Manuale d’uso / di manutenzione del prodotto HD7832 del fabbricante Subaru Robin Power Products
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ROBIN AMERICA, INC. ROBIN TO W1SCONSJ.N ROBIN ENGINE MODEL CROSS REFERENCE LIST ROBIN EY08 EY15 EY 15V EY20 EY20V EY23 EY28 EY35 EY40 EY45V EY2 I EY44 EY 18-3 EY25 EY27 EHl1 EH12 EHl5 EH17 EH2 1 EH25 .
CONTENTS Section Title Page 1 .SPECIFICATIONS. ..................................................................................... 2.PERFORMANCE ........................................................................................ 2-1 Maximum Output .
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1. SPECIFICATIONS EH30 Model EH30B EH30D EH30BS I EH30DS Type Air-Cooled. 4-Cycle. Single-Cylinder, Horizontal P.T.O. Shaft, Gasoline Engine Bore X Stroke 8.3 Compression Ratio 291 cc (1 7.76 cu.in.1 Piston Displacement 78 X 61 mm (3.07 X 2.40 in.) -~ output Cont i nuous 9.
Model EH34 EH348 EH340S EH34BS 1 EH34D Type Air-Cooled, 4- Cycle, Single- Cylinder, Horizontal P.T.O. Shaft, Gasoline Engine ~~~~~ Bore X Stroke 8.3 Compression Ratio 338cc (20.63 cu.in.) Piston Displacement 84 X 61 mm (3.31 X 2.40 in.) output Cont i nwus 1 1.
2. PERFORMANCE 2-1 MAXIMUM OUTPUT The maximum output is the output of an engine with its throttle valve fully opened under the condition that all the moving parts are properly worn in after the initial break- in period. A new engine may not produce full maximum output while its moving parts are still not broken -in.
2 - 4 PERFORMANCE CURVES OEHBOD, B 9 8 7 6 5 4 3 2 1 0 2000 2400 2800 3200 (1 000) (1 200) (1 400) (1 600) 3600 (1 800) REVLOUTION- r. p. m. Kg - m CONTINUOUS RATED OUTPUT RECOMMENDABLE HORSEPOWER RA.
*EH34D, B HP A 52 B w cn 0 I 2000 2400 2800 3200 3600 (1 000) (1 200) (1 400) (1 600) (1 800) REVLOUTION- r. p. m. Kg - m w 3 0 CONTINUOUS RATED OUTPUT RECOMMENDABLE HORSEPOWER RANGE -5-.
3. FEATURES 1. The overhead valve design offers a compactness, light weight and ideal combustion charastristics 2. The vibration free design with the twin balancer system and lighter reciprocating parts.
4- 3 CRANKSHAFT The crankshaft is forged carbon steel, and the crank pin is induction-hardened. The output end of the shaft has a crankshaft gear and balancer gear that are pressed into position. (See Fig. 3.) 4-4 CONNECTING ROD AND PISTON The connecting rod is forged aluminum alloy, and its large and small ends function as bearings.
4- 6 CAMSHAFT The camshaft for the D- type engine is made of special cast iron and camshaft gears are casted together in one piece. Both sides of the shaft fit into the plane bearings on the crankcase and main bearing cover. The camshaft for B- type engine is made of forged carbon steel and also functions as PTO shaft.
4- 9 GOVERNOR SYSTEM The governor is a centrifugal flyweight type which ensures constant operation at the selected speed against load variations. The governor gear with governor weights is installed in the crankcase and driven by the balancer shaft. (See Fig.
4- 12 IGNITION SYSTEM The ignition system is a transistor controlled magneto ignition system which cosists of a flywheel and an ignition coil with a built in transistor mounted on the crankcase. This system has an ignition timing advance for easy starting.
4- 15 BALANCERS Unbalanced inertia force is balanced by the two balancers which rotate at the same speed with the crankshaft to effectively reduce vibration.
4- 17 SECTIONAL VIEW OF ENGINE FUEL 1 /FUEL TANK FLYWHEEL (COOLING FAN) ' MAIN BEARING COVER - 12 -.
PLUG COVER ROCKER ARMS DRAIN PLUG BALANCER SHAFT 2 - 13 -.
5. DISASSEMBLY AND REASSEMBLY 5- 1 PREPARATIONS AND SUGGESTIONS 1) When disassembling the engine, memorize the locations of individual parts so that they can be reassembed correctly. If yor are uncertain of identifying some parts, it is suggested that tags be attached to them.
