Robin America EX30 Service Manual
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Robin America EX30 Service Manual

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SERVICE
MANUAL
Model
EX30
ENGINES
PUB-ES2268
Rev. 10/06

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  • Page 1 SERVICE MANUAL Model EX30 ENGINES PUB-ES2268 Rev. 10/06...
  • Page 2 940 Lively Blvd. • Wood Dale, IL 60191 • Phone: 630-350-8200 • Fax: 630-350-8212 e-mail: sales@robinamerica.com • www.robinamerica.com © Copyright 2006 Robin America, Inc.

  • Page 3: Table Of Contents

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

  • Page 4: Specifications

    1. SPECIFICATIONS MODEL EX30D Type Air-cooled, 4-cycle single cylinder, overhead camshaft, gasoline engine Displacement mL (cc) Direction of Rotation Counterclockwise, as Viewed from P.T.O. Shaft side Lubricant Automotive detergent oil (API/ SE or higher grade, SAE/ 10W-30 etc.) Oil Capacity Liter Fuel Automotive Gasoline (Unleaded)

  • Page 5: 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 6: Performance Curves

    2-4 PERFORMANCE CURVES 20.0 19.0 18.0 MAXIMUM TORQUE 17.0 [HP] 10.0 MAXIMUM HORSEPOWER CONTINUOUS RATED HP RECOMMENDED HORSEPOWER RANGE 2000 2400 2800 3200 3600 4000 REVOLUTION r.p.m. - 3 -...

  • Page 7: Features

    3. FEATURES 3-1 EXTREMELY EASY START - NO KICK-BACK Reliable Starting and Less Pulling Force are achieved by: - Sophisticated Mechanical Compression Release System as well as newly designed Combustion Chamber. - EX engines start instantly even at minus (-) 10°C, without any perceptible kick-back. 3-2 EXTREMELY EASY MAINTENANCE Extreme ease of maintenance is realized by: - Only with ordinary tools, routine maintenance, assembly and disassembly can be performed.

  • Page 8: 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 9: Cylinder Head

    4-5 PISTON RINGS The piston rings are made of special cast iron. The profi le of the top ring is a barrel face or tapered face, and that of the second ring is a tapered face. There are 2 types of oil ring depending on the engine specifi cation. As those are interchangeable, the cutter ring with coil expander type can be selected as the spare part.
  • Page 10 ※ Model EX30 has a smooth advanced ignition timing system to improve starting performance. (For further details, refer to page 43, section "7.
  • Page 11 4-14 CARBURETOR The engine is equipped with a horizontal draft carburetor. The carburetor setting is calibrated after careful testing for optimum all-round performance (including starting, acceleration, fuel consumption, output power characteristics). Special attention is also paid to the general-purpose use of the engine. (For further information, refer to page 51, section "12.
  • Page 12 4-17 SECTIONAL VIEW OF THE ENGINE Cross sectional view - across the shaft DUCT BLOWER HOUSING GOVERNOR SHAFT GOVERNOR LEVER GOVERNOR GEAR CRANKSHAFT CONNECTING ROD STARTING PULLEY RECOIL STARTER FLYWHEEL OIL SENSOR MAIN BEARING COVER - 9 -...
  • Page 13 Cross sectional view - along the shaft EXHAUST VALVE GOVERNOR LEVER PISTON EXHAUST PIPE DUCT CHAIN GUIDE GOVERNOR ROCKER GEAR INTAKE VALVE CAMSHAFT PISTON PIN TIMING CHAIN PISTON RING TENSIONER OIL GAUGE OIL DRAIN PLUG CONNECTING ROD OIL SENSOR CRANKSHAFT CRANKCASE - 10 -...

  • Page 14: 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 identifi cation tags with the required assembly information to the parts. (2) Store groups of parts in separate boxes.

