Install the cylinder block so that its mating surface with the oil pan is facing up.
Checking the main bearing clearance
Clean the bearing shells and the recesses of the working surfaces in both the cylinder blocks and the main bearing caps. If new shells are installed, make sure that all traces of protective grease are removed. Wipe the bearing shells dry with a lint-free cloth.
Before installing the crankshaft, it is necessary to check the main bearing clearances, which can be done in two ways. First, you can install the main bearing caps in the cylinder block together with the bearing shells. After tightening the cap with the old bolts to the required tightening torque, measure the inside diameter of each assembled pair of bearing shells using a dial indicator or micrometer. If you measure the diameter of each crankshaft journal and then subtract it from the shell diameter, you will get the value of the main bearing operating clearance. Second (and more accurate) the method involves using an American product called Plastigage. It consists of a thin thread of perfectly round plastic material that is compressed between the bearing shell and the crankshaft journal. The deformed plastic material can be measured using a special scale supplied with the Plastigage kit.
Text was copied from the portal [OpelBook.ru]
Compare the width of the deformed Plastigage thread on each journal to the scale to determine the main bearing clearance.
Carefully remove all traces of Plastigage from the crankshaft and bearing shells.
Final installation of the crankshaft
Carefully remove the crankshaft from the cylinder block.
Lubricate the lips of the new rear crankshaft oil seal and rotate it on the rear of the crankshaft. Do this carefully, the sealing lips are easily damaged. Make sure the open side of the seal faces the inside of the engine.
Generously lubricate each bearing shell in the cylinder block and lower the VAZ crankshaft into place. Check the correct installation of the rear oil seal.
When seating the crankshaft, you can carefully tap it with a soft-shell hammer on the counterweight cheeks.
Lubricate the bearing shells, crankshaft journals, then install bearing caps NN 2, 3 and 4 and tighten the new bolts by hand as much as possible.
Fill the side grooves of the front covers (if required) and rear main bearings with joint sealing paste (vauxhall/Opel paste pan N 15 03 294 or equivalent) and apply sealing compound Vauxhall/Opel part N 15 04 201 or equivalent to the undersides of the bearing caps). Fit the bearing caps and tighten the new bolts finger tight as far as possible. Ensure that the front main bearing cap is flush with the end face of the cylinder block.
Working from the center main bearing cap outward, tighten the bearing cap bolts to specification in two stages.
After all bolts have been tightened completely, squeeze more sealing paste into the side grooves of the front wheel covers (if required) and rear main bearings and check that they are filled with paste.
Now you can turn the crankshaft and make sure that it rotates freely without jamming.
Check the crankshaft offset along the axis.
Install the pistons and connecting rods.
Install the oil pump.
Install the sump deflector (if required), oil supply pipe and sump.
Install the cylinder head.
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