I've found a solution for all the 20 reasons for burning oil

Categories:NEWS
Time of issue:2019-06-22 18:11

I've found a solution for all the 20 reasons for burning oil

Categories:NEWS
Time of issue:2019-06-22 18:11

1. Dirty oil

If the oil is not changed according to the oil change cycle and the oil filter is not maintained properly, the oil will become dirty, which will block the oil gap at the piston and piston ring, resulting in the increase of oil consumption as described in the reason #17 above. Dirty oil will also aggravate the wear of bearings, cylinders, pistons and piston rings. These worn parts, as explained in the corresponding articles above, will lead to an increase in fuel consumption. Special attention: the consumption of dirty oil itself is higher than that of clean oil.

2. There is too much oil in the oil pan

Due to the incorrect insertion of the dipstick, it failed to seat to the bottom, resulting in the measured oil level being lower than the actual oil level. Therefore, add new oil to make the oil level too high. If the bottom end of the connecting rod of the high pressure lubricating engine touches the oil level, or the oil ring of the splash lubricating engine is immersed in the oil pool too deeply, it will cause excessive oil to be thrown to the cylinder wall and enter the combustion chamber.

3. The piston ring is not suitable for engine type or service type

If the piston ring with inappropriate size is selected (for example, the piston ring with an increase of 0.020 "is used in the cylinder with an increase of 0.040"), the oil in the upper part of the cylinder cannot be scraped back due to the improper fit between the two, which will immediately cause oil channeling. Similarly, the clearance between the piston ring bottom and the ring groove is also increased, which further increases the oil consumption, for the reasons described in #26. Different types of engines and different working conditions require different piston ring groups specially designed and manufactured. Each type of piston ring set is made for a specific purpose. If it is used in the wrong place, the oil consumption of the engine cannot be controlled. It is very important to use the correct piston ring set.

4. Engine high vacuum

With the improvement of modern engine speed, valve overlap angle and compression characteristics, the vacuum degree of the engine increases. Some new engines have a suction vacuum of up to 25 inches (635mm) Hg when decelerating (old engine design = 508mm Hg). High vacuum requires the development of new oil rings to effectively seal both sides (above and below) of the piston ring groove to avoid oil leakage from both sides and back of the oil ring during high vacuum and deceleration. This reason is often a major reason for blue smoke or high fuel consumption. Therefore, it is very important to use an oil ring with side face sealing ability when necessary.

5. Worn timing gear or chain

The wear of timing gear or chain will cause the timing of air valve and crankshaft to be out of synchronization. Due to excessive backlash caused by tooth or chain wear, the adjustment of the engine cannot be realized: the timing of the previous cycle may be different from that of the next cycle. When the movement of the air valve and the piston is not synchronized, it will cause excessive oil consumption. The reason is that excessive vacuum in the combustion chamber will draw in a large amount of oil and burn it off.

6. When installing the piston ring, the circumferential end face clearance is too small

When installing a new piston ring, it must be noted that at the minimum diameter of the cylinder, the piston ring still has enough circumferential end face clearance to compensate for thermal expansion. Generally, the clearance required for cast iron rings of vehicle engines is 0.003-0.005 inch / inch bore. Because it directly bears the combustion gas from the combustion chamber, the heating speed and working temperature of the piston ring are higher than those of the cylinder. The temperature of cylinder wall is low due to the action of water jacket. This means that the piston ring expands more, so there must be a gap to compensate - that is, the circumferential end face gap - otherwise, during engine operation, the end face of the piston ring will interfere with the cylinder wall and impact, resulting in scratch, adhesion and wear, resulting in increased fuel consumption. If the engine continues to run, especially when the load is heavy, the adhesive wear will be more serious. The end face of the piston ring is pressed inward to the piston ring groove, and the gap between the ring and the cylinder wall increases. The high-temperature and high-pressure combustion gas in the combustion chamber directly burns the lubricating oil on the cylinder wall along this channel, and the blowby gas enters the oil bottom, which greatly increases the oil consumption. Serious interference may even cause the piston ring to break, and the consequences are described in #27. Excessive circumferential end clearance of piston ring will also increase oil consumption.