5- 3 DISASSEMBLY PROCEDURES Step Tool Remarks Procedures Part to remove 1 14mm box wrench Be careful not to lose (1) Remove oil drain plug and drain oil.
Step Part to remove I 2 Air cleaner Procedures Remarks Tool (1) Remove air cleaner cover. Be careful not to lose (2) Loosen two wing bolts and remove washer and gasket for (3) Loosen screw on swivel and pull out (4) Remove two flange nuts and a bolt Pull off breather pipe lonun box wrench element.
Step 3 - Control panel and bracket Procedures (1) Unclamp wires from breather cover. (2) Disconnect wires from connectors. (3) Loosen two bolt and remove control panel. M5 X lOmm bolt and washer -*.. 2pcs. (4) Loosen. flange bolt and remove bracket. ' M6 x 8mm frange bolt * -0.
1 Step ]part to remove1 Procedures I Remarks I Tool I 5 Speed contral ~ lever and ~ governor lever (1) Unhook governor spring from governor lever. (2) Remove clip, wing nut, stop plate, friction plate, and speed control lever. (3) Loosen the bolt and remove governor lever.
Step F 6 7 8 ~~ 'art to rernovc Oil sensor (Option) Oil sensor bracket (Option) Muffler Procedures I Remarks I Tool I (1) Unclamp sensor cord from main sensor unit in any way. (2) Remove oil sensor unit. damage stick and bearing cover. Be very careful not to Remove oil sensor bracket.
'art to remove( Procedures I Remarks Electric starter (Option) Diode rectifier (1) Remove black wire from electric starter. (2) Loosen two bolts and remove electric ~ ~~~ starter. M8 x 30mm bolt .*.- 2pcs. M8 spring washer - 2pcs. M8 washer .....
Step Tool Remarks Procedures Part to remove 12 Wipe off spilt fuel Loosen four flange nuts from bottom of Fuel tank fuel tank and remove fuel tank. 12mm socket M8 flange nut -0.
Step Part to remove Procedures Remarks Tool 13 Recoil Remove recoil from blower housing. lOmm box wrench starter M6 X 8mm flange bolt - - 4pcs. 14 Blower Remove blower housing from crankcase. 1Omm box wrench housing M6 x 8mm flange bolt .-.- 4pcs. BLOWER HOUSING / 1 Fig.
Step Tool Remarks Procedures Part to remove 15 (1) Remove spark plug cap from spark Ignition coil Plug- M6 x 30mm bolt and washer 1.- * 2pcs. (2) Remove ignition coil from crankcase. lOmm box wrench Fuel tank Remove the fuel tank bracket M6 x 8mm flange bolt lpce.
Step 18 - 19 'art to remove Flywheel Charge coil Procedures (1) Remove nut from crankshaft. (2) Remove the starting pulley. (3) Remove flywheel using flywheel puller. (4) Remove the key from crankshaft. M16 nut lpce. (See Fig. 26.) M8 x 12m bolt -*-- 3pcs.
I Step Part to removeJ Procedures 1 Remarks I Tool Exhaust manifold Intake manifold Remove exhaust manifold and gasket from cylinder head. M8 flange nut - - - - 2pcs. Remove intake manifold and gasket from cylinder head. M8 x 28mm bolt and washer - - * * 2pcs.
'art to remove Cylinder head Procedures (1) Remove rocker cover from cylinder head. M6 x 12mm flange bolt .... 4pcs. (2) Loosen adjusting bolts on rocker arms. (3) Pull out rocker shaft from the intake side of the cylinder head. (See FIg. 31.) (4) Remove the push rods from cylinder.
I r Step l~art to remove1 Procedures YtZzz exhaust t (1) Press down spring retainer and slide it to release from the groove of valve stem, then remove spring retainer and valve spring.(See Fig. 32.) (2) Remove intake and exhaust valves from cylinder head.
Step Procedures Part to remove ,26 h4ai.n cover cover on crankcase. bearing (1) Remove bolts fastening main bearing M8 x 4Omm bolt and washer *--*7pcs. (2) Remove main bearing cover from crankcase. (See Fig. 35.) Remarks , Be careful not to ~ damage the oil seal.