  • Page 15: Disassembly Procedure

    5-3 DISASSEMBLY PROCEDURE Step Parts to remove Remarks and procedures Fasteners Drain the engine oil (1) Remove a drain plug (M14 x 12mm) 14 mm spanner located on both sides of the case. Take care not to lose the gaskets. (2) To discharge oil quickly, remove the oil guage.
  • Page 16 Step Parts to remove Remarks and procedures Fasteners Air cleaner cover Remove the air cleaner cover. 14 mm spanner Air cleaner Remove the element, and remove the air cleaner 10 mm box spanner while pulling the breather pipe away from the rocker M6 nut : 2 pcs.
  • Page 17 Step Parts to remove Remarks and procedures Fasteners Stop switch Disconnect the wire and remove the stop switch from (Float C/U CP5) the blower housing. Recoil starter Remove the recoil starter from the blower housing. 10 mm box spanner M6 x 14mm : 4 pcs. Blower housing (1)Remove the blower housing from the crankcase.
  • Page 18 Step Parts to remove Remarks and procedures Fasteners Duct (case) Remove the Duct (case) from the crankcase. 10 mm box spanner M6 x 12mm : 3 pcs Exhaust pipe Remove the Exhaust pipe from the cylinder head. 12mm box spanner Take care not to lose the gasket.
  • Page 19 Step Parts to remove Remarks and procedures Fasteners Governor system (1) Loosen the bolt and remove the governor lever 14 mm spanner from the governor shaft. There is no need to remove the bolt. (2) Remove the governor spring. (3) Remove the governor rod and the rod spring from the carburetor.
  • Page 20 Step Parts to remove Remarks and procedures Fasteners Ignition coil Remove the spark plug cap from the spark plug and 10 mm box spanner remove the ignition coil from the crankcase. M6 x 25mm : 2 pcs. Starting pulley Wear work gloves during operation to avoid a possible 24 mm box spanner or injury by a sharp edge.
  • Page 21 Step Parts to remove Remarks and procedures Fasteners Electric starter (option) (1) Disconnect the grounding cable from battery. Control box, (2) Disconnect the wire leading from the key switch Diode rectifi er, “ST” terminal to the magnetic switch. 12 mm box spanner Magnetic switch (3) Disconnect the wire that connects the positive M8 nuts...
  • Page 22 Step Parts to remove Remarks and procedures Fasteners Baffl e 1 (case) Remove the baffl e 1 (case) M8 x 12mm : 1 pc. Charge coil (option) Remove the charge coil. box spanner (Remove the wire clamp together) M6 x 20mm : 2 pcs. + screwdriver Spark plug Remove the spark plug from the cylinder head.
  • Page 23 Step Parts to remove Remarks and procedures Fasteners Rocker cover (1) Remove the rocker cover from the cylinder head. 10 mm box spanner (2) Remove the gasket (rocker cover). M6 x 12mm : 4 pcs. Rocker arm Remove the pin (rocker arm) and the rocker arm from the cylinder head at the compression top dead center.
  • Page 24 Step Parts to remove Remarks and procedures Fasteners Main bearing cover Remove the fl ange bolts of main bearing cover from the 12 mm box spanner crankcase. M8 × 35mm : 7 pcs. Remove the main bearing cover while tapping gently around the cover using a plastic hammer or similar tool.
  • Page 25 Step Parts to remove Remarks and procedures Fasteners Tensioner, Camshaft (1) Remove the tensioner. (See Figure STEP23-A) M10 box spanner or spanner Do not lose the pin (tensioner). M6 × 12mm : 1 pc. (2) Remove the retaining bolt of pin (camshaft) from the cylinder head.
  • Page 26 Step Parts to remove Remarks and procedures Fasteners Cylinder head, (1) Remove the cylinder head from the crankcase. 12 mm box spanner Chain guide (2) Remove the cylinder head gasket from the cylinder M8 × 68mm : 4 pcs. head. Take care not to lose the pipe knocks. M8 ×...
  • Page 27 Step Parts to remove Remarks and procedures Fasteners Connecting rod and piston (1) Scrape off any carbon from the cylinder and the 10 mm box spanner piston head, then remove the connecting rod bolt. M7 × 40mm : 2 pcs. (2) Remove the connecting rod cap.
  • Page 28 Step Parts to remove Remarks and procedures Fasteners Crankshaft (1) Remove the woodruff key (for the fl ywheel 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. (See Figure STEP28-A) Oil sensor (option) (1) Remove the clamp.