7. Worn or broken piston rings

If the piston ring is broken or excessively worn, resulting in the failure to maintain the compressive stress and clearance, the excess oil will be sucked into the combustion chamber during the suction stroke, and the combustion gas will blow down along the piston during the power stroke. Both of them will cause the combustion and carbonization of engine oil at the piston, cylinder wall and piston ring. The broken piston ring is more destructive. The broken piece with sharp mouth is likely to cut into the side of the piston ring groove, causing the destruction of the ring bank and the complete damage of the piston. When the engine is overhauled, the worn piston ring should be replaced immediately rather than reused. The new piston ring has a quick positioning surface, which can immediately control the consumption of oil. Used piston rings, even if only slightly worn, cannot be properly positioned due to the polished surface, which will also lead to excessive oil consumption.

8. Piston ring sticking ring

Obviously, the piston ring with sticking ring cannot control the oil. Therefore, this situation should be avoided as far as possible. First of all, the installation of the piston ring should ensure the correct piston ring side clearance, so that the piston ring can still move in the ring groove at the operating temperature when the engine is working. In addition, ensure that all parts of the engine are clean and free of dust particles when the piston ring is installed. Otherwise, the piston ring may become sticky. Third, select oil products with excellent performance to reduce the formation of carbon deposition, oil sludge and paint film. Fourth, the oil should be changed regularly and the oil filter should be cleaned. Fifth, avoid overheating the engine.

9. Valve timing lag

The delayed timing of the air valve makes the closing time of the intake valve after the start of the suction stroke too long, and the vacuum in the cylinder increases, which increases the probability that the oil is sucked into the upper combustion chamber of the cylinder from the gap between the piston, ring and cylinder liner and burned.

10. Oil pressure too high

Incorrect oil pressure setting and failure of safety relief valve will cause excessive oil pressure. The result is that the engine is soaked with excessive oil, resulting in the same result as bearing wear.

11. Oil viscosity

The viscosity of the oil used is too thin, which may cause high oil consumption. Refer to the vehicle maintenance manual and select the appropriate oil viscosity according to the driving conditions and ambient temperature.

12. Piston design

Some of the latest engines have adopted new piston ring designs to meet emission requirements. Sometimes, this design will have a slight "knock" at start-up. Sometimes it will increase oil consumption.

13. Inner gasket / air inlet cracked

In the new engine design, various composite materials composed of metals and other materials are often used. Due to the difference of thermal expansion and cold contraction of different materials, thermal stress fatigue or fracture will occur in the packing and seal after long-time operation, which will also lead to the increase of fuel consumption.

14. Pre ignition knock

Most new engines are equipped with knock sensors to adjust the timing system to reduce emissions and improve engine power and performance. Pre ignition knock is caused by the pre ignition of fuel during combustion. Early ignition leads to the sharp rise of the pressure accumulated on the piston, destroys the normal movement of the piston ring, causes the sealing failure of the top and bottom sides of the piston ring, and finally leads to the increase of gas channeling and fuel consumption through the piston ring. Failure of the throttle position and flow sensor can also lead to failure.

15. The user's own modification to improve engine performance and the use of spare parts in inventory or the installation of modified parts to improve engine performance / power on the engine increase the possibility of high fuel consumption of the engine.

16. Engine lugging

Lugging refers to running the engine at low speed when high speed (higher power / torque) should be used, which will lead to greater pressure on the piston and increase oil consumption.

17. Improper overspeed operation

When the engine is not suitable for overspeed operation, there are many different reasons related to overspeed operation, which will lead to the increase of engine fuel consumption. These situations include crawling and frequent start and stop in urban traffic. Refer to reason 36.

18. Turbocharger seal leakage

The seal leakage of the turbocharger will suck the oil into the combustion chamber, burn it there and form carbon deposit, hinder the normal operation of the engine and further lead to more oil consumption.

19. High intake resistance

Excessive intake system resistance will increase the vacuum degree in the engine and increase the oil consumption, as described in item 24. An example of this is the severe blockage of the air filter.

20. Fuel dilution

If the fuel is not completely burned into the lubrication system, the oil will become thinner and more volatile, which will lead to higher oil consumption. Excessive fuel may enter the lubrication system and mix with engine oil due to fuel nozzle leakage, faulty fuel pump, high intake resistance or excessive idle operation.

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