Reasons for Fuel Injector Burning

Fuel injector working principle

The injector atomizes the diesel fuel and sprays it into the combustion chamber. The injector consists mainly of the nozzle and nozzle holder. The main components of fuel injector are as follows:

1. Rod type filter
2. Cap nut
3. Compressing spring
4. Compression pin
5. Cap nut for fixed nozzle
6. Nozzle holder
7. Connect hole for fuel delivery
8. Nozzle holder
9. Connect tube for overflow
10. Shim
11. Pin
12. Nozzle bush

There is no doubt that the nozzle burning will definitely influence the normal operation of the machine. If you find the related causes, you can quickly solve the problems.

1. Long time idling operation

Due to the diesel engine keeps running slowly for a long time, the temperature in the cylinder is low, the fuel combustion is not sufficient, the combustion chamber and fuel injection nozzle are easy to form carbon deposition. So it leads to the deterioration of working conditions for fuel injection nozzle. Especially in winter, it is even more serious under the condition of cold climate. Because the combustion chamber has carbon deposition, heat dissipation is slow, which may cause spray orifice obstruction of the injection nozzle and the oil drip phenomenon may happen. The fuel stays in the nozzle head for a long time, the local high temperature will make the nozzle and thermal insulation jacket burned.

2. The fuel is not clean

Due to there are small particles of impurities in the fuel, the needle valve and needle valve body of the fuel injector will wear. It is possible that the needle valve will be stuck in the needle valve body.Because of needle valve lag, the fuel can’t be periodically, quantitatively and quickly sprayed into the combustion chamber, the oil drip phenomenon will appear, which may cause the fuel atomization is not good and the combustion speed is reduced. Due to the burning time of the nozzle is extended, which will make the nozzle and the thermal insulation jacket burned. When such fault occurs, there will be black smoke and chattering phenomenon.

3. Fuel injection time is too late

The fuel injection advance angle is too small which may lead to a late fuel injection time. If it can’t be adjusted for a long time, the local high temperature will make the nozzle and thermal insulation jacket burned.

4. Improper assembly

If the nozzle insulation sheath is installed without cleaning, there will be a gap between the fuel injection nozzle and the insulation sheath. The gas enters into the gap, the heat insulation and cooling effect is reduced, which will cause the fuel injection nozzle and the insulation sheath burned. If the thermal insulation sheath is too tight, the nozzle will generate additional stress. Under the combined action of heat alternating load and high pressure of fuel injection, the nozzle will be broken and the needle valve will be stuck. In addition, if the insulation sheath can’t get installed during maintenance, the nozzle extends into the combustion chamber more than 4mm above the cylinder head bottom, the heat absorbed by the injection nozzle will increase, which make the nozzle melted.

5. Improper use of the genset

If it lacks of coolant liquid while the unit is at work, the combustion chamber can’t be in good state of cooling, which will lead to the high temperature. This is also an important reason to cause the burning of fuel injection nozzle.

Prevention

As mentioned above, the fuel injection nozzle is one of the important equipment of diesel genset. For the nozzle maintenance, it is necessary to keep the fuel system clean and avoid purchasing the fuel from unreliable sources.

Step By Step: How to Change A Tyre

It is important to know exactly how to change a tyre in case you end up into a messy situation on the side of the highway. Some of us have people to call in these cases but there are occasions where you might be far out and help could take some time to arrive. Here is an easy step-by-step tutorial on how to change your tyres.