  • Page 29: 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 30 (3) PISTON AND PISTON RINGS Install each piston ring in the correct groove of the piston by widening it enough to slide it over the OPEN ENDS OF PISTON RING piston. NOTE: Be careful not to twist the rings too much, as they may be damaged.
  • Page 31 (5) CONNECTING ROD (a) Install the piston and connecting rod assembly into PISTON RING GUIDE the cylinder by holding the piston rings with the CONNECTING ROD ring guide, with the "MAG" mark on the connecting rod on the fl ywheel side. (If you do not have a ring guide, hold the piston rings with the fi...
  • Page 32 (6) INTAKE AND EXHAUST VALVES Take the following points into account when mounting the intake and exhaust valves on the cylinder head. NOTE1: Replace the valve with a new one if it shows signs of wear. (Refer to the "STANDARD REPAIR TABLES" on page 71 and 72.) NOTE2: Carefully scrape off any carbon deposits on the combustion chamber.
  • Page 33 (8) CYLINDER HEAD Inspect and repair any scratches on mounting surface and replace head gasket to new one before installing. Tightening Torque STEP STEP Cylinder head bolts Remarks 25.0 - 27.0 N ● (250 - 270 kgf Re-use ● (18.1 - 19.5 ft lb.) M8 ×...
  • Page 34 (10) MOUNTING THE CAMSHAFT ON THE CYLINDER HEAD Mount the camshaft on the cylinder head by inserting the pin (camshaft) through the head. Fix the bolt to prevent the pin (camshaft) from coming out. PIN (CAMSHAFT) M6 x 12 BOLT : 1 pc. CHAIN Bolt used to prevent the pin (camshaft) from coming out...
  • Page 35 (12) MAIN BEARING COVER Apply oil to the bearing and the oil seal lip when mounting the main bearing cover. Also apply sealant (Three Bond "1215" to the surface of the crankcase. To avoid damaging the oil seal lip, wrap the crankshaft key-way portion with polyvinyl tape before mounting the main bearing cover.
  • Page 36 (13) Pass the pin (rocker arm) through the rocker arm and mount them on the cylinder head. ROCKER ARM (EXHAUST VALVE SIDE) NOTE1: Conduct this job at the compression top (ROCKER ARM) dead center. (The position of two punch marks on cam sprocket is in parallel with the cylinder head surface at a time.) Punch...

  • Page 37: Tightening Torque

    (15) ROCKER COVER Replace the gasket with a new one, and mount the SPARK PLUG rocker cover. GASKET (ROCKER COVER) M6 × 12mm fl ange bolt : 4 pcs. Tightening torque 5.0 - 7.0 N ● (50 - 70 kgf ●...
  • Page 38 (18) FLYWHEEL AND STARTING PULLEY FLYWHEEL NOTE1: Wear work gloves during operation to avoid a possible injury by a sharp edge. NOTE2: When mounting the fl ywheel, be sure to wipe off any oil on the tapered portion of the crankshaft and fl ywheel. Mount the fl...
  • Page 39 (20) SPEED CONTROL LEVER, BRACKET AND BAFFLE Mount the speed control lever and bracket, baffl e 2 (head) on the crankcase. (21) CARBURETOR (a) Replace the gasket of insulator with a new one and mount the insulator on the cylinder head intake side. (b) Align the cord of ignition coil with the cut-out in the insulator to fi...
  • Page 40 (22) GOVERNOR LEVER (a) Pass the governor rod through the rod spring, then connect to the throttle lever of the carburetor. (b) Attach the governor rod and rod spring to the governor lever, then mount the governor lever on the governor shaft.
  • Page 41 (23) EXHAUST PIPE and DUCT(CASE) DUCT (CASE) M6 x 12 BOLT : 3 pcs. Mount the Exhaust pipe and the gasket on the cylinder head. GASKET (Attention to the wrong side and right side) EXHAUST PIPE SIDE M8 NUT : 2 pcs. (RIGHT SIDE) EXHAUST PIPE GASKET...
  • Page 42 (25) AIR CLEANER BASE Insert the breather pipe into the rocker cover and M6 x 20 then mount the air cleaner base. FLANGE BOLT : 1 pc. M6 FLANGE NUT : 2 pcs. GASKET M6 fl ange nut : 2 pcs. Tightening torque 6.0 - 8.0 N ●...
  • Page 43 (26) STOP SWITCH (FLOAT C/U CP5) (a) Mount the stop switch on the blower housing. (b) Refer to the wiring diagram (See page 45 and 46) for wiring details. STOP SWITCH (27) AIR CLEANER Mount the air cleaner element and cleaner cover. CLEANER BODY COMP COVER COMP...
  • Page 44 (28) 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. (29) FILLING WITH ENGINE OIL Use the automobile engine oil of API service class SE or higher grade. The amount of oil depends on the engine model.

  • Page 45: 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) Classifi...

  • Page 46: Magneto

    7. MAGNETO 7-1 MAGNETO The Robin Engine uses a T.I.C. type breakerless magneto ignition system. (1) T.I.C. (TRANSISTOR IGNITER CIRCUIT) has the ignition coil outside the fl ywheel, which is the standard specifi cation. A charge coil system is available as an option. (The fl...

