Page 1: ...SERVICE MANUAL IVIodel EH18V OHV 396S322...
Page 2: ...21 EH25 EH30 EH30V EH34 EH34V EH43V EC13V DY23 DY27 DY30 DY35 DY41 WISCONSIN ROBIN SIDEVALVE W1 080 W1 145 W1 145V W1 185 W1 185V W1 230 W 1 280 W1 340 W 1 390 Wl 45OV EY21W EY44W EY18 3W EY25W EY27W...
Page 3: ...1 4 12 4 13 4 14 4 15 5 DISASSEMBLY AND REASSEMBLY 11 11 11 12 27 5 5 Break in Operation 40 41 6 1 Flywheel Magneto 41 41 5 1 PreparationsandSuggestions 5 2 SpecialTools 5 3 Disassembly Procedures 5 4...
Page 4: ...on 11 3 ExhaustGas Discharge 54 54 54 54 12 SERVICE DATA 55 55 12 1 Clearance Data andLimits 12 2 Torque Specifications 61 12 3 Oil Grade Chart 61 13 MAINTENANCE AND STORAGE 62 13 1 Daily Maintenance...
Page 5: ...nterclockwise As Viewd FromPTO Shaft Side Lubrication HorizontalDraft Type Carburetor Automobile Oil SAE 20 30or 1OW 30 Lubricant Oil Pump Type Fuel I Automobile Gasoline Fuel Feed Gravity Type Govern...
Page 6: ...vingpartsareproperlywornin Therefore anewenginemaynotproducethemaximumoutputinthebeginningbecausethemoving parts are not in a properly worn in condition 2 2 MAXIMUMTORQUE The maximum torque indicates...
Page 7: ...not have the shroud or combined fuel tank resulting in more power from less fuel and prolonged engine life flow much easier in the designof power equipment operation fuel tank incoroprated into it 4...
Page 8: ...N Theconnectingrod is aforgedaluminumalloy and its large and small ends function as bearings The piston is an aluminum alloy casting and 4 5 CAMSHAFT Thecamshaft is a hollowshaped and made of specialc...
Page 9: ...optimum cooling See Fig 4 6 EXHAUST V i Fig 4 6 4 7 CYLINDER HEAD Thecylinderhead isanaluminumdiecasting which utilizes wedge type combustion chamber for the highest combustion efficiency See Fig 4 7...
Page 10: ...r The cylinder baffle helps the cooling air flow efficiently 4 10 LUBRICATION EH18V has a trochoid pump outside the main bearing cover that is driven by the camshaft EH18V uses forced splash type lubr...
Page 11: ...heenginesareequippedwithahorizontaldraft carburetor that hasafloatcontrolled fuel system and a fixed main jet Thecarburetorsarecalibratedcarefullyforthe sure starting good acceleration low fuel con su...
Page 12: ...decompression mechanism which opens exhaust valve before the piston reaches compression top is assembled on the camshaft for easy starting See Fig 4 13 For details refer to page 41 section 7 AUTOMATI...
Page 13: ...4 15 SECTIONAL VIEW OF ENGINE RECOIL STARTER BLOWER HOUSING I MAIN BEARING COVER CRANKSHAFT 9...
Page 14: ...SPARK PLUG MUFFLER CONNECTING ROD 10...
Page 15: ...oxes ready to keep disassembled parts by group To prevent missing and misplacing temporarily assemble each groupof disassembled parts Carefully handle disassembled parts and clean them with oil if nec...
Page 16: ...ch IIOil drain oil 14mm box wrench 2 Remove oil drain plug and drain oil filter and 1 Remove oil gauge 3 Remove oil filter bracket 4 Remove oil filter bracket lOmm box wrench M6X 12mm bolt 2pcs OILGAU...
Page 17: ...ine M6X8mm bolt 0 4pcs 1 Removefuel tank 2 Remove fuel pipe from the fuel tank 3 Remove side guard M6X 12mm bolt Zpcs 4 Remove bracket fuel tank M6X 14mm bolt lpce 5 Remove cover stop switch M6X 12mm...
