Lao Bao is 1.8 self-priming and has run 210000 kilometers. Engine oil consumes 1000KM/L. I pursue the performance of Mobil No. 1 engine oil, which needs about 14 liters for 10,000 km maintenance. Oxygen before burning engine oil clogging leads to high fuel consumption, poor power, valve cover oil leakage and oil bottom screw oil leakage. The consumption of gasoline and oil was so high that I made up my mind to control the burning of engine oil in mid-November.
Pre-plan forecast:
1. Burning engine oil is nothing but piston ring, valve oil seal (this car does not have a separate waste valve), full replacement, piston ring selection of the original car type or improved big wave, valve selection of Jinan valve, valve seal selection of 4S original parts.
two。 Disassemble the engine to check the piston, middle cylinder, size tile and crankshaft wear, replace and repair as appropriate and choose overhaul or medium repair (finally, due to poverty and performance, the reasons will be explained later)
3. Accessories choose as far as possible 4S shop original factory, followed by the major brands, the original car dismantling to find accessories is more troublesome, auto repair shop can not wait.
4. Plumbing and fittings choose the reinforcements on the market.
5. The protective layer of the rear circuit of the engine is aging and brittle. After checking the circuit is in good condition, the insulating material is selected to wrap it.
11.12 officially opened, blue paper tape is the connection position of various pipes and lines that I have recorded to prevent forgetting.
Let’s start with the main topic, the middle cylinder part:
Removed camshaft, regulator and other cylinder head accessories, this is the only remaining engine internal accessories photo, is it dirty?
After disassembling, the carbon deposition of one of the pistons, the elasticity of the piston ring is less, in addition to the carbon deposition to plug the return hole, the oil ring also loses its elasticity and tightly adheres to the piston. There is no tension at all (the cylinder pressure has been measured before, except one cylinder passed the slow pressure on the other three cylinders). The interior of the whole engine was clean, and the valve chamber was not slapped because of dirty hands, but
Here comes the point! Here comes the point! Here comes the point! There are 20 intake and exhaust valves, all of which are full of carbon on the back and positive area, which is a little thick, but there is only a tumor-like carbon deposit. It means that the valve oil seal can not hold, and the valve oil seal burns the engine oil!
In addition, the elasticity of the piston ring becomes worse, and the carbon deposition in the oil hole of the oil ring leads to the reduction of cylinder pressure and the failure of oil scraping.
The upper end of the middle cylinder liner has an obvious concave and convex shape, and the piston ring grinds the cylinder with a larger diameter.
In addition, discuss the advantages and disadvantages of boring cylinder lower sleeve with auto repair boss.
Advantages: boring cylinder lower sleeve, change piston, piston ring, can ensure the matching clearance between cylinder and piston, piston ring and piston clearance, up to the standard value. The air tightness is stronger, the gap is smaller, and it can ensure that the engine oil is not burned. Give you a warranty not to burn the oil.
Disadvantages: the sub-factory goods on the market are mixed, the accuracy of pistons and piston rings is general, the price is not high, but the quality is worrying. The original factory or 4S store goods are too expensive, I checked before the 4S piston ring a cylinder less than 700, plus thousands of pistons out, poor, can not afford to change.
Boring the lower liner of the cylinder, regardless of the quality of the cylinder liner, workshop work, do not know how the precision, anyway, it must be banging in. The most important reason is that when the cylinder liner is down, the cylinder liner will move at high speed. How much speed does it take to move? I don’t know how to move it. But how I drive violently, I know, unreliable, the middle cylinder of the cylinder liner permanently enlarged.
I finally chose medium repair, no boring cylinder, no lower sleeve, no piston change, because the middle cylinder is not dismantled, so the crankshaft connecting rod size tile does not move (tile wear is not very small). Although the auto repair factory does not guarantee the burning of engine oil, due to the good elasticity and air tightness of the new piston ring, it can improve a large part of the oil consumption. The timeliness needs to be tested. At present, the vehicle is driving for 21W km, and follow-up posts are posted to observe the timeliness.
It is said that this engine can bore the cylinder to 2.0L, replace the connecting rod piston crankshaft in the Passat field, and so on, and then burn the engine oil seriously, open the cylinder head and bore the cylinder 2.0.
The piston washed back has been equipped with an improved oil ring, the gas ring is still the same as the original car, and the gas ring on some treasure has been improved. Do not make recommendations to prevent advertising. The black part of the piston has been worn out, alas, anyway, the cylinder is already so big, it doesn’t matter if the piston is smaller.
Cylinder head part: there are no photos. First send to cleaning, valve guide, hinge, research valve, these are external processing, the owner of the garage sent 2 days to get back. Come back to replace the valve, valve oil seal, camshaft oil seal, in order to prevent the valve, the boss turned the cylinder head for nearly a day, we crouched in the cold and late autumn rain in Jinan, squatting in the boss’s simple workshop. Canopy roof, push and pull away the bracket, there is only one station), there is moderate rain outside, local light rain inside, local moderate rain, local heavy to rainstorm. He asked me to keep an eye on him, so he had time to change the plumbing.
I have wrapped the wire harness of the insulated aluminum tube package and the wire of the aluminum tube package with cloth tape. Bought online is said to be made in Germany, thick cloth base tape a roll. Afraid of not enough to buy a domestic roll, as a result, the German tape has not been used up. There was a mistake in the middle, and I took a German-made flannelette tape. Dozens of unjustified money has been spent.
This is the wire that I packed by myself, the replacement of water pipes and aluminum joints, and the replacement of exhaust gas circulation filter tubes when I took apart the valve chamber and piston for processing. The following picture is taken after the first fire, the exhaust pipe has obvious water droplets, the exhaust gas is very clean and smokeless, but after a few days of test driving for about 500 kilometers, there is obvious yellow engine oil attached to the transparent pipe.
It was taken after the first fire. The lower transparent pipe is connected with the waste gas pipe and the installed waste gas filter kettle, and there is obvious water vapor condensation.
The upper transparent tube is filtered and ventilated, obviously dry and clean.
The effect of the filter pot I bought is not ideal, so I stuffed the paper in the pot and the lower tube, the effect is direct and perfect, but the paper inside needs to be changed regularly. It turns out that I change the paper in the tube once a week, about 1000 kilometers, and add oil by the way. There is transparent glass on the pot that can be seen and changed when it is dirty. I forgot it last winter. When I opened the maintenance, I found that the mixture of oil and water was almost full. I don’t know why there is so much water in cold days.
The exhaust pipe has obvious water droplets, and the exhaust gas is very clean and smokeless, but after a few days of trial driving for about 500 kilometers, there is obvious yellow engine oil attached to the transparent pipe.
SamuelWard 
6 
September 12, 2024 
