Makita EM4251 Service Manual Page 47
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10 - 3 Engine stops
(1) Fuel tank empty. Water, dirt, gum, etc. in gasoline.
(2) Vapor lock, 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 hole in the fuel tank cap plugged.
(5) Bearing parts sized due to lack of oil.
(6) Magneto or ignition coil faulty.
10 - 4 Engine overheats
(1) Crank case oil level low. Add oil immediately.
(2) Spark timing incorrect.
(3) Low grade gasoline is used, or engine is overloaded.
(4) Cooling air circulation restricted.
(5) Cooling air path misdirected causes loss of cooling efficiency.
(6) Cylinder head cooling fins clogged up with dirt.
(7) Engine operated in an enclosed space without sufficient cooling air.
(8) Exhaust gas discharge restricted, or carbon deposits in the combustion chamber.
(9) Engine running on low-octane gasoline detonates due to heavy load at low speed.
10 - 5 Engine knocks
(1) Poor quality gasoline.
(2) Engine operating under heavy loaded condition at low speed.
(3) Carbon or lead deposits in cylinder head.
(4) Spark timing incorrect.
(5) Loose connecting rod bearing due to wear.
(6) Loose piston pin due to wear.
(7) Curses of engine overheat.
10 - 6 Engine backfires through carburetor
(1) Water or dirt in gasoline, or low grade gasoline.
(2) Intake valve stuck.
(3) Valves overheated, or hot carbon particles in the combustion chamber.
(4) Engine cold.
11 - 1 Installing
When installing the engine, carefully examine its position, the method of connecting it to a machine, the
foundation, and the method of supporting the engine.
when determining its mounting position, in particular, make sure that gasoline and oil can be easily supplied
and checked, the spark plug can be easily checked, the air cleaner can be easily serviced, and that the oil
can be easily be discharged.
11 - 2 Ventilation
Fresh air is necessary for cooling the engine and burning the fuel.
In case that 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
engine 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 the hot air used for engine
cooling, and temperature rise of the machine. Keep the engine room temperature below 50
° even in the
hottest season in the year.
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.
50
°
- Model: EM4250, EM4251 1
- CONTENTS - 1/2 2
- CONTENTS - 2/2 3
- 1. SPECIFICATIONS OF ENGINE 4
- 2. PERFORMANCE 5
- MAXIMUM TORQUE 6
- MAXIMUM HORSEPOWER 6
- RECOMMENDABLE 6
- HORSEPOWER RANGE 6
- FUEL CONSUMPTION 6
- 3. FEATURES 7
- P 5 / 45 8
- P 6 / 45 9
- Fig. 3-2 9
- Fig. 3-3 9
- P 8 / 45 11
- 4 - 4 Piston Rings 11
- 4 - 5 Cam Gear 11
- 4 - 6 Cooling System 11
- 4 - 7 Lubrication System 11
- 4 - 10 Air Cleaner 12
- 4 - 11 Decompression System 12
- P 9 / 45 12
- 4 - 8 Ignition System 12
- 4 - 9 Carburetor 12
- P 12 / 45 15
- P 13 / 45 16
- Return Pipe 16
- Fig. 5-7 16
- Fig. 5-8 16
- P 15 / 45 18
- P 16 / 45 19
- Recoil side 20
- P 18 / 45 21
- P 20 / 45 23
- P 21 / 45 24
- P 22 / 45 25
- P 23 / 45 26
- P 24 / 45 27
- P 25 / 45 28
- 5 - 3 - 4 Oil Case 28
- P 26 / 45 29
- 5 - 3 - 5 Oil Case 29
- 5 - 3 - 6 Ignition coil 29
- 5 - 3 - 7 Blower housing 29
- <Note> 29
- P 27 / 45 30
- 5 - 3 - 8 Cam gear 30
- P28 / 45 31
- 5 - 3 - 10 Cam gear cover 31
- Fig. 5 - 41 32
- P 31 / 45 34
- 6. MAGNETO 38
- P 36 / 45 39
- 7 - 2 Inspection 39
- 8. Carburetor 40
- P 38 / 45 41
- P 39 / 45 42
- 8 - 2 - 1 Precautions 42
- 9. Recoil starter 43
- 9 - 2 Reassembling 44
- P 42 / 45 45
- 9 - 4 Other guides 45
- 10. Trouble shooting 46
- 11. Installation 47
- P 45 / 45 48
- 11 - 3 Exhaust gas discharge 48
- 11 - 4 - 1 Belt drive 48
- 11 - 4 - 2 Flexible coupling 48
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