Piston and connecting rod
1 - bolt, 32–35 Nm; 2 – connecting rod cover; 3 - the lower shell of the connecting rod bearing; 4 - the upper shell of the connecting rod bearing; 5 - connecting rod; 6 - piston pin; 7 - piston; 8 - oil scraper ring; 9 - compression ring No. 2; 10 - compression ring No. 1; 11 - bolt.
Withdrawal
Warning! Keep the connecting rod caps with the appropriate connecting rods for proper reinstallation in the engine cylinders.
1. Loosen the nuts and remove the connecting rod cap and the lower connecting rod bearing. For protection of necks of a cranked shaft put on bolts of fastening of covers of rods pieces of a rubber or plastic tube.
2. Use a block of wood or a hammer handle to push the piston and connecting rod out of the cylinder.
3. Disassembly and reassembly of the piston and connecting rod requires the use of special tools 09234-33001.
4. Install the universal supports in the clamp between the connecting rod and the piston.
5. Insert the puller through the hole in the arch of the clamp.
Warning! Insert the clamp with the piston, connecting rod and puller under the press slider.
6. Pull the piston pin out of the piston with a puller.
Examination
1. When installing, make sure the connecting rod and connecting rod cap match the cylinder number they are installed into. When installing a new connecting rod, make sure that the marks that determine its position are on the same side as the marks on the other connecting rods.
2. Replace connecting rod if both bearing surfaces are damaged. Also replace the connecting rod if there is wear or damage to the piston pin mating surface.
3. Check the bend of each connecting rod. If necessary, replace connecting rods. Replace the connecting rod together with the connecting rod cover.
- Allowable crank bend: 0.05 mm / 100 mm length
- Allowable crank twist: 0.1 mm / 100 mm length
Installation
1. Install the guide pins through the piston into the connecting rod, and install the piston pin on the other side of the piston.
Warning! The guide pins determine the position of the connecting rod in the piston. Once the piston, connecting rod, piston pin and piston pin insertion tool have been installed, the guide pins also determine their position in the clamp.
2. The guide pins determine the position of the connecting rod in the piston. Once the piston, connecting rod, piston pin and piston pin insertion tool have been installed, the guide pins also determine their position in the clamp.
3. Check the correct positioning of the piston and connecting rod and, by turning the knurled nut, secure the numbered bushing to the shaft.
4. Insert the shaft through the hole in the arch of the clamp. Press the piston pin into the connecting rod until the sleeve on the shaft contacts the top of the arch of the clamp, and the pilot pin should fall out of the piston.
Warning! The piston pin pressing force must not exceed 22500 N.
Pressing depth: 0.3–0.5 mm
5. Make sure the piston and connecting rod marks point towards the front of the engine.
6. After installing the connecting rod caps, check that the cylinder number on the connecting rod and cap matches the cylinder number.
7. When installing a new connecting rod, make sure that the bushing support notches are on the same side as the rest of the connecting rods.
8. Tighten the union nuts securing the connecting rod cap.
Tightening torque: 32–35 Nm
9. Using a feeler gauge inserted between the connecting rod and the crankshaft, measure the connecting rod backlash.
- Nominal connecting rod backlash: 0.10 - 0.25 mm
- Maximum allowable gap: 0.40 mm