Subaru EH72-2D Service Information
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Subaru EH72-2D Service Information

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SERVICE INFORMATION

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  • Page 1 SERVICE INFORMATION...

  • Page 3: Table Of Contents

    PREFACE This.manual.covers.the.service.information,.trouble.shooting.procedures.and.so.on.of.. EH72-2.engine . Careful.observance.of.the.instructions.given.herein.will.result.in.better,.safer.and.faster. service.work . For.more.detailed.instructions.of.disassembling.and.reassembling.procedures,.please.. refer.to.the.service.manual.for.EH63,.64,.65.and.72 . CONTENTS Section Title Page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 1.

  • Page 4: Specifications

    1. SPECIFICATIONS Model EH72-2D Air-Cooled,.4-Stroke,.V-Twin.Cylinder,.Horizontal.P .T .O ..shaft,.. Type OHV.Gasoline.Engine Number of Cylinders - Bore×Stroke mm (in.) 2.-.84.×.65.(3 .31.×.2 .56) Displacement ml (cu.in.) 720.(43 .9) Compression Ratio 8 .7 Continuous Output kW(HP)/r.p.m. 14 .2.(19 .0)./.3600 Maximum Output kW(HP)/r.p.m. Gross.:.18 .7.(25 .0)./.3600 Maximum Torque m / r.p.m.

  • Page 5: Features

    2. FEATURES HIGH OUTPUT, TORQUE AND DURABILITY 720cc.displacement.which.is.the.largest.among.25.horsepower.classed.engines,.produces.high. torque.from.the.low.speed.range ..High.durability.with.less.than.1%.horsepower.drop.after.300. hours.of.full-throttle.operation . Furthermore,.the.new.generation.of.EH72.(EH72-2).has.achieved.higher.output.by.adopting.. 2-.Barrel.Side.draft.carburetor.system,.which.increases.intake.airflow.and.optimally.distributes.. air-fuel.to.each.cylinder,.as.well.as.optimizing.camshaft.profile.and.increasing.compression.ratio . INTAKE MANIFOLD HEAVY DUTY CONSTRUCTON Reliable.structure.with.pressure.lubrication,.cast.iron.cylinder.sleeve.and.dual.air.cleaner.element .. Also,.heavy.duty.ball.bearing.installed.on.P .T .O ..side . SUPERIOR OIL CONTROL In.addition.to.the.excellent.oil.control.by.3.pieces.oil.rings,.adoption.of.valve.stem.seal.and.high. cooling.capability.reduce.oil.consumption ..This.enables.longer.oil.maintenance.interval.together. with.largest.lubrication.oil.capacity.in.this.class . -.2.-...

  • Page 6: Disassembly And Reassembly

    3. DISASSEMBLY AND REASSEMBLY 3-1 PREPARATIONS AND SUGGESTIONS (1).. W hen.disassembling.the.engine,.memorize.the.locations.of.individual.parts.so.that.they.can. be.reassembled.correctly ..If.you.are.uncertain.of.identifying.some.parts,.it.is.suggested.that. tags.be.attached.to.them . (2).. H ave.boxes.ready.to.keep.disassembled.parts.by.group . (3).. T o.prevent.losing.and.misplacing,.temporarily.assemble.each.group.of.disassembled.parts . (4).. C arefully.handle.disassembled.parts,.and.clean.them.with.washing.oil.if.necessary . (5).. U se.the.correct.tools.in.the.correct.way . (6).. W hen.disconnecting.electric.wirings,.be.sure.to.hold.and.disconnect.the.connector.housing . 3-2 SPECIAL TOOLS No.Special.Tool.is.needed.for.disassembling.and.reassembling.the.engine . For.pulling.off.the.flywheel,.universal.type.puller.being.popular.in.the.market.place.as.shown.in.

  • Page 7: 3-3

    3-3 DISASSEMBLY PROCEDURES (DIFFERENCE) Step Parts to remove Remarks and procedures Parts Fasteners (1) Disconnect the choke rod holder and remove Chock.control. lever.and.link the choke control rod. (See Fig. 3-1) (2) Remove the choke knob. CONTROL BOX LINK PIVOT BLOWER HOUSING CHOKE CONTROL ROD M5 TAPPING...
  • Page 8 Step Parts to remove Remarks and procedures Parts Fasteners Carburetor (1).. A t.first.remove.fuel.pipe ..(See.Fig .3-2). (2).. R emove.the.governor.rod.spring.from.rod.holder .. (3).. P ick.up.the.rod.holder.and.remove.the.governor.rod . (See.Fig .3-3) (4).. R emove.the.nuts,.adapter.and.Carburetor.from.the. M6.Flange.nut.:.4pcs . intake.manifold ..(See.Fig .3-4) ROD HOLDER Turn the rod holder clockwise to loosen. GOVERNOR ROD VIEW FUEL PIPE...

