 90 kgf ・ cm) (5 .1 - 6 .5 ft ・...
  • Page 42 (19) SPEED CONTROL Install the speed control to the top breather BREATHER COVER FLANGE BOLT cover with the bolts . M6 × 10 mm flange bolt : 2 pcs . SPEED CONTROL AY SET SCREW (HIGH SPEED) BASE PLATE SET SCREW (LOW SPEED) SPEED CONTROL LEVER SWIVEL (NUT) M4 x 0.7...
  • Page 43 (20) GOVERNOR LEVER, CARBURATOR ROD SPRING LINKAGE (a) Mount the governor lever on the governor BUSHING shaft . Do not adjust the bolt on the governor lever yet . GOVERNOR ROD (b) Attach the governor rod and rod spring to the governor lever .
  • Page 44 GASKET M5 x 70mm BOLT : 2 pcs. (INSULATOR) INSULATOR 2 GASKET RUBBER PIPE (CARBURETOR) ADAPTER INSULATOR 1 (INTAKE) GASKET (INSULATOR) AIR CLEANER BASE GASKET M5 SELF LOCK NUT : 2pcs. (CARBURETOR) RUBBER PIPE ELEMENT AIR CLEANER COVER DIAPHRAGM TYPE CARBURETOR (22) ADJUST GOVERNOR SYSTEM (1) Turn the speed control lever all the way GOVERNOR ROD...
  • Page 45 (23) RECOIL STARTER Attach recoil starter to crankcase . Tighten flange bolts . M6 x 20 mm flange bolt : 2 pc . M6 x 14 mm flange bolt : 1 pcs . Tightening torque 7 .0 - 9 .0 N ・ m (70 - 90 kgf ・...
  • Page 46 (26) EXTERNAL INSPECTION Reassembly is completed . Check that the wiring is correct and that there are no loose nuts and bolts or any other faults visible on the outside of the engine . (27) FILLING WITH ENGINE OIL Use the automobile engine oil of API service class SE or higher grade . The amount of oil, refer to the table below .

  • Page 47: Engine Oil

    6. ENGINE OIL Using engine oil of the correct grade and viscosity greatly lengthens engine life and improves performance . Too much or too little oil can also result in serious problems, including engine seizure . 6-1 CLASSIFICATION BY OIL GRADE API (American Petroleum Institute) Classification Grades suited for Robin Engine: SE or higher (SG,SH or SJ in recomended)

  • Page 48: Lubrication System

    7. LUBRICATION SYSTEM 7-1 OPERATION AND FUNCTION Forced pressure spray and splash lubrication system are adopted, in combination with trochoid oil pump and plugged filter . The trochoid type oil pump is driven by crankshaft, and sprays pressurized engine oil to the crankshaft, connecting rod and inside of crankcase .
  • Page 49 7-2 OIL SENSOR The oil sensor system is composed of the oil pressure switch and CPU (Central Processing Unit) inside of the Ignition coil . In accordance with the oil level which means oil pressure, the pressure switch functions “ON” and “OFF” . The type of pressure switch is normally closed “ON” type . Switching pressure: 0.10 through 0.20 kg/cm (10 through 20KPa) While there is no pressure (No oil, or Low level), the diaphragm is pressed by the spring force, resulting...
  • Page 50 In rammer engines, a breather system is required complicated structure to separate oil and gas, reason why heavy vibration of up-and-down movement compared with stationary engines . Therefore, the ER12 rammer engine is adopted the design which overcame such a difficulty and becomes the high-performance with compact .

  • Page 51: Magneto

    8. MAGNETO 8-1 MAGNETO The SUBARU Engine uses are CDI . CPU magneto ignition system . (1) CDI . CPU (CDI : Capacitor Discharge Ignition . CPU : Central Processing Unit .) has the ignition coil outside the flywheel, which is the standard specification .

  • Page 52: Wiring Diagram

    9. WIRING DIAGRAM WIRING DIAGRAM Spark plug Ignition coil CDI, CPU Oil pressure Stop switch switch (Oil sensor) Flywheel CHECK THE IGNITION COIL ③ Round female terminal ① Flat female terminal ② Hgh tenstion code wire ④ Flat male terminal ⑤ Core * Checking table for analogue circuit tester. (Ω) (R±20%) Apply black ⊖...

  • Page 53: Automatic Decompression System

    10. AUTOMATIC DECOMPRESSION SYSTEM 10-1 FUNCTIONS AND CONSTRUCTION EX series engines employ an automatic decompression system as a standard feature . This enables easy starting of the engine, with lighter recoil pull . The automatic decompression system releases the compression of the engine by lifting up the exhaust valve at cranking speed .

