EH12, EH17, EH25 - Small Engine Discount

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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. Review the following instructions carefully for ,” installing the engine. 11 -1 INSTALLING When mounting the engine, carefully examine its position, the method of connecting it to a machine, the foundation, and the mehtod of supporting the engine. When determining its mounting position, in particular, make sure that gasoline and oil can easily be supplied and checked, the spark plug can easily be checked, the air cleaner can easily be serviced, and that the oil can easily be discharged. 11 -2 VENTILATION Fresh air is necessary for cooling the engine and burning the fuel. In the casc the engine is operated under a hood or in a small room, temperature rise in the engine room can cause vapor lock, oil deterioration, increased oil consumption, loss of power, piston seizure, shorter enginc life, etc., making it impossible to operate the engine properly. It is necessary, therefore, to provide a duct or baffle to guide cooling air to the engine to prevent recirculation of he hot air used for engine cooling, and temperature rise of the machine. Keep the engine room temperature below 5O0C even in the hottest period of the year. 11 -3 EXHAUST GAS DISCHARGE Exhaust gas is noxious. When operating the engine indoors, be sure to discharge the exhaust gas outdoors. If a long exhaust pipe is used in such a case, the internal resistance increases causing loss of engine power. Thus pipe inside diameter must be increased in proportion to exhaust pipe length. Exhaust pipe: Less than 3m long, pipe inside diameter 30mm, Less than 5m long, pipe inside diameter 33mm. 11-4 POWER TRANSMISSION TO DRIVEN MACHINES 11 -4-1 BELT DRIVE Takc the following notes into consideration. * V-belts are preferable to flat belts. * The driving shaft of the enginc must be parallel to the driven shaft of the machine. * ‘I’hc driving pulley of thc engine must be in line with the driven pulley of the machine. * Install thc engine pulley as close to the engine as possible. * If possiblc, span the belt horizontally. * Disengage the load when starting the engine. If no clutch is uscd, use a belt tension pulley or the like. 11-4-2 FLEXIBLE COUPLING When using a flcxible coupling, runout and misalignment between the driven shaft and engine shaft must he minimized. Runout and misalignment tolerance are specified by the coupling manufacturer. n - 56 -
12. SERVICE DATA “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. 12- 1 CLEARANCE DATA AND LIMITS Unit: rnrn (in) CYLINDER HEAD 0 Flatness ITEM L ” STD EH12/17/25 Limit LESS THAN 0.05 (0.002) 0.1 (0.004) Valve seat contact width ” IN. EX. 0.7 - 1 .o (0.028 - 0.039) 2.0 (0.079) 0 Valve guide inside dia. EH12,17 “ 5.500 - 5.51 8 (0.21 65 - 0.21 72) 5.65 (0.2224) “ EH25 6.600 - 6.622 (0.2598 - 0.2607) 6.75 (0.2657) - 57 -
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ROBIN ROBIN AMERICA, INC. ROBIN TO
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" . 13-1 13-2 13-3 13-4 13-5 13-6 1
Page 6 and 7:
~~~~ ~~ Model TY Pe Bore X Stroke P
Page 8 and 9:
2. PERFORMANCE 2-1 MAXIMUM OUTPUT A
Page 10 and 11: n 0 EHf7D, B (. ). for B type " kg-
Page 12 and 13: 3. FEATURES 1. The overhead valve d
Page 14 and 15: 4-6 CAMSHAFT ‘I’he camshaft for
Page 16 and 17: 4-12 IGNITION SYSTEM The ignition s
Page 18 and 19: ROCKER ARM I L - 14 -
Page 20 and 21: 5-3 DISASSEMBLY PROCEDURES Step Par
Page 22 and 23: ~~ I Step I Part to remove 1 Proced
Page 24 and 25: Step Part to remove Procedures Rema
Page 26 and 27: ~ ~~ ~ ~~ ~~~ ~ I Step Part to remo
Page 28 and 29: ~~ ~ ~~ Step 18 Part to remove 1 Pr
Page 30 and 31: Step Part to remove 1 Procedures Re
Page 32 and 33: Step 26 Part to remove Connecting r
Page 34 and 35: ~~~~ Step Part to remove Procedures
Page 36 and 37: TOP RING “N” MARK SECOND RlNC O
Page 38 and 39: 54-5 BALANCER SHAFT (EH25 type only
Page 40 and 41: Fig. 5-36 (2) Lubricate the oil sea
Page 42 and 43: (2) Loosen the lock nut on the rock
Page 44 and 45: (3) Connect the speed control lever
Page 46 and 47: 5-5 BREAK-IN OPERATION An engine th
Page 48 and 49: 6-3 WIRING DIAGRAM STANDARD - Ignit
Page 50 and 51: 8. CARBURETOR 8-1 OPERATION AND CON
Page 52 and 53: 8-2-4 MAIN SYSTEM (1) Remove the bo
Page 54 and 55: (4) Remove the reel from the starte
Page 56 and 57: (6) Test the operation of the recoi
Page 58 and 59: 10-1-3 IGNlTfON SYSTEM Check the fo
Page 62 and 63: ITEM T EH12 T EH17 Unit: mrn (in) S
Page 64 and 65: ~~ ~~~ ~ Ring groove ITEM side clea
Page 66 and 67: ITEM T STD EH12 Limit Unit: mrn (in
Page 68 and 69: ~ CONNECTING ROD ITEM T STD EH25 Li
Page 70 and 71: Unit : mm (in) CAMSHAFT ITEM STD EH
Page 72 and 73: ITEM T STD EH25 Limit Unit: mm (in)
Page 74 and 75: 12-3 OIL GRADE CHART I 5w I Compari
Page 76: ~ ~ ~~~~ ~ ~ 13-4 EVERY 100-200 HRS
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EH12, EH17, EH25 - Small Engine Discount

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