  • Page 9: 3-4

    3-4 REASSEMBLY PROCEDURES (DIFFERENCE) 22) CARBURETOR CARBURETOR GASKET Set.gasket.onto.intake.manifold.and.install. (ADAPTER) carburetor . GASKET M6.Flange.nut.:.4pcs . (CARBURETOR) Tightening torque 16 .6.-.18 .6.N•m (170.-.190.kgf•cm) (12 .3.-.13 .7.ft•lb .) #2 CYLINDER SIDE CLEANER GASKET (ADAPTER) GASKET (CARBURETOR) ADAPTER GROMMT (PLUG CAP) #2 CYLINDER SIDE ONLY SPARK PLUG CAP The marking down wards.
  • Page 10 24) GOVERNOR LEVER THROTTLE LEVER CLEANER ADAPTER Attach.governor.rod.and.rod.spring.between. GOVERNOR SHAFT governor.lever.and.carburetor.throttle.lever,. and.insert..the.governor.lever.to.governor. GOVERNOR lever.shaft ..Tighten.locking.bolt.temporarily . LEVER Turn the rod holder counter clockwise SPRING and fix it. Then hook the rod spring as shown GOVERNOR on the diagram. ROD SPRING ROD HOLDER GOVERNOR ROD ROD HOLDER...

  • Page 11: 3-5.Break-In.operation

    29) AIR CLEANER and BREATHER PIPE CLEANER BASE CP (1).Connect.breather.pipe.to.air.cleaner.base .. (2).. S et.gasket.onto.cleaner.adapter.and.install. cleaner.base . (3).Fit.air.cleaner.base.onto.carburetor .. M6.x.12.Flange.bolt.:.3.pcs . Tightening torque 6 .8.-.8 .8.N•m GASKET (70.-.90.kgf•cm) (CLEANER) (5 .0.-.6 .5.ft•lb .) (4).Connect.breather.pipe.to.#1.cylinder.head .. CLEANER ADAPTER (5).. S et.air.cleaner.element.along.with.urethane. foam.onto.base .. (6).Install.air.cleaner.cover.with.knob .

  • Page 12: 4-1.Carburetor

    4-1 CARBURETOR OPERATION AND FUNCTION [EH72-2] Main System FUEL NIPPLE SCREW, THROTTLE ADJUST FUEL SLOW JET MIXTURE FLOAT JET COML, MAIN(L) JET COML, MAIN(R) FUEL VALVE COMPL, DRAIN SOLENOID MIXTURE Slow System FUEL MIXTURE VALVE, THROTTLE VALVE, CHOKE FUEL MIXTURE -.9.-...
  • Page 13 FLOAT SYSTEM The.float.system.is.consists.of.a.float.and.a.needle.valve,.and.maintains.a.constant.fuel.level. during.engine.operation .. The.fuel.flows.from.the.fuel.tank.into.the.float.chamber.through.needle.valve .. When.the.fuel.rises.to.a.specific.level,.the.float.rises,.and.when.its.buoyancy.and.fuel.pressure.are. balanced,.the.needle.valve.closes.to.shut.off.the.fuel,.thereby.keeping.the.fuel.at.the.predetermined.level .. Air.vent.hole.of.float.chamber.is.provided.around.the.carburetor.air.hone.and.the.fuel.vapor.is. sucked.into.the.combustion.chamber ..This.closed.system.has.unti-dust.feature . 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 . The.fuel-air.mixture.is.fed.to.the.engine.through.the.pilot.outlet.and.the.by-pass . At.idling.speed,.the.fuel.is.mainly.fed.from.the.pilot.outlet .. MAIN SYSTEM The.main.system.feeds.the.fuel.to.the.engine.at.medium-and.high-speed.operation . The.fuel.is.metered.by.the.main.jet.and.fed.to.the.main.nozzle ..The.air.metered.by.the.main. air.jet.is.mixed.with.the.fuel.through.the.emulsion.tube,.and.the.mixture.is.atomized.out.of.the. main.bore ..It.is.mixed.again.with.the.air.taken.through.the.air.cleaner.into.an.optimum.fuel-air. mixture,.which.is.supplied.to.the.engine .. CHOKE The.choke.is.used.for.easy.start.when.engine.is.cold . When.the.starter.is.operated.with.a.choke.valve.fully.closed,.the.negative.pressure.applied.to. the.main.nozzle.increases.and.draws.much.fuel.accordingly;.thus.easily.start.up.the.engine ..

  • Page 14: 4-2.Compornent.parts

    4-2 COMPORNENT PARTS 2 (With locktight) (With locktight) (TIGHTENING TORQUE 1.5~2.5N•m) ..1 .VALVE,THROTTLE 11 .SCREW,.DRAIN 21 .GASKET(MATERIAL.:.ALUMINUM) ..2 .SCREW.SET(VALVE) 12 .SPRING,.DRAIN 22 .O-RING ..3 .VALVE,.CHOKE 13 .SCREW,.THROTTLE.ADJUST 23 .GASKET,.SPACER ..4 .SHAFT.ASSY,CHOKE 14 .SPRING(ADJUST.SCREW) 24 .SPACER,.CARB ..5 .SHAFT.COMPL,THROTTLE 15 .SCREW 25 .O-RING ..6 .VALVE,.FLOAT 16 .COLLAR,.CHOKE 26 .COVER,.SLOW.PASSAGE...
  • Page 16 ISSUE EMD-EU6947 PRINTED IN JAPAN February 2010...

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