Robin EY14, EY18-3,EY23, Ey25-2, EY27-2 service manual

ROBIN AMERICA, mc. ROBIN TO WISCONSIN ROBIN ENGINE MODEL CROSS REFERENCE LIST ROBIN WISCONSIN ROBIN - EY08 EYl5 EY 15V EY20 EY2OV EY23 EY28 EY35 EY40 EY45V EY2 1 EY44 EY25 EY27 EY 18-3 EHl 1 EH12 EH15 EH17 EH21 EH25 EH30 EH3OV EH34 EH34V EH43V EC13V DY23 DY27 DY30 DY35 DY4 1 W1-080 W1-145 W1-145V w1-185 W1-185V Wl-230 W 1-280 W1-340 W1-390 W1-450V EY21W EY44W EY 18-3W EY25W EY27W TWO CYCLE WOl-115 WOl-120 WO1-150 WO1-170 wo1-210 WO1-250 WO 1-300 WO 1 -300v WO 1-340 WO 1 -340V WO 1 -430V WT1-125V WRD 1-230 WRD 1-270 WRD 1-300 WRD1-350 wRDl-410

CONTENTS Section Title Page ........................................... 1 . SPECIFICATIONS 1 2 . PERFORMANCE ........................................... 2 2-1 Maximum Output ........................................ 2 2-2 Continuous Rated Output .................................. 2 2-3 MaximumTorque and Fuel Consumption Ratio at Max . Output ......... 2 3 . FEATURES ................................................ 4 4 . GENERAL DESCRIPTION of ENGINE CONSTRUCTION ............... 4 4-1 Cylinder Crankcase ...................................... 4 4-2 Main Bearing Cover ....................................... 4 4-3 Crankshaft ........................................... 4 4-5 Camshaft ............................................. 4 4-7 Cylinder Head .......................................... 5 4-8 Governor ............................................. 5 4-9 Cooling ............................................... 5 4-10 Lubrication ............................................ 5 4-11 Ignition .............................................. 5 4-13 Air Cleaner ............................................ 5 4-14 Sectional View of Engine ................................... 6 4.4 Connecting Rod and Piston ................................. 4 4-6 Valve Arrangement ....................................... 5 4-12 Carburetor ............................................ 5 5.lNSTALLATlON ............................................ 14 5-1 Installing .............................................. 14 5-2 Ventilation ............................................ 14 5-3 Exhaust Gas Evacuation .................................... 14 5-4 Fuel System ........................................... 14 5-5 Power Transmission to Driven Machines ......................... 14 5-6 Wiring ............................................. 15 6 . DISASSEMBLY and REASSEMBLY .............................. 21 6-1 Preparation and Suggestions ................................. 21 6-2 Special Tools ........................................... 21 6-3 Disassembly and Ressembly Procedures ......................... 22

7.MAGNETO ................................................ 29 7-1 Magneto ............................................. 29 7-2 Breaker Point Adjustment .................................. 29 74 Magneto Trouble Shooting ................................... 31 7-3 Timing Adjustment ....................................... 30 8 . GOVERNOR ADJUSTMENT ................................... 32 9. CARBURETOR ............................................. 33 9-1 Operation and Construction ................................. 33 9-2 Disassembly and Reassembly ................................ 34 9-3 Adjustment ............................................ 36 10 . RUN-INOPERATION of REASSEMBLED ENGINE ................... 37 11 . TROUBLE SHOOTtNG ....................................... 38 11 -1 Starting Difficulties ....................................... 38 11 -2 Engine Misses ........................................... 39 11-3 Engine Stops ........................................... 39 114 Engine Overheats ........................................ 39 11-5 Engine Knocks ......................................... 40 11-6 Engine BackfiresThroughCarburetor ........................... 40 12 . CHECKS AND CORRECTIONS ................................. 41 13 . CORRECTION TABLE ....................................... 42 14 . MAINTENANCE and STORING ................................. 48 14-1Daily Checks and maintenance(Every 8 Hours) .................... 48 14-2 Every 20 Hours Checks and Maintenance ........................ 48 14-3 Every 50 Hours (10 Day) ChecksandMaintenance .................. 48 14-4 Every 100 . 200 Hours (Monthly) Checks and Maintenance ............ 48 14-5 Every 500 . 600 Hours (Semianual) Checksand Maintenance ........... 49 14-6 Every 1000 Hours (Yearly) Checks and Maintenance ................. 49 14-7 Preparation forLong-Term Storage ............................ 49

1. SPEC1 FICATIONS [ N m p 5 2 0 n 0 " V t 1 c t I I i -1 -

2. PERFORMANCE 2-1 MAXIMUM OUTPUT n The Maximum output of an engine is such standard power as developed by that engine, after its initial run-in period with all the moving parts properly worn-in, when operating with the fully openthrottlevalve.Therefore,it follows that a newenginemaynotdevelopthismaximum output in the beginning, because moving parts are not in a properly worn-in condition. 2-2 CONTINUOUS RATED OUTPUT The continuous rated output of an engine is such power as developed by that engine when running at anoptimumspeedmostfavorablefromthepointofviewofenginelifeandfuel consumption ratio. Therefore, it follows that when designing a driving system for any mechanism, with a model EY14, EY18-3, EY23, EY25-2 and EY27-2 engine, as a prime mover, the continuous power requirement of that mechanism must be kept below the continuous rated output specified. 2-3 MAXIMUM TORQUE and FUEL CONSUMPTION RATIO AT MAX. OUTPUT The maximum torque of an engine is that driving torque of the driving shaft at which the engine is driving an external load, while the engine is developing its max. output. The fuel consumption ratio at max. output is that fuel consumption ratio of an engine while that engine is running at the rnax. output. PERFORMANCE CURVE PERFORMANCE CURVE MODEL EY18-38 -2-

