What to do if the lawnmower engine emits black smoke

1. Reasons. 1.The flammable mixture is too thick.

2.There is too much oil in the engine fuel. 3.

Poor piston ring or crankshaft oil seal sealing. 4.There is moisture in the fuel.

5.Bad spark plug 6The air filter is too dirty.

2. Fault diagnosis and elimination.

1.For the inspection and diagnosis of excessive concentration of combustible mixtures, the carburetor and air filter should be checked.

2.The blend does not compare with the blend of the oil, or the wrong grade of oil is used. If the oil mixture contains too much oil or the oil quality is poor, the oil of the flammable mixture cannot be completely burned, resulting in black smoke.

The above phenomenon can also occur in two-stroke engines with separate lubrication and oil pump misalignment and excessive oil supply. At this time, the oil pump should be checked and adjusted according to the regulations to ensure that the lubricating oil is supplied proportionally at different throttle openings.

3.Excessive wear or breakage in a four-stroke engine, as well as too much oil in the crankcase, can cause oil to string into the combustion chamber and cause excessive oil in the mixture. If the crankshaft oil seal of a two-stroke engine is broken, it will also cause the oil from the transmission to string into the crankcase and enter the combustion chamber with the mixture.

4.One of the reasons for the mixing of water in the fuel is that the fuel in the fuel tank itself contains water, so the fuel tank should be cleaned and the fuel should be replaced. Another reason is that the cylinder gasket of the water-cooled engine is broken, and cold water enters the cylinder.

If, in the absence of leakage, the water in the tank is consumed too quickly, and the exhaust smoke from the exhaust pipe is slightly white, this is mostly the reason and the head gasket should be replaced.

Black smoke from gasoline engines is rare, black smoke is mainly not completely burned fuel in the combustion chamber, in the case of high temperature and lack of oxygen, diesel can not be completely and fully combusted, so decomposition and aggregation to form soot, it is a small diameter of the aggregate.

Because this aggregate reacts much slower than gasified fuel, due to the high temperature and anoxic environment of the combustion chamber, it cannot be fully burned again and is discharged through the exhaust pipe, so black smoke is presented.

The direct consequence of this phenomenon is that the fuel consumption of diesel engines is very high, the power is reduced, and at the same time, a large amount of carbon deposits exist in the piston and piston ring valves. In severe cases, the piston rings will be jammed, the valve seal is not tight, and the air leakage will be accelerated, and at the same time, it will also accelerate the wear of parts, thereby reducing the service life of the engine, so this aspect should be paid special attention.

Garden Machinery Questions: What's the deal with black smoke from lawn mowers?

Garden Machinery Problem: What is the problem of black smoke from lawn mowers? Hello dear, this phenomenon is due to incomplete fuel burning.

When black smoke is emitted, it is often accompanied by a decrease in engine power, too high exhaust air temperature, and too high water temperature, which leads to wear of engine parts and reduces engine life. The causes of this phenomenon (there are many causes of incomplete combustion) and how to eliminate them are as follows. (1) The exhaust back pressure is too high or the exhaust pipe is blocked.

This situation will cause insufficient air intake, which will affect the air-fuel mixing ratio, resulting in excessive oil volume. This situation occurs: first, there are too many exhaust pipe bends (especially 90° bends), which should be minimized; The second is that the inside of the muffler is blocked by too much soot and should be removed.

2) Insufficient air intake or blocked air intake duct. In order to find out the cause, the following checks should be carried out: first, whether the air filter is blocked; the second is whether the intake pipe is leaking (if this phenomenon occurs, the engine will be accompanied by a harsh whistling sound due to the increase in the load and distribution); The third is whether the turbocharger is damaged.

The blades of the exhaust gas wheel and booster wheel should be checked for damage and whether the rotation is smooth and flexible; Fourth, whether the intercooler is blocked. (3) The valve clearance adjustment is incorrect, and the valve seal line is not in good contact. Valve clearance, valve springs and valve seals should be checked.

4) The oil supply of each cylinder of the high-pressure oil pump is uneven or excessive. The uneven oil supply will produce unstable speed and intermittent black smoke, which should be adjusted to make it balanced or within the specified range. (5) If the injection is too late, the advance angle of the injection should be adjusted.

6) If the injector is working poorly or damaged, it should be removed for cleaning and inspection. (7) Injector model selection is incorrect. Imported high-speed engine has strict requirements for the selected injector (injection aperture, number of holes, injection angle), if the choice is improper, it will also cause the engine to emit black smoke, even if the same model of engine, in different use of the number of training (output power, speed, etc. is different), the injector model required to be used is not the same.

If the incorrect injector is selected, the correct type of injector should be replaced. (8) Diesel is of poor quality or wrong grade. The imported high-speed diesel engine equipped with a direct injection combustion chamber with a porous injector has strict requirements for the quality and grade of diesel due to the small aperture and high precision of the injector, otherwise it will also cause the engine to emit black smoke and even make the engine unable to run normally.

Therefore, clean and qualified light diesel oil should be selected, and it is recommended to use 0 or +10 in summer, -10 or -20 in winter, and -35 in severe cold areas. (9) The wear of cylinder liner and piston assembly is serious. When this happens, the piston ring seal is not tight, and the air pressure in the cylinder drops seriously, resulting in the diesel fuel can not be fully burned and black smoke is emitted, and the engine power drops sharply.

What to do with black smoke from a lawn mower**? Hello dear! We are glad to answer that the reason for the black smoke caused by the lawn mower is that the mixing specific gravity of the intake combustion is too deep, and the fuel enters more and the air enters less.

Exclusion method: clean or update the air filter; If the fault is not corrected, the engine carburetor needs to be adjusted or cleaned. In addition, the reason for the blue smoke caused by lawn mowers is the participation of organic oils in combustion.

Troubleshooting method: After discovering the fault, check the oil dipstick first to see if the oil is excessive; If it is excessive, drain the excess oil and run for another 10 minutes; If the fault is still not resolved, the engine needs to be serviced. The cause of white smoke is the presence of water in combustion.

Exclusion method: low weather temperature is a normal phenomenon; If there is water in the fuel, replace it with a new anhydrous fuel. Common precautions for lawn mowers 1. The grass collection bag has not been cleaned for a long time, resulting in unclean and non-breathable grass collection.

Elimination method: Clean the grass collection bag. 2. If the grass discharge port is not cleaned for a long time, the grass will block the grass discharge port, resulting in poor grass drainage.

Exclusion method: Clean the grass drain. 3. The blade is worn excessively, and the blade cannot collect grass from the effect.

Exclusion method: Replace the blade. 4. Engine wear, excessive power loss, and low blade rotation speed lead to poor grass collection effect.

Exclusion method: Repair or adjust the engine so that it is brought up to the rated requirements. Hope it helps!