How to tell if the valve oil seal is broken?

Hello, it is not difficult to judge, but you need to have some foundation, such as an understanding of how the engine works and more extensive experience in repairing the engine. Although both are burning engine oil, there are big differences in some details.

1. The piston ring wear or counter-mouth will cause the cylinder pressure to drop, and the pressure difference between each cylinder and any two cylinders will be recorded one by one after measuring with a cylinder pressure gauge as a reference.

2. Open the oil filler port or pull out the oil ruler, if the gas discharged from the filler port or ruler tube is stronger, combined with the cylinder pressure value recorded before, the pressure difference value can be preliminarily inferred from the piston ring, cylinder wear or piston ring counterpart. Damaged valve seals do not result in large amounts of pulsating gas coming out of the oil filler port or oil gauge tubes, as the proper valve seals do not directly affect the cylinder's sealing performance.

If the oil is burned due to a leak in the valve seal, the following will happen: after starting the car in the morning, a large amount of blue smoke will come out of the exhaust pipe (especially in the cold season), and after about five minutes, the smoke will disappear, but not during driving.

If there is blue smoke when the car is hot, it may be a piston or a cylinder. If it is just needed, it may be that the valve oil seal is damaged.

Does the vehicle with oil burn have to replace the valve rear oil seal? The correct way to check the valve seal is like this.

If the oil is burned due to the valve seal, the exhaust pipe will emit blue smoke during cold start in the morning, but there will be no blue smoke during normal driving or acceleration.

Disassemble the rubber tubing at the turbine outlet.

Or disassemble the hose in front of the throttle.

If there is a lot of oil on the surface.

It's that the turbine oil seal is worn.

For more information about the Volkswagen CC, please check Ekka.

With the elimination method, the cylinder pressure of all cylinders is first checked (to determine whether the piston rings are intact), if it is above the normal value, it can be suspected that the valve oil seal is broken, causing the engine oil to burn.

The exhaust cylinder emits green or blue smoke, and the engine oil is consumed a lot, in fact, you can go and check the valve oil seal.

The exhaust gas from the car is generally blue smoke and the taste is a little spicy.

The valve oil seal is broken, the intake valve is wet, and the exhaust valve has a thick carbon deposit.

Inspect the intake and exhaust tracts for heavy oil contamination.

Damn, look at the oil. Look at the pistons, too. Look at the cylinder head even more.

It can be identified by the following symptoms:

1. Cool car burning oil: You can observe whether there will be thick blue smoke from the rear exhaust pipe when you get on the car for the first time every morning. If there is, it is a cool car to burn the engine oil; If the blue smoke disappears after a while, there will generally be no similar situation that day.

2. Burn engine oil when accelerating: when the driver slams on the accelerator or steps on the accelerator when the vehicle is driving, a large amount of blue smoke is discharged from the exhaust pipe. If there is, it is to burn the engine oil when accelerating.

3. Fill the vehicle with the phenomenon of "burning engine oil" with engine oil, let the owner go to the maintenance station to weigh the oil filter after driving 1000 kilometers, and then fill up the engine oil, and then let the owner drive 1000 kilometers. Repeated 3 times, to obtain an average value, after the run-in period of normal oil consumption can generally reach 1000 kilometers liters, if the standard is exceeded, there is a situation of burning oil.

Blue smoke is a typical phenomenon caused by a faulty valve seal.

The main reason for burning engine oilThere is a problem with the fittings, the wastegas valve, the valve seal, the cylinder is pulled in the cylinder, and the cylinder pressure is insufficient.

If the oil circuit is not cleaned for a long time, the antifreeze is not replaced in time, the oil life cycle is too long, the piston ring is stuck, and the more common situation is that the piston ring is stuck.

What is piston ring seizureStagnation starts from the oil circuit, the oil bears the temperature at 110 degrees, and the high temperature caused by the long-term unclean oil circuit makes the oil at a temperature of 120 degrees or higher for a long time, so that the oil will fail in advance, the small hole of the oil ring is very small, and the oil inside will be dried and scabbed for a long time, and a cylinder stuck is a liter of oil for 5000 kilometers, at this time, the working conditions of other cylinders will also begin to be bad, and soon the 4 cylinders are stuck, and it will become a liter of oil for 1000 kilometers or even hundreds of kilometers.

SolutionAt present, there are two methods on the market to solve the problem, one is overhaul, and the second is PNF repair agent. In the case of overhaul, the cost is very high, the vehicle depreciates quickly, and the later run-in is also very troublesome. I've seen riders repair it with PNF repair agent before, you can refer to it.

Not a major overhaul to solve the problem of burning engine oil.

Summary and solutions for burning engine oil for various models.

There are three most direct consequences of valve oil seal damage:

1. The oil enters the cylinder along the valve guide rod, resulting in the acceleration of carbon deposition and oil pollution in the spark plug, the deterioration of working conditions or even non-working, and the reduction of engine power;

2. The valve tilt cylinder seal is not strict, the cylinder pressure drops, and the engine power is weakened;

3. Acceleration fuel consumption, which is easy to cause damage to the engine due to lack of fuel when the car is driving for a long time.

In addition, after the oil enters the cylinder to participate in combustion, some carbon is deposited in the oil, which makes the engine lubrication condition worse and aggravates engine wear.

What it does:

Stem seal is a kind of oil seal, generally made of outer skeleton and fluoroelastomer vulcanized together, and the diameter of the oil seal is installed with a self-tightening spring or steel wire for the sealing of the engine valve guide rod.

Valve seals can prevent oil from entering the intake and exhaust pipes, avoid oil loss, prevent gasoline and air mixtures and exhaust gas leakage, and prevent engine oil from entering the combustion chamber. Valve seals are one of the important components of engine valve packs. It comes into contact with gasoline and oil at high temperatures, so it is necessary to use materials with excellent heat and oil resistance, and are generally made of fluoroelastomers.

Symptoms of aging or damaged valve seals, engine oil burning, and blue smoke emitted from the exhaust pipe.

Second, carbon build-up in the spark plug causes the car to lose power.

Thirdly, the reduction in sealing performance will lead to insufficient pressure in the engine cylinders, and at the same time, the power of the vehicle will also decrease.

Fourth, the rate of burning engine oil is accelerated. In severe cases, the engine will lack cooling and lubrication, which will lead to pulling cylinders.

Does the vehicle with oil burn have to replace the valve rear oil seal? The correct way to check the valve seal is like this.

It's best to go to your car's 4S shop for professional personnel inspection to know what the specific situation is.

If the valve oil seal burns the engine oil, the exhaust gas of the exhaust pipe will generally appear to emit a relatively thick blue smoke, which means that the engine oil is burning. If the exhaust gas emits blue smoke, it is necessary to first eliminate the phenomenon of burning engine oil caused by the broken trachea, and if the oil leakage is caused by the valve oil seal, the valve oil seal is not tight in the combustion process, and the oil will generally appear thick blue smoke in the exhaust gas of the combustion process.

Valve oil seals. It is one of the valve seals on the engine, and the English is valve stem seal. Valve oil seal is generally made of vulcanized outer skeleton and fluorine rubber, and the diameter part is equipped with a self-tightening spring or steel wire, which is used for the sealing of engine valve guide rods, which is a kind of oil seal.

Since the valve seal works in a high-temperature and high-pressure environment, it is necessary to use materials with excellent heat and oil resistance. The commonly used materials for oil seals are: nitrile rubber, fluorine rubber, silicone rubber, acrylic rubber, polyurethane, PTFE, etc.