PERFORMANCE CURVE MODEL EY23 7 ( ) for B type 1.5(3.0) 1.0 (2.0) 6 I 5 kg-m HP I 4 3 I g1HP.h 3 50 2 300 250 2000 3000 4000 (1 000) (1 500) (2000) rpm __c PERFORMANCE CURVE MODEL EY25-2 ( ) for B type .h PERFORMANCE CURVE MODEL EY27-2 ( ) for 8 type 1.4(2.8) 1.3(2.6) 7 I kg-m 6 5 HP I4 3 I g1HP.h 340 2 320 2500 3000 3500 4000 (1250) (1500) (1750) (2000) rpm - -3 -

FEATURES A compact, lightweight and durable 4-cycle air-cooled engine with high power output, embodying ingenious design technique and advanced production skill. n Simple construction, smart appearance, easy start. Reliable power for wide. variety of purposes, with smooth speed controll by a governor, under varying load conditions. Economical advantage through low fuel consumption. Great versatility in installation through a 360° belt extension possibility and a two side oil fill and drain arrangement. GENERAL DESCRIPTJON of ENGINE CONSTRUCTION CYLINDER, CRANKCASE The cylinder and the crankcase are die-cast as a compact aluminium mono-block piece. The cylinder liner and the valve seats are made of special alloy cast iron and are imbedded in the aluminium casting as inserts. The intake and exhaust ports are located at one side of the cylinder and are also made of inserted pieces in the casting. The crankcase is separable at the driving shaft side and this separable piece constitutes the main bearing cover. 4-2 MAIN BEARING COVER As the aluminium die-cast main bearing cover is built onto the crankcase on the driving shaft side, the engine 'inside are reached for inspection, easily by simply removing it. It is also provided with a flange and boss for directly mounting operating machines such as generators and pumps. There are two oil filters serving also as oil gauges provided at two locations. (However, in EY18-3 or EY23 engine, at one location in the carburetor side.) 4-3 CRANKSHAFT The crankshaft is machined from a carbon steel forging with an induction hardened crank pin. On the fan side, the breaker cam is provided and on the driving side, the crankshaft gear is force-fit. 44 CONNECTING ROD and PISTON The connecting rod is machined from an aluminium alloy forging in which the forged alloy itself serves as the bearing metal at both ends. On the large end, an oil scraper for splashing the lubricating oil is provided. The piston is machined from an aluminium alloy casting and is provided with two grooves for compression rings and one groove for the oil ring. 4-5 CAMSHAFT The camshaft is machined from a carbon steel forging with integral intake and exhaust cams and is provided with a force-fit cam gear. In the model B engine, the camshaft serves also as the driving shaft, being driven at half the crankshaft speed. In the EY14D, EY23D, EY25-2D and EY27-2D engines, the camshaft is machined from a special alloy cast iron with an integral camshaft gear, and is supported by aluminium bearing metals machined integral with the crankcase at both ends. (no ball bearing is used) n -4 -

4-6 VALVE ARRANGEMENT The exhaust valve is positioned in the upstream side of the cooling air with the result that the exhaust valve is intensively cooled for engine life improvement. - 4-7 CYLINDER HEAD A Ricardo type combustion chamber of ample area is employed for good combustion efficiency. The spark plug is mounted obliquely to facilitate fuel tank mounting. 4-8 GOVERNOR The flyweight type governor effectivelyoperatesto maintain the selected speed at varying load. The model EY14, EY18-3 and EY23 engine is equipped with a separate gearing for the governor to secure better performance. 4-9 COOLING Cooling is accomplished by a flow of air circulated past the cylinder walls and head fins from a combination fan-flywheel. The air is guided by a cylinder buffle and a head cover. The EY14, EY18-3, EY23, EY25-2 and EY27-2 engines are equipped with curved vane fans made in two modifications, each for direct drive and reduction drive engines. 4-10 LUBRICATION Lubrication for rotating and sliding parts is accomplished by scooping and splashing the oil in the crankcase with oil scraper attached to connecting rod. 4-11 IGNITION The ignition system is of the flywheel magneto type with the ignition timing set 230 before T.D.C. The magneto comprises a flywheel, ignition coil and a breaker, of which the flywheel (serving also as a fan) is mounted on the crankshaft and the two other members are mounted directly in the crankcase. (for details, refer to 7. MAGNETO section) The model EY23 engine normally incorporates an electronic ignition system. 4-12 CARBURETOR A horizontal draft carburetor is employed. Its setting has been carefully determined after through testing to achieve best starting, accelerating, fuel consumption, output and other performances. For other details such as construction, refer to 9. CARBURETOR section. 4-13 AIR CLEANER The model EY 14, EY18-3 and EY23 engines are equipped with an oval air cleaner incorporating 8 sponge element. The cycl.one type air cleaner with a semi-wet double element is optional. The model EY25-2, EY27-2 engines are equipped with an cyclone type semi-wet double element air cleaner. -5-

4-14 SECTIONAL VIEW of ENGINE 4-14-1 MODEL EY14 FI Blower ywheel (Cooling Housing Starting Pulley- MODEL EY14 ver -6-

Robin EY14, EY18-3,EY23, Ey25-2, EY27-2 service manual

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