Remove the connecting rod cover along with the liner
Disconnect the remaining connecting rods from the crankshaft and move them up
We remove the liners from the connecting rods and their caps.
Using a 17 mm socket wrench, loosen the bolts securing the crankshaft main bearing caps
After unscrewing the two bolts, remove the rear main bearing cover. Two thrust half-rings are installed in the grooves of the rear crankshaft support. The front ring A is steel-aluminum, and the rear ring B is metal-ceramic. The rings can be removed by pressing on their ends with a thin screwdriver.
We unscrew the bolts of the remaining main bearing caps, keeping the crankshaft from falling. We remove the covers one by one and remove the crankshaft from the engine crankcase. All cover liners (except for the third one), installed in the main bearing beds, have a groove. The main bearing caps have marks corresponding to their serial number (counted from the toe of the crankshaft), facing the left side of the cylinder block. The fifth cover has two marks spaced along the edges.
To replace, remove the crankshaft main bearing shells from the cylinder block and covers. If wear or out-of-roundness is more than 0.03 mm, then the crankshaft journals must be ground in a specialized workshop where the necessary equipment is available (the axial runout of the main surfaces of the crankshaft must also be checked there). After grinding the crankshaft, we re-measure the diameters of the crankshaft journals to determine the repair size of the liners.
Using a micrometer, we measure the diameters of the crankshaft main and connecting rod journals and compare them with the data given in the table.
The main dimensions of the connecting rod and main journals of the crankshaft and their fillets
Installing the crankshaft on a car
- We wash the crankshaft in kerosene and blow through its internal cavities with compressed air. We install new crankshaft main bearing shells of nominal or repair size. On the outer cylindrical surface of the liners there are numbers stamped indicating the repair size: 025 - the first repair, for the crankshaft journal, reduced in diameter by 0.25 mm. Accordingly, for the second, third and fourth repair sizes the values will be: 050, 075, 100. It is easy to distinguish connecting rod bearings from main bearings. The upper main bearings (except for the middle one) have annular grooves. In addition, the middle support crankshaft bearings are wider than the others. The crankshaft connecting rod bearings are all identical and interchangeable; the diameter of the connecting rod bearings is less than the diameter of the main bearings. To increase the contact area, there are no annular grooves on the connecting rod bearings
- We install thrust half rings in the grooves of the fifth main bearing bed with grooves towards the crankshaft. Half rings are manufactured in normal thickness (2.310-2.360 mm) and increased thickness (2.437-2.487 mm)
- We check the axial clearance between the thrust half-rings and the thrust surfaces of the crankshaft, which should be in the range of 0.06-0.26 mm. If the gap exceeds the maximum permissible (0.35 mm), replace the thrust half-rings with new ones, increased by 0.127 mm.
- Lubricate the crankshaft connecting rod and main journals with engine oil and install the crankshaft into the cylinder block
- In accordance with the marks, install the main bearing caps and tighten their fastening bolts to a torque of 68.4–84.3 Nm. Checking the free rotation of the crankshaft
- We install connecting rods with liners and covers on the crankshaft. Tighten the fastening nuts to a torque of 43.4–53.5 Nm.
- Installing the engine sump on the car
- Install a holder with an oil seal on the cylinder block
- Installation of the remaining removed parts on the vehicle is carried out in reverse order.
- Adjusting the timing chain tension
- Adjusting the tension of the generator drive belt
- On a carburetor engine, we check and, if necessary, adjust the ignition timing
How to correctly determine ring sizes on Aliexpress.
Is it possible to find out the vehicle's equipment by looking at the fault code? How to find out the car's equipment
Ring sizes on Aliexpress for all sellers without exception are expressed in the American measurement system.
In order to choose the right ring size for yourself, you need to look at the ring size correspondence table offered by the seller in the product card. If you know your standard Russian ring size, then a simple and clear size table will tell you whether it corresponds to the American size. To do this, just select the Russian size, which is equal to the circumference of the finger in mm.
Otherwise, buyer will have to measure the finger circumference by themselves as shown in the pictures. The images may differ from one seller to another, but the procedure itself remains the same. You need to take a piece of thread or a narrow strip of paper and wrap it around your finger. Next, you should mark the circumference of your finger with a marker and lay a thread or paper with a mark to the ruler. Substitute the resulting number in mm into the table and determine the correct ring size.
What should you pay attention to when independently measuring your finger circumference? On the shape of your own fingers and the quite logical difference in the methods of measuring ring size in different Aliexpress stores. One Chinese store may offer to measure the circumference of the finger joint, another - the circumference of the phalanx under the finger
It’s better to take measurements of both, and then choose the greatest result. Otherwise, the purchased ring will either not fit on your finger, or it will be very difficult to remove.
By the way, the table of ring sizing charts from different sellers is slightly different. There's nothing to be done, China is China. Therefore, in order to determine your ring size, you can either choose the average value of ring size indicators, or use the grid offered by a specific seller.
Buying different types of rings requires an individual approach. It's good if your choice is a ring with a changeable size. Then you won’t have to fool yourself with determining the correct size, but simply bend the rim of the ring a little.
And when buying a Chinese copy of a very original Cartier Trinity triple engagement ring, you will have to choose one size larger than yours. This is required by the design features of the ring - three thin bands of yellow, white and pink colors are connected to each other in a special way. Each ring individually may fit you perfectly, but the rings that fit into each other will be too small for you because of this connection. In order to freely put on and take off such a ring without feeling discomfort, an additional size is required.
Before you finally decide on the size and choose a ring, you should also read customer reviews and, just in case, consult with the seller about the correspondence of the size chart to the actual dimensions of the product.
https://youtube.com/watch?v=PYg0aKo4k8k
The essence of the problem with ring sizes on Aliexpress
VAZ 2109 hood size
Considering that Aliexpress is an international platform and sells its goods in the Russian Federation, the USA, and Europe, the sizing charts of goods must comply with regional standards. The question arises - what ring size is indicated in the lot, in what international standard? And how can we convert this size into one that is familiar to us, buyers from Russia?
An additional complication stems from the traditional Chinese laissez-faire attitude toward the characteristics of their products. Especially if the product is not expensive, such as rings not made of precious metals. How to find out the exact ring size, not plus or minus a centimeter?
What are the sizes of rings in general (and what is the difference)
In Russia, the indicated ring size is its internal diameter in millimeters.
In Europe there are several internal standards, but now in most stores you can find out the size as the length of the inner circumference in the same millimeters. Accordingly, the European size is easily recognizable in the lot on Aliexpress. European size starts with numbers around 40 mm, and Russian ring sizes are numbers from 14 to 22. And it is easy to recalculate, ring circumference (European size) = 3.14*ring diameter (Russian size).
The situation is worse with English, American and Japanese ring sizes. The British generally use the letters of their alphabet to designate ring sizes. As a result, there is not enough mathematics to translate these dimensions. Ring size tables are used to determine compliance. They are not difficult to find on the Internet and we won’t bother you with it here. Let us present only one short table.