  • Page 54: Carburetor

    11. CARBURETOR 11-1 SPECIFICATIONS Float type A/C Type Single Main Jet # 66 .3 Pilot Jet # 30 φ 12 Venturi Bore (mm) 11-2 FUNCTIONS AND CONSTRUCTION 11-2-1 FLOAT SYSTEM The float chamber is located below the carburetor body . Through the operation of the float and the needle valve, the float chamber maintains a constant fuel level while the engine is working .
  • Page 55 11-3 FLOAT TYPE CARBURETOR 11-3-1 OPERATION AND CONSTRUCTION FLOAT SYSTEM The float chamber is located below the carburetor body and, with a float and a needle valve, FUEL maintains a constant fuel level during engine operation . The fuel flows from the fuel tank into the float chamber through the needle valve .
  • Page 56 PILOT SYSTEM The pilot system feeds the fuel to the engine during idling and low-speed operation . The fuel is fed through the main jet to the pilot jet, where it is metered, and mixed with the air metered by the pilot air jet .
  • Page 57 CHOKE SYSTEM (1) Remove the philips screws ⑥ and choke valve ⑦, and pull out the choke shaft ⑧ . (2) When reassembling the choke shaft, make sure that the cutout in the choke valve faces the pilot air jet . Meanwhile . when reassembling set the at the right position . PILOT SYSTEM (1) Remove the bolt ⑨...
  • Page 58 11-4 DIAPHRAGM TYPE CARBURETOR 11-4-1 OPERATION AND CONSTRUCTION 1. ENGINE IMPULSE The alternating action of the positive pressure and negative pressure inside the engine crankcase operates the fuel pump diaphragm . 2. FUEL PUMP DIAPHRAGM The fuel pump diaphragm undulates in response to the engine impulse and as a result of that movement it feeds the fuel through the fuel pump valve .
  • Page 59 10. METERING DIAPHRAGM The metering diaphragm has the function of operating the metering lever, which is pulled up by the variations in the negative pressure of the engine . 11. METERING LEVER The metering lever has the function of opening/shutting the inlet needle valve by transmitting the movements of the metering diaphragm to that valve .
  • Page 60 19. VENTURI The venturi has the function of increasing the air flow at the nozzle section, thereby improving the atomization of the fuel . 20. CHOKE VALVE The choke valve has the function of shutting the suction of air when the engine is started at cold state, thereby securing the temporary supply of a rich fuel/air mixture .
  • Page 61 11-4-3 INSPECTION PROCEDURE (1) Wash the carburetor body with gasoline or the like and blow it with compressed air . However, make sure not to blow compressed air into the check valve unit of the carburetor equipped with primer pump . (2) Check the gaskets for any deformation and/or damage .

  • Page 62: Recoil Starter

    12. RECOIL STARTER 12-1 RECOIL STARTER Tools required: Screwdriver, pliers and protective glasses CAUTION Put on the protective glasses prior to start disassembly. 12-1-1 DISASSEMBLY PROCEDURE (1) Release the reel spring power -1 Hold the starter knob and pull out the starter rope .
  • Page 63 (2) Remove the components . (Fig . 12-3) SET SCREW -1 Grip the case and loosen the set screw . RATCHET -2 Take out the set screw, the ratchet guide, the GUIDE friction spring and the ratchet in that order . FRICTION SPRING (3) Remove the reel .
  • Page 64 (2) Mount the components -1 Mount the ratchet into the reel . (Fig . 12-6) THE RATCHET SHOULD BE IN THE CLOSED POSITION Fig .12-6 -2 Mount the ratchet guide assembly, taking Set screw care not to move the ratchet . (Fig .12-7) Ratchet guide Friction spring...
  • Page 65 (5) Install the rope NOTE: This procedure requires 2 people . -1 Pass the rope end through the rope guide and Approx. 200mm FROM THE REEL the rope hole of the reel and pull through approximately 20 cm out of the reel . (Fig .
  • Page 66 12-1-3 CHECKING THE RECOIL STARTER AFTER REASSEMBLY (1) Pull the starter knob about 2-3 times . (a) If the starter knob is too heavy to pull, check that each parts have been assembled as specified . (b) If the ratchet does not work, check for missing parts such as the friction spring . (2) Pull out the starter knob as far as it will go .

  • Page 67: Installation

    13. INSTALLATION Installation has a decisive influence on engine life, ease of maintenance and inspection, frequency of inspection and repair, running costs and other related aspects . Before installing the engine, be sure to plan the installation with care, taking the points below into account . 13-1 INSTALLING When installing the engine, pay special attention to the position of installation, the method for coupling with working equipment, and the foundations and supports for the engine .
  • Page 68 13-5 POWER TRANSMISSION TO DRIVE MACHINES Clutch fitting onto PTO shoulder For proper clutch fitting onto PTO shoulder, make round chamfer at clutch corner . Sharp edge of clutch corner strikes PTO shoulder . In this improper condition, bolt will be loosened, and PTO damaged finally .