Page 18: ...M6X 12mm bolt lpce 6 Remove bracket N C cover M6X 14mm bolt 1pce M6x 14mm tappingbolt lpce 2 Removebreatherhosefromcleaner base 3 Remove air cleaner base from air cleaner 4 Remove cleaner base and ga...
Page 19: ...5 Air cleaner cover and engine shroud with fuel tank L M6 X 1 Remove air cleaner cover and element M6 wing bolt 9 0 1pce 2 Remove fuel pipe from the fuel tank engine shroud 3 Remove engine shroud M6X...
Page 20: ...atherhosefromcleanerbase and crankcase 3 Remove air cleaner base from air cleaner bracket M6X12mm bolt lpce cleaner from carburetor M6 nut 2pcs M6X12mm bolt lpce 4 Remove cleaner base and gasket air 5...
Page 21: ...nor lever M6X 12mm bolt 2pcs 2 Remove choke rod from speed control assembly thenremovechoke rod from choke shaft of the carburetor lOmm box wrench 1 Remove governor lever from the governor lOmm box wr...
Page 22: ...or from stud bolts I Remove muffler cover frommuffler M5X lOmm tapping screw 3pcs 2 Remove muffler and gasket muffler M8X70rnm bolt andwasherassy M8X 16mm bolt andwasherassy Zpcs lpce Remarks M5 x 10m...
Page 23: ...iller bracket M6X 12mm bolt Ipce Blower hausing Remove the blower housing from the crankcase M6x 12mm bolt 2pcs M6X 14mm bolt lpce Ignition coil 1 Disconnectstopswitchwire from stop switch M6X 30mm bo...
Page 24: ...arks Tool Flywheel 1 Remove starterpully from flywheel MI4 nut Ipce See Fig 5 1 1 2 Remove flywheel from crankshaft 3 Remove key from crankshaft 18mm box wrench driver e M14 NUT lpce STARTER PULLEY Fl...
Page 25: ...Step TooI Remarks Procedures Part to remove 15 lOmm box wrench 1 Remove brake assy Brake assy M6X 12mm bolt 4pcs BRAKE ASSY M6 x 12mm BOLT 4pcs Fig 5 13 21...
Page 26: ...pcs screw M8 lock nut 2pcs to the flywheel side remove rocker arms See Fig 5 15 4 Remove push rods 5 Remove cylinder head and gasket 2 Loosen lock nut for rocker arm adjusting 3 Slide off rocker arm s...
Page 27: ...ng See Fig 5 16 2 Remove intake andexhaustvalves from cylinder head Clean carbon and gum deposits from the valves valve seats ports and guides Inspect valves valve seats and guides 1 Remove breather c...
Page 28: ...lose spacer for lOmm box wrench cover See Fig 5 18 crankshaft M6X30mm bolt and washer assy e 8 s Oil pump 1 Removeoil pumpcoverfrom main bearing cover M6X 12mm bolt 4pcs Outer 2 Remove oil pump Inner...
Page 29: ...crankcase 2 Remove tappets from crankcase Remarks Tool To prevent the tappets from getting damages put the crankcase cylinder side down See Fig 5 20 Tappet must be installed in their original positio...
Page 30: ...out connecting rod and piston assembly through top of cylinder 3 Remove clips and piston pin to remove connecting rod from piston 4 Remove piston rings from piston Scrape off all carbon deposits that...
Page 31: ...the gaskets with new ones 5 Replace keys pins bolts nuts etc if necessary 6 Torque bolts and nuts to specification referring to page59 12 2 TORQUE SPECIFICATIONS 7 Apply oil to rotating and sliding po...
Page 32: ...d into correct groove Use care not to distort ring See Fig 5 26 5 4 3 PISTONANDCONNECTINGROD Install piston on connection rod Oil the small end of connecting rod before instal ling piston and piston p...
Page 33: ...crankshaft to bottom dead center then tap lightlytop of thepistonuntillargeend of the connecting rod meets crankpin 4 Install connecting rod cap with the match mark on themainbearingcoverside Matchthi...
Page 34: ...te bearing surfacesof camshaft Push in fully to avoid damage during camshaft installation Aligntimingmark on crankshaftgearwithtimingmark on camshaftandinstallcamshaft in the crankcase See Fig 5 31 r...
