all say that , BMW and Audi are also called oil-burning duo. I wrote about the oil burning case of Audi Volkswagen every day. Many friends protested with me and said that they wanted to see the case of BMW burning oil . I took the opportunity today and arranged!
This BMW X1 is equipped with an N46 engine with a displacement of 2.0. The magic machine of this BMW N46 that year was as common as the EA888 of the Volkswagen , and it was the main force of BMW's entry-level models. This BMW burns engine oil to what extent, 500 kilometers per liter. Speaking of this, many small partners must say, BMW burns the engine oil, can't it be solved by changing the auxiliary valve oil seal, is it really the case? No!
This is the classic old X1. In fact, I still like this BMW. It has an old-school style, which is in sharp contrast to the bells and whistles of the current BMW.
Back then, whether it was , Audi or BMW, the lines were simple and straightforward. I really liked the style of that era.
Vehicle ID card. A machine with no T and no direct injection can reach a power of 110KW, which only BMW can do.
The actual number of kilometers. When I wrote the article about Volkswagen EA888 , I said that one hundred thousand kilometers is a hurdle. Does this iron rule also apply to BMW?
Although my channel Audi Volkswagen is the main channel, but BMW, we have also repaired a lot, and it is easy to repair it.
Loosen all connecting harnesses and pipes,Prepare to sink the engine
After the engine is down, it is easy to disassemble it
Repair the engine, the duo is the best combination, more people are useless, one person I didn't take care of it, just two people.
Remove the valve cover, and found that the interior is still very clean, indicating that it is relatively timely to change the oil.
Remove the intake manifold
BMW's camshaft is equipped with dual VVT adjustment.
The eccentric shaft is actually fixed by a special tool, and I also have it at home, but sometimes, the soil method is convenient, and it is directly tied with a tie
Take off the entire eccentric shaft, Put aside
Remove the cylinder head
Continue to disassemble the cylinder block
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Disassemble the cylinder...
Take off the oil pan and prepare to disassemble the oil pump and balance shaft
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look at this piston,Although the gas ring does not match, the oil ring, which should have been staggered by 180°, is close to only 45°.
Look at the oil ring again, although BMW itself is not easy to be blocked by carbon deposits wave ring, not easy does not mean it will not, the carbon deposits are serious, and still blocked. This car is like this, the wave ring has been blocked by carbon deposits. In this case, the oil seal of the air exchange valve cannot solve the problem.
Let the master of the boring cylinder take things away for cleaning and processing.
This is the place for ultrasonic cleaning. Throw in all the black parts, take them out and rinse them, and they will become brand new.
Master unplugs the valve oil seal
The old oil seal has been severely worn. Although I said, this car light valve oil seal does not solve the problem, but the valve oil seal does not solve the problem. Up.
For this, we use reinforced valve oil seals, which are more resistant to oil and high temperature.
The most important thing is that this oil seal is a double-sealed oil seal with two seals for better sealing.
Check valve guide , perfect! BMW's valve guide is just one word, cow! Unlike Audi and Volkswagen, it is too loose for 100,000 kilometers. I really don't know what material it is made of.
The cylinder body is also cleaned
The Yuanbao beam that was originally polluted by oil,Perfect must also be brushed clean for him
Check the valve red mark, perfect!
Grind the valve to ensure the air tightness of the valve.
Replace with a new large tile and apply assembly oil to ensure cold start lubrication.
Put on the crankshaft
Check the valve pillars, and found that several of the pillars have been relieved and they can be easily moved.
Install the large tile cover.
According to the specified torque lock the cap screw
The opening direction of the piston ring must be marked, and the piston ring must be installed in accordance with the regulations _p
p0 p0 The ring itself is a wavy ring, and it doesn't matter whether it is improved or not. However, we have strengthened the air ring and used a highly airtight air ring.
Install balance shaft and oil pump
Use special tools to fix balance shaft
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turn the flywheel
install the crankshaft front oil seal
lift up the cylinder head,Tighten the cylinder head bolts according to a fixed torque.
The pressure relief top column must be replaced. Whether the engine sounds good or not depends on him.
Replace the top post
Install the camshaft
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install a new spark plug
bare engine basically looks like
The next step is to use the
special tool to lock
fix the two camshafts on one side
fix the signal plate with a tool in front, tighten the chain wheel bolts at 20 Nm + 90°
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On the other side , gearbox and Yuanbao beam have been washed to white, waiting to be combined with the engine
we will lift the assembled engine up
The two are perfectly connected
Arrange the wiring harness
After installing the exhaust pipe _p5
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0p imgSink the body, the engine and gearbox enter the cabin
Fix the bottom bolts, install the exhaust pipe
Connect the wiring harness and pipeline in the cabin
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Add Mobil engine oil, 0W40, which is in line with this engine
Clean the cabin, prepare to start, and just hit it.
After a while, the exhaust pipe began to emit water. Congratulations, the combustion is good, and the gasoline is completely burned.
Fill refrigerant R134
Brush the exhaust pipe with head water
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Go out for a lap first. At this familiar traffic light intersection, the young lady in the opposite KTV...
Of course, you can’t get too proud of yourself before you do four-wheel alignment. Go for the positioning first and then test the car.
Display city roads. N46 is a machine that naturally aspirates, accelerates and is linear. Although it is not as explosive as a turbocharger, it has an alternative feeling of pushing back.
is ready to go to high speed.
The high speed is very smooth,With a kick of the accelerator, it feels like a horse.
100 yards stable, proper. The condition of the engine is very stable, and I have a bottom now.
Although there is no turbocharged driving, it is really easy to overtake those trucks all the way.
Well, let’s go down east from Yongkang.
The high speed is very smooth these days, it is a good time to test.
Well, get off the highway from here, and the test run is complete!
Although I don't know the direct injection engine, I personally recommend the use of fuel additives. The additives for Mercedes-Benz, BMW, Audi, Land Rover and Porsche are actually from the same company, which is BASF.
After inspection, there is no fault code, all indicators are normal, and the vehicle is delivered!
finally make a summary. Although the machine of
N46 is no longer in production, after all, it had the title of arcade machine back then, and its possession is very considerable. For BMW to burn engine oil, we cannot simply think that changing the valve oil seal can solve the problem, and we can’t say anything about it. We have to dismantle and judge the final plan.
Regarding oil burning, one thing we often overlooked before is the amount of crankcase blow-by. Although BMW’s crankcase ventilation system is more reliable than Audi Volkswagen’s EA888, there is still a certain degree of incomplete separation. We are temporarily unable to change this immature ventilation system, but we can use piston rings. improvements,Reduce the amount of blow-by, thereby reducing the burden on the crankcase ventilation system.
In addition, the use of new material valve oil seals can also alleviate the early aging of BMW valve oil seals caused by high engine operating temperature, and to a certain extent alleviate the probability of recurrence of oil burning.
In short, in short. The same disease has different reasons, and the same is the burning of engine oil. The causes of BMW and Audi are different. We need to prescribe the right remedy for different reasons before the disease can be cured.
This is the end of this article. You are welcome to leave a message, like it, repost it, and pay attention to it. Thank you for your support.
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