  • Page 47: Ignition System

    7-3 IGNITION SYSTEM 7-3-1 IGNITION COIL INTERNAL CIRCUIT Base Resister Low Speed Ignition Timing Control Circuit Advancing Control Circuit 7-3-2 IGNITION TIMING CHARACTERISTIC LINEAR ADVANCING 1000 1500 2000 2500 3000 3500 4000 ENGINE REVOLUTION (R.P.M.) 7-3-3 BASIC THEORY (a) Revolution of the fl ywheel generates electricity on the primary side of the ignition coil ( ① ), and the base current I fl...

  • Page 48: Wiring Diagram

    8. WIRING DIAGRAM 8-1 MODEL WITHOUT ELECTRIC STARTER Spark plug Black Ignition coil (with built-in transistor) Flywheel 8-2 MODEL WITH ELECTRIC STARTER Spark plug Black Magneto Ignition coil Key switch Charge coil Diode rectifier LA108 Battery LA408 (12V24AH) Key switch Electric starter START - 45 -...

  • Page 49: Oil Sensor

    8-3 MODEL WITH OIL SENSOR Yellow To LED Lamp Yellow / Red Oil sensor Orange Orange Black control unit sensor Black / White Body earth Black To stop switch Spark plug - 46 -...
  • Page 50 10. OIL SENSOR 10-1 SPECIFICATIONS Float type Type (with lead switch incorporated) Resistance 100 M ohms or over (at FULL oil level) OIL SENSOR Operating -30 to +180 degree Celsius Temperature 10-2 CONSTRUCTION AND OPERATION The oil sensor is composed of the fl oat, permanent magnet incorporated into the fl...

  • Page 51: Automatic Decompression System

    11. AUTOMATIC DECOMPRESSION SYSTEM 11-1 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 52: Carburetor

    12. CARBURETOR 12-1 SPECIFICATIONS A/C Type Urethane foam element Main Jet 98.0 Pilot Jet 40.0 Pilot Screw Turning 1-1/2 12-2 FUNCTIONS AND CONSTRUCTION 12-2-1 FLOAT SYSTEM The fl oat chamber is located below the carburetor body. Through the operation of the fl oat and the needle valve, the fl...

  • Page 53: Fuel System Outline

    FUEL SYSTEM OUTLINE FUEL NEEDLE VALVE FLOAT FLOAT CHAMBER PILOT OUTLET PILOT JET BYPASS PILOT AIR JET MAIN NOZZLE AIR INTAKE PORT CHOKE VALVE FLOAT MAIN AIR JET MAIN JET - 52 -...
  • Page 54 12-3 DISASSEMBLY AND REASSEMBLY Mechanical failures aside, most carburetor malfunctions occur when the fuel/air ratio of the mixture is not correct. This is usually caused by clogged jets, air passages and fuel passages, or by variations in the fuel level. To get the best possible performance from the carburetor, ensure that the each passages are kept clean so that air and fuel can fl...
  • Page 55 The procedures for overhauling the carburetor are described below. 12-3-1 THROTTLE SYSTEM (1) When the throttle stop screw is removed, the spring can be taken out. (2) Remove the phillips screw and the throttle valve , then take out the throttle shaft When removing the throttle valve, take care not to damage the valve edge.

  • Page 56: Recoil Starter

    13. RECOIL STARTER Tools to be prepared: Driver, Pinchers (Pliers), Protective Glasses and Work gloves. WARNING Before starting the disassembly, make sure to wear the protective glasses. 13-1 DISASSEMBLY STEPS (1) Relieve the spring power. -1: Hold the starter knob and extract the starter rope. -2: Extract the rope fully and hold the rope so that the knot of the rope in the reel makes a straight line with the rope guide.
  • Page 57 -2: Hold up the real gradually and slowly, and remove it from the case. -3: If the spiral spring in the reel likes to jump out of the reel, stop the procedure and push the reel against the case to redo the step of section (3)-1 and (3)-2. WARNING Since the spiral spring is set in the reel, do not drop or shake it.
  • Page 58 (4) Wind the spiral spring. -1: Hold the case tightly and rotate the reel counterclockwise until it stops. (It stops when it is wound approx. 6 turns.) -2: Turn back the reel slowly by approx. 3/4 turns and hold the reel at the position where the rope hole of the reel and the rope guide of the case are aligned.
  • Page 59 13-3 CHECK AFTER REASSEMBLY (1) Pull the starter knob a few times to check if : A. The starter knob is too heavy to pull, check that each part has been assembled as specifi ed. B. The ratchet does not function, check if parts such as friction spring have been missing. (2) Pull the starter knob and pull out the rope fully to see if: A.