Page 35: ...1 Measure the depth Al From the mating surface to the inner raceof the ball bearing 2 Measure the height Bl From the mating to the crank gear A1 0 3 Bl SIDE CLEARANCE mm SIDE CLEARANCE 0 2 THICKNESS...
Page 36: ...hold thegasket in place Placespacerschosen atprocedure5 4 6 on crankshaft Use an oil sealguidewheninstallingthe main bearing cover to avoid damaging the seal Tap the cover into place with a soft ham m...
Page 37: ...retainer See Fig 5 35 4 Valve guides should be replaced when the valve stem clearance exceeds specifications See SERVICE DATA page 57 Drawthevalveguidesoutandpressthenew guides in Refer to SERVICE DA...
Page 38: ...etopdeadcentermay be obtained by placing the key slot on the power takeoff shaft to 45 from the center of cylinder Fig 5 37 2 Loosen thelocknut on therockerarmandturn the adjusting screw to adjust the...
Page 39: ...nkshaftandthefly wheel center hole 2 Pull the brake lever 31Install the flywheel to crankshaft Tighten the flywheel nut with the starter pulley See Fig 5 39 I Tightening torque I 59 63 Nom 600 650 kgo...
Page 40: ...DER BAFFLE Install cylinder baffle M6 X 8 m m bolt 1pce 54 17 OIL FILLER Install oil filler to the engine M6 X 12 m m bolt 1pce 5 4 18 CARBURETOR Install the gaskets insulator and carburetor ENGINESID...
Page 41: ...t Carburetor throttleopeningandgov ernorregulation thegovernorlevermustbepro perly adjusted 1 Installthrottlelever controllinkageongov ernor lever and choke shaft control rod in choke lever 2 Hook spr...
Page 42: ...ver stop switch M6 X 12m m bolt 2pcs M6 X 12mm bolt 2pcs M6 X 12m m bolt 2pcs 5 4 23 RECOIL STARTER AND ENGINE SHROUD 1 Install recoil starter and engine shroud 2 Connect fueI pipe between fuel cock a...
Page 43: ...oad 2 In order to fix the position of the speed control lever insert a philips screw driver into the hole A of 3 Loosen the adjusting screw on the speed control lever 4 Check the engine speed by a tac...
Page 44: ...ingclearancesbetweenthevariouspartscanonlybeestablished by operating the engine under reduced speed and loadsfor a short periodof time While the engineis being tested check foroil leaks Make final car...
Page 45: ...ontrol circuitfor the lower engine speed is activated and lets the currentb flow through the base terminal of the power transistor This generates the collector currentL which will bypass the current11...
Page 46: ...ELECTRONIC ADVANCING FLYWHEEL B T D C MAGNETO SYSTEM 23 4 I F 1 STEP ADVANCING 15 1 I 500 1000 2000 3000 r p m ENGINE REVOLUTION Fig 6 2 6 3 WIRINGDIAGRAM STANDARD Stop switch Flywheel Fig 6 3 42...
Page 47: ...uts out from the exhaust cam The exhaust tappet rides over the crescent cam opening the exhaust valve to release compression CRESCENT CAM EXHAUST CAM LEVER Fig 7 1 a When the crank speed reaches a cer...
Page 48: ...maintains a constant fuel level during engine opera tion The fuel flows from the fuel tank into the float chamberthroughneedlevalve Whenthefuelrises toaspecificlevel thefloatrises andwhenits buoyancy...
Page 49: ...ive pressure applied to the main nozzle increases and draws much fuel according1y thus easily start up the engine 8 2DISASSEMBLYANDREASSEMBLY Apart from mechanical failures most of carburetor troubles...
Page 50: ...function 8 2 5 FLOAT SYSTEM 1 Pull out the floatpin 8 and remove the float 7 and needle valve 6 When cIeaning the jets use neither a drill nora wire because of possible damage to the orifice which wil...
Page 51: ...neupnotch on reelwithoutlet hole for starter rope Hold reel with thumb and pull starter rope inside the starter case with screw driver See Fig 9 1 or 9 2 Rewind reel clockwise until the rotation stops...
