Contents: Removal ↓ Installation ↓
To complete the work you will need:
- piston ring mandrel;
- torque wrench.
Removal
1. Remove the cylinder head (see "Cylinder head - removal and installation").
2. Remove the engine oil pan (see "Engine Oil Pan - Gasket Replacement").
3. Remove the oil intake (see "Oil intake - removal and installation").
4. Screw the crankshaft pulley mounting bolt back into place and, using a wrench, by 17 mm (on some cars by 19 mm) turning the crankshaft clockwise, we set the piston of the first cylinder to the lower position.
Tip: When loosening the connecting rod cap nuts, you may accidentally damage the oil level sensor, so it is advisable to remove it (see "Low Oil Level Sensor - Checking and Replacing").
5. With a socket wrench by 14 mm we unscrew the two nuts securing the connecting rod cover of the first cylinder.
6. Remove the connecting rod cover.
7. Place the hammer handle against the connecting rod and push it upward.
8. Remove the piston assembly with the connecting rod from the cylinder.
9. Remove the liners from the connecting rod and its cover.
Warning! When disassembling the connecting rod, do not press out the bolts from it.
10. Clamp the piston by the connecting rod in a vice.
11. Slightly moving the ring lock apart, remove the upper compression ring.
12. Remove the lower compression ring in a similar manner.
13. Remove the oil scraper ring...
...and its expander.
Warning! The advisability of replacing the rings depends on the degree of wear of the cylinders (see "Piston and connecting rod - replacement").
(The original is posted on Internet resource VAZbook.ru)
Installation
1. Carefully clean the piston from carbon and deposits. Inspect the piston and connecting rod. Cracks on them are unacceptable.
2. We select new rings in accordance with the piston diameter - nominal or repair size. There are no markings on the nominal size rings, repair rings are increased in diameter by 0.4 or 0.8 mm, and are marked "40" and "80" respectively.
3. Before installing new rings, use a set of feeler gauges to measure the gap between the piston ring and the wall of the groove into which the ring will be installed.
If the gap exceeds the maximum allowable value, the piston must be replaced.
Table 8.1.4. Permissible clearances between groove walls and piston rings
| Ring | Gap, mm |
| Upper compression ring | 0,04-0,07 |
| Lower compression ring | 0,03-0,06 |
| Oil scraper ring | 0,02-0,05 |
Oil scraper ring...
...and we install the upper compression ring with the inscription "VAZ" or "TOR" facing up.
We orient the lower compression ring so that its groove is directed downwards.
4. We put the rings on the piston as follows: by moving the ring lock apart (no more than is required to put the ring on the piston), we first place the lock on the piston, and then the back part of the ring.
We install new rings on the piston, starting with the oil scraper ring expander. After installing the oil scraper ring, the expander lock should be turned 180° relative to the ring lock.
After installing the rings on the piston, we turn their 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 by 180°, and the lock of the oil scraper ring by 90° relative to the lock of the upper compression ring.
5. Lubricate the piston, rings and inner surface of the cylinder with clean engine oil.
6. Place the mandrel on the piston and use it to compress the rings, periodically tapping the mandrel lightly with the hammer handle to ensure the rings are self-installing.
7. Wipe dry the places where the liners are installed in the connecting rod and cover and install the liners in the lower head of the connecting rod.
8. Lubricate the inner surfaces of the liners and the crankshaft connecting rod journal with clean engine oil. Turning the crankshaft, move the journal to the extreme lower position.
9. Install the piston on the block and orient it so that the arrow on the bottom of the piston is directed towards the crankshaft pulley (see "Piston rings and connecting rod bearings - replacement").
10. Pressing the mandrel against the block and tapping the bottom of the piston with the hammer handle, we press it into the cylinder, while simultaneously monitoring the movement of the connecting rod toward the crankshaft journal.
11. Install the cover assembly with the liner on the connecting rod and tighten its fastening nuts to a torque of 43.3-53.5 N·m (4.4-5.5 kgf·m).
Warning! Connecting rod caps are not interchangeable. The connecting rod and its cap indicate the cylinder number in which the connecting rod should be installed. On the assembled connecting rod, the numbers should be on the same side.
We replace the rings of the other three pistons in the same way.
After installing all the pistons, we assemble the engine in the reverse order of disassembly.