  • Page 60: Installation

    14. INSTALLATION Installation has a decisive infl uence 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. 14-1 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 61: Power Transmission To Drive Machines

    14-5 POWER TRANSMISSION TO DRIVE MACHINES 14-5-1 BELT DRIVE Note the following: Use a V-belt rather than a fl at belt. ● The drive shaft of the engine must be parallel to the drive shaft of the driven machine. ● The drive pulley of the engine must be in line with the driven pulley of the machine.

  • Page 62: Troubleshooting

    15. 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 63 Problem and possible cause Remedy 1. Insuffi cient 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 64 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 5) Crankshaft oil seal (front, rear) defect Replace 2.

  • Page 65: Electric Starter

    ELECTRIC STARTER Engine does not start Check battery charged Charge or replace the battery. Does the Does the state and battery terminal Repair connection or crank run? starter run? connection or corrosion corrosion of battery terminals. for any abnormality. Key switch Connected state Check/repair wiring to the Operation sound of...
  • Page 66 Problem and check item Description Remedy (1) When no voltage is applied to the 1. Checking of Check S terminal and B terminal S terminal and B terminal, check continuity of for deformation, looseness, KEY SWITCH continuity of the terminals and wiring rusting, or dust sticking.
  • Page 67 Problem and check item Description Remedy (1) Remove and check the starter. Check engaged Motor idles and engine does not MAGNETIC SWITCH Check or replace the pinion clutch state of pinion run. CABLE if necessary. and ring gear. To KEY SWITCH (TERMINAL "ST") (2) Check battery charged state and EARTH WIRE...

  • Page 68: Standard Repair Tables

    16. 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. 16-1 STANDARD DIMENSIONS AND LIMITS OF USE Unit: mm (in.) ITEM...
  • Page 69 Unit: mm (in.) ITEM Limit CYLINDER To be rebored when the difference * Inner diameter 75.000 - 75.019 between max. and Standard min. of diameter (2.9528 - 2.9535) reached to 0.1 (0.004). 75.250 - 75.269 First Ditto reboring (2.9626 - 2.9633) 75.500 - 75.519 Second Ditto...
  • Page 70 Unit: mm (in.) ITEM Limit PISTON * Ring groove side clearance 0.035 - 0.080 0.15 (0.0014 - 0.0031) (0.0059) 0.0100 - 0.205 Oil ring (three-piece) (0.0004 - 0.0081) * Piston pin hole 17.991 - 18.009 18.035 (0.7083 - 0.7090) (0.7224) * Piston pin outer diameter 17.992 - 18.000 17.960...
  • Page 71 Unit: mm (in.) ITEM Limit CONNECTING ROD * Large end inner diameter 34.500 - 34.516 34.1 (1.3386 - 1.3392) (1.3425) * Clearance between large end and crank pin 0.020 - 0.049 (0.0008 - 0.0019) (0.0078) * Small end inner diameter 18.010 - 18.021 18.08 (0.7091 - 0.7095)
  • Page 72 Unit: mm (in.) ITEM Limit CAMSHAFT * Cam peak height (intake and exhaust) 29.431 - 29.531 29.38 Cam peak (1.1587 - 1.1626) (1.1567) height * Cam sprocket inner diameter * Pin (cam sprocket) outer diameter Cam inner 9.0 - 9.036 9.05 diameter (0.3543 - 0.3557)
  • Page 73 Unit: mm (in.) ITEM Limit VALVE SPRING FREE LENGTH 27.4 (1.0787) VALVE SEAT ANGLE (INTAKE AND EXHAUST) * Valve cutter angle (a) a: 90° Intake * Valve contact width (b) b: 0.7 - 1.0 (0.0787) Exhaust (0.0276 - 0.0394) CHAIN LENGTH 160N (16kgf.) 307.1 310.6...

  • Page 74: Tightening Torque

    16-2 TIGHTENING TORQUE Tightening Torque ITEM ● ● ● Re-use 25.0 - 27.0 250 - 270 18.1 - 19.5 M8 × 68 fl ange bolt When replace to new cylinder Cylinder head bolts 28.0 - 30.0 280 - 300 20.3 - 21.7 head and fl...

  • Page 75: Maintenance And Storage

    17. 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 76: Engine Storage

    17-5 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 and Adjust if necessary. engine malfunction. 17-6 INSPECTION AND MAINTENANCE EVERY 500 TO 600 HOURS (EVERY 6 MONTHS) MAINTENACE ITEMS REASON / REMARKS (1) Remove the cylinder head and remove any carbon.
  • Page 78 PRINTED IN THE USA...

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