Firstly, make sure that you stop on the side of the road where it is safe and you have enough space to change the tyre. Always be aware of the oncoming traffic where you are changing the tyre.
Making sure that you have all the necessary tools to do this job is an important factor. You will need a tyre iron, a jack, a spare tyre that is properly inflated and fit for the purpose, as well as the manual for the car. This manual will give you the necessary instructions on how to change the tyre if there are specific features your car may have.
Make sure that you have the handbrake activated before you start with the wheel changing process. It is also important to place an object behind the opposite wheel in case the car starts to roll backwards.
On most cars, there are indentations under the car that make for a stable place to place the car jack. You can see where these indentations are by means of small markings along the side of the car. The side of the car has to be at least twenty centimetres off the ground so that you can easily change the part.
You will need to remove the hubcap so that you can reach the tyre. The hubcap has been clipped on and can be removed by wedging the flat part of the tyre iron into the crevice of the cap. The hubcap is the part of the tyre that protects the lug nuts beneath.
Loosen the lug nuts using the correct side of the iron. Some cars have special adaptors that fit onto the nuts. You won’t need to completely remove the lug nuts as of yet. You can remove them as soon as you have taken the tyre off of the wheel. The tyre should simply click out of place and be easy to remove.
Fit the spare tyre to the wheel piece. The bolts have to line up with the holes. Place the lug nuts onto the bolts and start tightening it equally by hand. You can then use the iron to tighten the nuts properly without having wasted too much energy. Do not over fasten as it could break.
You can then place the hubcap back onto the face and lower the car. The spare tyre should only be used for emergency moments. You will notice that they are narrower than a regular tyre.

Now you can drive safely to a fitment centre. As soon as you get there you should get the tyre replaced.

Minty’s is amongst the leading tyre suppliers in South Africa, and is recognized for our high standard of customer service. We have built a reputation amongst our customers and ensure that they receive tyres and alloy wheels of the highest quality, amongst the largest brands nationwide.

Repairing Flood Damage to Your Car

1. Do not attempt to start the car!
It’s tempting to turn the key and see if the car still works, but if there is water in the engine, attempting to start it could damage it beyond repair. Don’t try to start the car. If there’s water in the engine, transmission or fuel system, you’ll just compound the damage. Your best option is to have your car towed to a mechanic work shop.

2. Determine how deep the car was submerged.
Mud and debris usually leave a waterline on the car, inside as well as out. If the water didn’t rise above bottom of the doors, your car will probably be fine. if water reaches the bottom of the dashboard, you car won’t definitely not be fine.

3. Dry the interior.
If water got inside the car, mole will grow quickly. Mold and corrosion are setting in now. You need to clean out as much liquid and mud as you can and dry out your car as soon as possible Start by opening the doors and windows and putting towels on the floor to soak up water, however you should plan on replacing anything that got wet, including carpets, floor mats, door panels, seat padding and upholstery.

4. Check the oil and the air cleaner.
If you see droplets of water on the dipstick or the level of the oil is high, or if the air filter has water in it, do not attempt to start the engine. Have it towed to a mechanic to drain the water and have the fluid changed. If you are the do-it-yourself type, you can try changing the oil then removing the spark plugs and cranking the engine to blow out the water, but we still recommend taking your car to a professional mechanic. Fuel systems on more moderns cars are usually sealed, but older cars may need to have their fuel systems drained. Brake, clutch, power steering and coolant reservoirs should be checked for contamination.

5. Check all of the electrical systems.
If the engine looks OK to start, check everything electrical: Headlights, turn signals, air conditioning, stereo, power locks, windows and seats, even the interior lights. If you note anything even slightly flicker, including the way the car runs or the transmission change, that could be a sign of electrical issue. Take the car to a mechanic immediately.

6. Check around the wheels and tires.
Before attempting to move the car, look for debris lodged around the wheels, brakes and under body. Make sure nothing this obstructing the movement of the wheels.

7. It is advisable to consider replacing a flooded car
A flood-damaged car may not should signs of problems immediately, it could take months or even years before such problems begin to manifest. If you can it is advisable you consider replacing the car. Replacing it will cost money, but you may save yourself from some major (and expensive) headaches down the road.

8. Beware of flood-damaged cars in the market.
Many used cars in the market today are flood damaged cars that are simply cleaned up and re-sold. Before buying a used car, have the title checked; words like “salvage” and “flood damage” are giant red flags. Get a comprehensive history on the car — if the car has been moved from an area where there has been recent flooding you should be suspicious.