Chapter V Disassembly & Repair
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b. Check
Engine-oil protective system
The engine-oil protective system is designed for preventing damage from insufficient engine oil inside the
crankcase. When the oil level decreases under the safety line, the engine-oil protective system will automatically
shut down the engine (the switch of engine is still at the location of “On”); if the engine stops automatically and
cannot start, firstly check the oil level and other faults then.
1) When the engine is under operation, disconnect the yellow lead wire of engine-oil protector and ground
through the engine to confirm that the engine is shut down.
2) After shutting down the engine, it is normal that under the case that engine oil quantity meets specifications and
don’t disconnect the yellow lead wire of the oil level alarm, the yellow lead wire is conductive to the earth wire.
3) When the oil-level sensor grounds and the rotating speed of engine is less than 800±50 rpm, the engine-oil
protector will not act; when the rotating speed of engine is greater than 800±50 rpm, the engine oil protector
delays action for (1.8±0.2)S and the igniter flames out; when the engine operates normally and the oil-level sensor
grounds, the engine-oil protector delays action for 1 S.
Oil level
alarm
Engine oil
protector
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