  • Page 69: Troubleshooting

    14.TROUBLESHOOTING If the engine shows any sign of malfunction, the cause should be determined immediately and appropriate countermeasures should be taken to prevent the problem from worsening . This section describes certain known problems, their possible causes and appropriate countermeasures . Note, however, that the list of problems presented here is not all .
  • Page 70 Problem and possible cause Remedy 1 . Insufficient compression 1) Loosen spark plug Retighten; replace gasket 2) Leakage from cylinder head gasket Retighten; replace gasket 3) Piston ring seizure or wear Replace 4) Piston or cylinder wear Repair or replace 5) Incorrect valve and seat contact Repair or replace 6) Valve stem seizure...
  • Page 71 Problem and possible cause Remedy 1 . Oil leakage 1) Loose oil drain plug Tighten 2) Faulty oil drain gasket Replace 3) Loose main bearing cover bolts Tighten 4) Faulty main bearing cover gasket Replace Replace 5) Crankshaft oil seal (front, rear) defect 2 .

  • Page 72: Standard Repair Tables

    15. STANDARD REPAIR TABLES “STD” in the following table is the parts dimension from the brand new engine or the spare parts . Whereas, “Limit” shows the maximum allowance for the parts to be used on the engine . If the measurement exceeds beyond the “Limit”, the part needs to be replaced and/or repaired . 15-1 STANDARD DIMENSIONS AND LIMITS OF USE Unit: mm (in .) ITEM...
  • Page 73 Unit: mm (in .) ITEM Limit CYLINDER * Inner diameter To be rebored when the 60 .02 - 60 .04 difference between max . Standard (2 .3630 - 2 .3638) and min . of diameter reached to 0 .1 (0 .004) . 60 .27 - 60 .29 First reboring Ditto...
  • Page 74 Unit: mm (in .) ITEM Limit PISTON * Ring groove side clearance 0 .035 - 0 .080 0 .15 (0 .0014 - 0 .0032) (0 .0059) Oil ring 0 .030 - 0 .125 (three-piece) (0 .0012 - 0 .0049) * Piston pin hole 11 .991 - 12 .009 12 .035 (0 .4721 - 0 .4728)
  • Page 75 Unit: mm (in .) ITEM Limit CONNECTING ROD * Large end inner diameter 24 .000 - 24 .013 24 .1 (0 .9449 - 0 .9454) (0 .9488) * Clearance between large end and crank pin 0 .020 - 0 .046 0 .2 (0 .0008 - 0 .0018) (0 .0079)
  • Page 76 Unit: mm (in .) ITEM Limit CAMSHAFT * Cam peak height (intake and exhaust) 20 .228 - 20 .328 20 .201 Cam peak height (0 .7964 - 0 .8003) (0 .7953) Cam inner diameter 9 .040 - 9 .062 9 .085 (0 .3559 - 0 .357) (0 .3577) * Cam sprocket inner diameter...

  • Page 77: Service Data (The Following Are Only For Your Reference.)

    Unit: mm (in .) ITEM Limit VALVE SPRING FREE LENGTH 27 .4 (1 .0787) VALVE SEAT ANGLE (INTAKE AND EXHAUST) * Valve cutter angle (a) * Valve contact width (b) a: 90° Intake b: 0 .7 - 1 .0 2 .0 Exhaust (0 .0276 - 0 .0394) (0 .0787)

  • Page 78: Tightening Torque

    15-3 TIGHTENING TORQUE Tightening Torque Description N ・ m kgf ・ cm ft ・ lb Oil drain bolt 11 - 13 110 - 130 8 .0 - 9 .4 Connectiong rod cap bolts 6 - 8 60 - 80 4 .3 - 5 .8 Cylinder head bolts 20 - 24 200 - 240...

  • Page 79: Maintenance And Storage

    16.MAINTENANCE AND STORAGE The maintenance jobs described below apply to correct use of the engine under normal conditions . The maintenance intervals mentioned in this section are not a guarantee that no maintenance is required during those intervals . For example, when the engine is used in dusty conditions, the air cleaner should be cleaned every day, rather than every 100 hours .
  • Page 80 16-5 INSPECTION AND MAINTENANCE EVERY 300 HOURS MAINTENACE ITEMS REASON / REMARKS (1) Inspect the intake and exhaust valve clearance . (1) Incorrect clearance can cause low power output Adjust if necessary . and engine malfunction . (2) Replace oil filter . (2) Insufficient oil causes engine failure .
  • Page 84 ISSUE EMD-ES7259 PRINTED IN JAPAN September 2011...

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