Step 27 ~ c 1 28 Part to remove Camshaft and tappets Balancer Procedures (1) Remove camshaft from crankcase. (2) Remone tappets from crankcase. (I) Position piston at top dead center and remove balancer 1 and balancer 2. Remarks Tool (I) To prevent tappets from getting dynages , put crankcase cylinder side down.
I Step l~art to remove1 Procedures I Remarks I Tool ~~ 29 interfere with removal (2) Turn crankshaft until piston is at top piston deposits that might COMfXting rod cap.
Step Tool Remarks Procedures Part to remove 31 (See Fig. 40.) crankshaft to move from crankcase. (1) Tap lightly on flywheel end of Crankshaft - t Fig.
5- 4 REASSEMBLY PROCEDURES 0 PRECAUTIONS FOR REASSEMBLY 1) Clean parts throughly before reassembly. 2) Scrape off all carbon deposits from cylinder head, piston top and piston ring grooves. 3) Check lip of oil seals. Replace oil seal if the lip is damaged.
I' .TOP RING .SECOND RING 'OIL RING fig. 44 5-4-3 PISTON AND CONNECTING ROD When installing piston on connecting rod on D type engine, match the mark "DF"on thepiston with the mark DF"on connecting rod. On B type engine, match the mark "BF" on the piston with the mark " @ BF"on connecting rod.
(2) Install piston and connecting rod assembly into cylinder. Use a piston ring compressor to hold piston rings. The "DF"mark of the connecting rod for "D"type engine or the "BF"mark for "B" type engine is to face flywheel side when assembled.
5-4-5 BALANCER SHAFT Install balancer shaft 1 (left side) and balancer shaft 2 (right side) to crankcase aligning matching marks of balancer gear and crank gear as shown in Fig. 50. Matching mark for balancer shaft 1 is one dot and that for balancer shaft 2 is two dots.
5-4-7 ADJUST CRANKSHAFT AND CAMSHAFT END PLAY (1) Measure end play of crankshaft and camshaft. Adjust end play to the specified values using the proper spacer. CRANKSHAFT Type 8 Type D Type B Type D CAMSHAFT SIDE CLEARANCE 0-0.2 rnm 0.1 3-0.29 m m 0-0.
(2) Lubricate oil seal and bearing surfaces. Add a light film of oil on main bearing cover face to hold gasket in place. Place spacers chosen at procedure (1) on crankshaft and camshaft. Use an oil seal guide when installing main bearing cover to avoid damaging the seal.
5-4- 11 VALVE CLEARANCE ADJUSTMENT (1) Position piston at top dead center of compression stroke by matching the mark of flywheel with the mark T of crankcase. (See Fig. 53.) (2) Loosen lock nut on rocker arm and turn adjusting screw to adjust the clearance between rocker arm and valve stem end.
(1) Install charge coil to crankcase. Clamp coil wire to crankcase. I- [NOTE] Be careful not to pinch coil wire between charge coil and crankcase. (2) Put woodruff key in keyway of crankshaft. Wipe off oil and grease thoroughly from tapered portion of crankshaft and flywheel center hole.
5-4-18 FUEL TANK Install fuel tank to fuel tank bracket. 5-4- 19 ELECTRIC STARTER (Optional equipment) (1) Install magnetic switch to crankcase. (2) Install diode rectifier to crankcase. (3) Install electric starter to crankcase. (4) Connect wires referring to the wiring diagram.
(5) Install carburetor to intake pipe hooking governor rod to governor lever and throttle lever of carburetor. Hook rod spring over governor rod. (See Fig. 59.) to carburetor with gaskets. Tighten two flange nuts and a bolt. Connect breather pipe from tappet cover to cleaner base.
(8) Install control panel to bracket. (9) Put choke knob wire through grommet on cleaner base and fasten to swivel on choke shaft Connect wires. of carburetor.
6-2 BASE THEORY (1) Revolution of the flywheel generates electricity on the primary side of the ignition coil, and the base current I1 flows to the power transistor. Current I1 turns the power transistor "0N"and the electric current Iz flows.
6-3 WIRING DIAGRAM STANDARD Spark Plug 775- Ignition Coil I c " -. ! Flywheel Stop Button Connector Black -1 ElNGlNE WITH ELECTRtC STARTER I I I I I I I I I I I I I I I I I I I I I DIODE RECTIFIER I I r L """""""- 1 l- 1 2VOLT BATTERY MINIMUM 24 AMP.
