Removing
1. Remove the cylinder head from the car (see "Cylinder head - removal and installation").
2. Remove the engine oil pan (see "Engine oil pan - removal")
3. Remove the oil receiver (see "Oil receiver - removal").
4. Turning the crankshaft by the bolt securing its pulley with a 17 mm key, set the piston of the first cylinder to the lower position.
5. Using a 14 mm socket wrench, unscrew the two nuts securing the connecting rod cover of the first cylinder.
6. Remove the connecting rod cover of the first cylinder.
7. Having rested the hammer handle on the piston, we push it up.
8. Remove the piston from the cylinder.
9. Remove the connecting rod bearings from the connecting rod and cover.
Warning. When disassembling the connecting rod, do not press the bolts out of it.
If there are signs of heavy wear on the connecting rod journals of the crankshaft, then it is necessary to remove the engine and repair the crankshaft (see "Engine - repair with complete disassembly").
10. We fix the piston by the connecting rod in a vice.
11. Slightly spreading the lock of the ring, remove the upper compression ring.
12. Similarly, remove the lower compression ring.
13. Remove the oil scraper ring...
...and its expander.
Warning. The expediency of replacing rings depends on the degree of wear of the cylinders and pistons (see "Piston and connecting rod - replacement").
Installation
1. Thoroughly clean the piston from carbon deposits and deposits. We examine the piston, connecting rod and pin. Cracks are unacceptable.
2. We select new rings in accordance with the piston class (see point 5 "Piston and connecting rod - replacement").
Note. There are no markings on piston rings of nominal size, repair piston rings are increased in diameter by 0.4 or 0.8 mm, and are marked «40» and «80» respectively.
3. Before installing new piston rings with a set of probes, we measure the gap between the piston ring and the wall of the piston groove into which the ring will be installed.
If the gap exceeds the maximum allowable, then the piston must be replaced.
Oil scraper piston ring...
... and install the upper compression ring with the inscription «VAZ» or «TOR» up.
We orient the lower compression ring in such a way that it is directed downwards with a groove.
4. We put the piston rings on the piston as follows: by expanding the piston ring lock (no more than is required to put the piston ring on the piston), we start the lock on the piston first, and then the back of the piston ring.
We install new piston rings on the piston, starting with the oil scraper ring expander. After installing the oil scraper ring, the expander lock must be rotated 180°relative to the piston ring lock.
After installing the piston rings on the piston, we turn them with locks so that the lock of the upper compression ring is located at an angle of 45°to the axis of the piston pin, the lock of the lower compression ring is turned 180°, and the lock of the oil scraper ring is 90°relative to the lock of the upper compression ring.
5. Lubricate the piston, rings and cylinder mirror with fresh engine oil.
6. We put the mandrel on the piston and compress the rings with it, periodically tapping the mandrel for self-alignment of the piston rings with the hammer handle.
7. We wipe dry the beds of the connecting rod bearings in the connecting rod and the cap and install the liners in the lower head of the connecting rod.
Note. The selection of connecting rod bearings for the crankshaft journals is shown below (see table. 8.1.34). If the crankshaft has not been bored, it is advisable to replace the connecting rod bearings with new, nominal size.
8. Lubricate the inner surface of the connecting rod bearings and the connecting rod journal of the crankshaft with clean engine oil. By turning the crankshaft, we move the neck to the lowest position.
9. We install the piston on the block and orient it so that the arrow on the piston bottom is directed towards the crankshaft pulley (see "Piston and connecting rod - replacement").
10. Pressing the mandrel against the block and tapping the piston bottom with the hammer handle, we sink it into the cylinder, while simultaneously monitoring the progress of the connecting rod to the crankshaft journal.
11. We install a cover on the connecting rod and tighten the nuts with a torque of 43.3-53.5 Nm (4.4-5.5 kgf-m).
Warning. The connecting rod caps are not interchangeable. The connecting rod and its cap are marked with the number of the cylinder in which the connecting rod is to be installed. On the assembled connecting rod, the numbers should be located on one side.
12. We replace the piston rings of the other three pistons in the same way.
13. After installing all the pistons, we assemble the engine in the reverse order of its disassembly.
Table 8.1.34. Repair dimensions of the crankshaft journals
Crankshaft journal dimensions | Crankshaft journals | Crankshaft journals |
Denomination 1 repair (- 0,25) 2 repair (- 0,50) 3 repair (- 0,75) 4 repair (- 1,00) |
50,799 - 50,819 50,549 - 50,569 50,299 - 50,319 50,049 - 50,069 49,799 - 49,819 |
47,83 - 47,85 47,58 - 47,60 47,33 - 47,35 47,08 - 47,10 46,83 - 46,85 |