Removal the crankshaft
This operation is only possible after removing the engine from the car.
1. Disconnect the connecting rods from the crankshaft. If you only need to remove the shaft, you do not need to remove the head and remove the pistons with connecting rods.
2. Remove the oil pump and the crankshaft rear seal cover.
3. Using a feeler gauge, check whether the crankshaft longitudinal clearance is within the range of 0.07 to 0.17 mm. This can be done by inserting the feeler gauge between the central shoulder of the crankshaft and the support rings. Find out whether the support rings need to be replaced.
4. Check whether the markings defining the position of the main bearing caps are visible. It is important to install them in the correct order relative to the housing. The cap number must be visible.
The numbering should start from the first cylinder or the timing belt side. All numbers should be on the same side of the crankshaft, such as the main case air separator side.
5. Loosen the bolts and, lightly tapping with a hammer, move the liner cover and then remove it. Save the liners and support half rings according to their position relative to the cover
6. Remove the crankshaft from the main compartment, and then the remaining liners and support rings, keeping their position relative to the casing (housing) according to the marking.
Crankshaft inspection and repair
7. It is necessary to check for scratches and abrasions on the surface of the crankshaft journals and liners.
Using a micrometer, check the oval of all connecting rod journals. If it exceeds 0.017 mm, the crankshaft must be ground and the liners replaced with larger liners. Place the shaft on prisms and check the runout of the middle crankshaft journal. The permissible runout may be 0.03 mm. It is necessary to check the diameters of the main journals and crank journals. If they do not correspond to the permissible dimensions, the shaft must be sent for additional grinding.
8. Grinding of the crankshaft must be entrusted to a specialized workshop.
9. If the longitudinal clearance of the crankshaft exceeds the maximum value of 0.37 mm, it is necessary to replace the support half rings with larger half rings so that the clearance is reduced to the permissible value.
Crankshaft installation
10. Wipe the back of the main bearings, as well as the bearing seats in the block and in the covers.
11. Insert the main liners into the block body, as well as into the sockets of the covers and lubricate them generously with oil.
12. Lubricate the rear part of the support half rings with grease and glue them to the side of the central body of the main bearing and its cover. The half rings should be clamped so that their oil channels are facing outward.
13. Place the crankshaft on the liners, then install the main bearing caps according to the numbers. All numbers on the caps should be on the same side of the crankshaft. Note that if the cap with the half-liner is installed correctly, the half-liner tongues will be on the same side of the crankshaft. Before installation, the crankshaft should be washed, the oil channels rinsed and blown out, and the shaft journals wiped and coated with oil.
14. Insert the bolts and tighten gradually to the specified torque. Check if the crankshaft rotates freely. If the shaft rotates with difficulty, unscrew one cover at a time to determine the location of the required journal. It usually turns out that one of the journals is poorly ground. To verify this, you need to remove the shaft again and measure both the shaft journal and the hole in the housing together with the liners. The installation gap should be no less than 0.005 mm. Check the runout of the middle journal of the shaft and the cone of all journals.
Caution: Do not scrape off the bearings. Install the rear seal cover (item 6) and the oil pump, then install the connecting rods.
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