7. AUTOMATIC DECOMPRESSION SYSTEM The decompression system operates to release compression by lifting up the exhaust valve at starting. The release lever mounted on the camshaft has a flyweight at one end and a crescent cam at the other end. When starting the engine, the crescent cam juts out from the exhaust cam.
8. CARBURETOR 8- 1 OPERATION AND CONSTRUCTION 8-1 - 1 FLOAT SYSTEM The float chamber is located below the carburetor body and, with a float and a needle valve, maintains a constant fuel level during engine operation. (See Fig. 66.) The fuel flows from the fuel tank into the float chamber through needle valve.
8-1 -2 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.
8-2-4 MAIN SYSTEM (1) Remove the bolt (12) and take out float chamber body (13). (2) From the body (14) remove the main nozzle (15), and then remove the main jet (16) and (3) Reassembly guide holder (17) from the main nozzle (15). a) Fasten the main jet securely to the body.
9. STARTING SYSTEM 9-1 RECOIL STARTER When repairing recoil starter, disassemble and reassemble in the following procedures. Tools : Socket wrench, Needle nose pliers, Screw driver [NOTE] The following explanation is applicable to the recoil starter for “D” type engines.
(4) Remove reel from starter case as shown in Fig. 71. Take out reel slowly turning it lightly toward left and right to remove spring from the hook. Do not remove the reel quickly or the spring may escape from the starter case. Untie starter rope from the knob and remove.
starter rope in reel for 2.5 turns in the arrowhead direction as shown in Fig. 74. Then let the rope out of reel from the notch on reel. Line up the hook with inner end of spring and install reel in starter case. Check that the inner end of spring is securely hooked onto the hook.
(6) Test operation of recoil starter to see if rope recoils satisfactorily and ratchets project and retract properly. Mount recoil starter to the engine. (7) If spring escapes from reel when disassembling recoil, hook the outer end of spring onto the notch of reel and rewind the spring into the housing.
(4) The rear cover Remove the rear cover. (5) The (6) The (7) "M" The mov 4mm screws (2pcs.I brush holder. terminal bush No, 2. brush holde is disassembled by re- ,ing the 4 mm screws. (Zpcs.) Remove the "M" terminal bush No, 2. (8) Yoke assembly.
(9) The pinion stopper clip. The pinion stopper clip is removed with a standard screwdriver while the pinion stopper is pushed toward the pinion. (1 0) Pinion stopper.
9 L 11 12 15 14 13 14 I '2 2 0 d3 nlmml 8 9 5 6 4 Fig. 85 1. The 6mm terminal nuts (2pcs.) 2. "M" terminal bush No,1 3. The 5mm through bolts (2pcs.) 4. The Rear cover 5. The 4mm screws (2pcs.) 6. The brush holder 7. "M" Terminal bush No, 2 8.
9-2-2 INSPECTION AND REPAIR (1) ARMATURE a) Check the diameter of the commutator. If the out side diamaeter of the commu- tator is below the minimum Iimit then replace it. Unit : mm I Standard (New) I Limit (Used) I 30 29 b) Continuity test for the armature coil.
d) Check for Surface Distortion on the Arma- ture and the Commutator. Use a dial gauge to measure the distortion of the out side surfaces of the armature core and the commutator. If it is above the limit, then repair or replace it. Unit : mm I I Standard (New) 1 Limit (Used) 1 I Armature I 0.
(2) BRUSH Measure the length of the brushes and if they are under the limit, replace them. Unit : mm Brush Positive side brush Negative side brush Fig. 92 (3) BRUSH HOLDER a> Insulation Test for the Brush Holder. Check for continuity between the brush holder's top (Positive side) and its base (Negative side).
(4) PINION CLUTCH Inspection of the pinion clutch. Rotate the pinion manually. While rotating it in the direction of normal operation, smoothly reverse the direction of rotation to confirm that it locks. In the event of any irregularity, replace it. Fig.
10. TROU8LESHOOTtNG The following three conditionts must be fulflled for satisfactory engine start. 1. The cylinder filled with a proper fuel- air mixture. 2. Good compression in the cylinder. 3. Good spark, properly timed, to ignite the mixture. The engine cannot be started unless these three conditions are met.
