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Failure analysis

 

1、Blue smoke from the exhaust pipe

The fault phenomenon of blue smoke is: during the engine operation, light blue smoke is often visible at the end of the exhaust muffler, and there is the phenomenon of excessive oil consumption. The reasons for the failure may be: the oil level is too high; the cylinder compression pressure is lower than the specified value; the clearance between the piston, piston and cylinder barrel increases.

2、 black smoke from the exhaust pipe

Black smoke failure phenomenon is: engine work, exhaust smoke, and can smell the pungent gasoline smell, acceleration is more obvious. The cause of the fault may be: the mixture is too thick; spark plug work poor; ignition too late.

3、white smoke from the exhaust pipe

White smoke is the original fault phenomenon: the engine work, white smoke from the exhaust pipe. The cause of the fault may be: the fuel contains water; cylinder or muffler in the water.

 

 

Troubleshooting

1、Blue smoke from the exhaust pipe

First of all, check whether the oil level is too high, because the oil level is too high and easy to cause the oil to run up. When checking the oil level, do not check the engine just after it has stopped, it should be checked after 10 minutes of stopping. If the oil level is too high, drain out the excess oil in time. If the oil level is normal, for longer engines, check the cylinder compression pressure and the piston, piston ring and cylinder wear and tear and the possibility of increased clearance, increased clearance so that the oil up. After inspection, cylinder pressure is lower than the specified value, should further check whether the piston has carbon seized, wear too much or elasticity disappeared. If the above situation occurs, the piston rings should be cleaned or replaced. For the cylinder barrel wear serious, piston and cylinder barrel clearance exceed the specified value, do boring, replace the piston and other disposal.
For just after the overhaul or change the piston ring engine, often due to the piston ring inside and outside the cutout (or cut angle) installed on the wrong oil. If the above situation, should re-install the piston ring.

 

2、Black smoke from the exhaust pipe

Check the concentration of the mixture. After the symptoms of failure, first check the carburetor damper. In the normal operation of the engine, whether there is X longitudinal mechanism stuck, failure and can not close, open the phenomenon, if there should be repaired or replaced. Secondly, you should also check: whether the oil level in the float chamber is too high; whether the float is broken and cannot float; whether the main volume hole needle valve is too open; whether the air filter is blocked, etc. After the engine is switched off, look at the main jet from the carburetor, if there is oil flowing out or dripping, it means that the oil level in the float chamber is too high, the float should be adjusted by bending the tongue piece upwards appropriately or adding appropriate shims under the needle valve acne. Check the float, if it is broken and leaking oil, it should be welded and repaired or replaced. Note that the weight of the repaired float will increase and must be re-adjusted to ensure a normal level of fluid when fitted. Check that the needle valve is not sealed tightly, if so it should be replaced. Check the oil filter, if it is blocked, it should be cleaned or replaced.

 

Check the spark plug jumping situation. If the spark plug jump fire is weak or jump fire is not normal, the mixed gas will not be burned, there will be black smoke condition. Pull off the spark plug, for jumping fire normal, spark strong, that the spark plug no fault; if the spark plug spark is not along the electrode jumping, but around jumping fire, that spark plug jumping fire is not normal, should be replaced with a new spark plug; if the spark plug carbon serious, on the cleaning.

Engine exhaust line in the process of black smoke can be, if the pieces have a "burst" sound and "gun" sound, it means that the ignition is too late. If the above situation, correct in time.

 

3、White smoke from the exhaust pipe

White smoke from the engine exhaust pipe is mostly caused by fuel containing water in the cylinder and water in the muffler. If there has been white smoke phenomenon, indicating that the fuel is not qualified, should be replaced with good quality fuel. If the white smoke is only when starting, disappear after normal operation, this problem is not a concern.

4、Lack of power

Such cases are mostly piston ring aging seal is not good, the valve is not closed or carburetor blockage! Piston rings should be replaced. The piston rings should be replaced. The valves and carburetor should be cleaned.