Page 52: ...e it as shown inFig 9 4 Tietherope tightly for the safety sake Puttheoppositeside of theropethroughthe starter case and reel Tie it in the same way as the starter knob end and put the knot in the reel...
Page 53: ...the ratchet springs toward the center of the recoil Install the friction plate with its two bosses set inside of the bent portionof ratchets Apply small amount of lock tight to the center screw and to...
Page 54: ...er to the engine 7 If the spring escapes from the reel when disassembling the recoil hook the outer end of the spring onto the notch of the reel and rewind the spring into the housing 8 Lubricate the...
Page 55: ...ases by lightly tapping the float chamber with the grip of a screwdriver or the like 6 If the carburetor overflows excessive fuel runs into the cylinder when starting the engine making the fuel air mi...
Page 56: ...i e gasoline evaporating in the fuel lines due to overheat around the engine 3 Vapor lock in the fuel lines or carburetor due to the use of too volatile winter gas in the hot season 4 Air vent holein...
Page 57: ...ylinder head 4 Spark timing incorrect 5 Loose connectingrod bearing due to wear 6 Loose piston pin due to wear 7 Engine overheated 10 6 ENGINEBACKFIRESTHROUGHCARBURETOR 1 Water or dirt in gasoline or...
Page 58: ...e the engine is operated under a hood or in a small room temperature risein the engine room cancausevaporlock oildeterioration increasedoilconsumption loss of power pistonseizure shorter engine life e...
Page 59: ...the parts to be used on the engine If the measurement exceeds beyond the Limit the part needsto be replaced and or repaired 12 1 CLEARANCE DATA AND LIMITS Unit rnm in CYLINDER HEAD 0 Valve seat contac...
Page 60: ...S 2nd 01s T STD 67 000 67 019 2 6378 2 6385 67 250 67 269 2 6476 2 6484 67 500 67 519 2 6575 2 6582 LESS THAN 0 01 0 004 LESS THAN 0 015 0 0006 66 96 66 98 2 6362 2 6370 67 21 67 23 2 6461 2 6469 67...
Page 61: ...ap TOP 2nd Oil ring TOP 2nd oil ring T Uni mm in STD Limit I 0 050 0 095 0 001 9 0 0037 0 006 0 040 0 085 0 001 6 0 0030 0 006 0 0 035 0 0 001 4 13 991 14 002 0 5508 0 5513 13 992 14 000 0 5508 0 551...
Page 62: ...end and piston pin 0 Big end side clearance CRANKSHAFT 0 Journal dia STD 26 000 26 013 1 0236 1 0241 0 037 0 063 0 0015 0 0024 14 010 14 021 0 5516 0 5520 0 010 0 029 0 0004 0 0011 0 1 0 3 0 0039 0 01...
Page 63: ...95 0 6673 14 973 14 984 0 5895 0 5899 14 95 0 5886 D2 VALVE 0 Valve stem outsidedia 5 440 5 455 0 2142 0 21 48 5 35 0 21 06 IN 5 426 5 444 0 2136 0 21 43 5 35 0 2106 EX 0 Clearance between valve stem...
Page 64: ...e ROCKERARM 0 Rocker shaft outside dia 0 Rocker arm shaft clearance VALVE SPRING FREE LENGTH STD 7 960 7 975 0 31 34 0 3140 8 000 8 01 5 0 31 50 0 3156 0 025 0 055 0 0010 0 0022 11 995 12 000 0 4722 0...
Page 65: ...7 7 2 7 8 9 8 80 100 Main bearing cover bolts 43 47 58 8 63 7 600 650 New spark plug 16 6 19 5 22 6 26 5 230 270 Retightening 8 7 10 9 11 8 14 7 120 150 Spark plug 12 3 OIL GRADE CHART Single Lubrican...
Page 66: ...any retighten fasteners or replace necessary parts Read instructionfor use 3 Inspect for loose hardware and Read instructionfor Loose bolts and nuts may come off and retightenif necessary use result i...
Page 67: ...er I 4 Adjust valve clearance I Consultyournearest Robin dearer I 5 Replace spark plug Consult your nearest Robin dearer 6 Overhaul engine Consultyournearest Robin dearer I 13 6 EVERY 1000 HOURS YEARL...
Page 68: ...Industrial Engines...