10- 1 - 3 IGNITION SYSTEM Check the followings for lack of sparks. (1) Wires of the ignition coil, spark plug or contact breaker disconnected. (2) Ignition coil damaged and shorted. (3) Spark plug cable wet or soaked with oil. (4) Spark plug dirty or wet.
10-5 ENGINE KNOCKS (i) Poor quality gasoline. (2) Engine operating under heavy load at low speed. (3) Carbon or lead deposits in the cylinder head. (4) Spark timing incorrect. (5) Loose connecting rod bearing due to wear. (6) Loose piston pin due to wear.
11. INSTALLATION Engine life, ease of maintenance and inspection, frequency of checks and repairs, and operating cost all depend on the way in which the engine is installed.
12. SERVICE DATA 12- 1 CLEARANCE DATA AND LIMITS Unit : mm (in) ITEM CYLINDER HEAD Flatness Valve seat contact width Valve guide inside dia. IN. EX. T ~EH%/EH34 i Limit 0.05 (0.002) 0.1 (0.004) 0.7-1 .O (0.028-0.039) 2.0 (0.079) 6.600-6.622 (0.260-0.261 1 6.
Unit : mm (in) I EH30 I EH34 CYLlNDER 0 Inside dia. Roundiness after reboring. 8 Cylindricity after reboring. PISTON Q Piston size (At skirt in thrust direction) I STD 78.000-78.01 9 (3.071 "3.072) STD I 1 st 78.250-78.269 reboring (3.081 -3.082) 2nd 78.
Unit : mm (in) EH30 EH34 ITEM Ring groove side clearance Limit STD Limit STD 0.05-0.09 (0.002-0.0035) 0.1 5 (0.006) 0.05-0.09 (0.002-0.0035) 0.1 5 (0.006) TO D 0.03-0.07 '0.001 2-0.0028: 0.93-0.07 0.001 2-0.0028> 0.1 5 (0.006) 0.1 5 (0.006) 0.
Unit : mm (in) 1 STD CONNECTING ROD Big end inside dia. Clearance between big end and crankpin Small end inside dia. Clearance between small end and piston pin Big end side clearance I CRANKSHAFT 38.000-38.01 6 ( 1 -496 1 - 1 -4967) 0.030-0.060 (0.00 1 2-0.
Unit : mm (in) T EH30/EH34 I ITEM STD Limit CAMSHAFT 0 Cam height 36.1 "36.3 (1.4213-1.4291) 35.95 (1.41 54) IN.EX. cams 19.967- 19.980 (0.7861 -0.7866) 19.950 (0.7854) 6.450 (0.2539) VALVE * Valve stem outside dia. 6.535-6.550 (0.2573-0.2579) IN.
Unit : mm (in) ITEM r TAPPET 0 Stem outside dia. Guide inside dia. 0 Tappet guide clearance ROCKER ARM Rocker arm hole dia. Rocker arm shaft clearance VALVE SPRING FREE LENGTH EH30/EH34 STD 8.960-8.975 (0.3528-0.3533) 9.00-9.01 5 (0.3543-0.3549) 0.025-0.
Unit : mm (in) ITEM VALVE SEAT ANGLE (IN. EX.) 0 Valve cutter angle (a) 0 Valve contact width (b) 12- 2 TORQUE SPECIFICATIONS EH30/EH34 STD a : 90" b : 0.7-1.0 (0.028-0.039) Limit 2.0 (0.079) ~ DESCRIPTION ~~~ TIGHTENING TORQUE kg cm I I N m ft Ib ~~ ~~ Cylinder head bolts 61.
12-3 OIL GRADE CHART Specified Lubricant aualitv Single grade Multi- grade Comparison between oil viscosity and temparature t - 20 - 10 0 10 20 30 4oT -4 14 32 50 68 86 104°F Use oil classified as SC or higher. Multi-grade oil tends to increase its consumption at high ambient temperature.
13. MAINTENANCE AND STORAGE The following maintenance jobs apply when the engine is operated correctly under normal conditions. The indicated maintenance intervals are by no means guarantees for maintenance free operations during these intervals.
13-4 EVERY 1 OQ"280 HRS. (MONTHLY) MAINTENANCE REMARKS I ~~~ ~ 1) Clean fuel filter and fuel tank. 2) Inspect cooling system and remove Remove blower housing and clean up between fins and dirt and chaff. housing. 43-5 EVERY 500-600 HRS. MAINTENANCE I MAINTENANCE REMARKS I I head.
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