Arrangement of joints of piston rings
1. The upper disk of the oil scraper ring; 2. Top compression ring; 3. The lower disk of the oil scraper ring; 4. Lower compression ring; 5. Oil scraper ring expander; 6. Notch (towards the front of the engine)
Installation
1. Before installing the pistons with connecting rods, the surface of the cylinder must be absolutely clean, the edges of the cylinders must be chamfered, and the crankshaft must be installed in the cylinder block.
2. Disassemble the connecting rod of the 1st cylinder. Wipe the back of the new upper connecting rod bearing and place it in place on the connecting rod. Make sure the tab on the bushing fits into the groove in the connecting rod and the lubrication holes line up. Do not lubricate the insert. Install the bottom bearing into the connecting rod cap in the same manner.
3. Arrange the joints of the piston rings in accordance with the diagram (see fig. Arrangement of joints of piston rings).
4. Put the hoses on the connecting rod bolts. Lubricate the pistons and rings with clean engine oil, compress the rings with a tool, leaving a protruding section of the piston.
5. Turn the crankshaft to BDC in the first cylinder, lubricate the cylinder walls with engine oil.
6. Orient the piston so that the notch is facing the front of the engine.
7. Carefully insert the lower part of the piston with the connecting rod into the first cylinder until the tool rests on the cylinder block. Lightly tap the top edge of the mandrel to evenly contact the plane of the cylinder block.
8. Insert the piston into the cylinder by gently tapping the piston head with the wooden handle of the hammer. Don't put in a lot of effort. If resistance is felt, immediately stop laterally and remove the cause of the binding.
9. Pull the connecting rod to the crankshaft journal and check the clearance in the connecting rod bearing. The inspection procedure is no different from the procedure for main bearings (see subsection 3.3.7.8). Rotation of the crankshaft or the slightest ingress of oil on the liners during measurements is not allowed.
10. Tighten the connecting rod cap nuts to the specified torque with a thin-walled socket (to prevent the head from jamming between the nut and the connecting rod cap. If the clearance is not correct, check that there is no grease or dirt, and again check the diameter of the neck and the correct selection of the connecting rod bearing.
Final assembly
1. Carefully remove the remnants of the caliber, lubricate the liners and crankshaft journal, install the cover and tighten the nuts evenly in 3 steps to the specified torque.
2. Repeat these steps for the rest of the connecting rods. Check the freedom of rotation of the assembled crankshaft.
3. After the final installation of pistons with connecting rods, check the freedom of rotation of the crankshaft.
4. Check the end play of the connecting rod (see subsection 3.3.7.7). Keep in mind that after installing new connecting rods, the play may be less than normal and grinding of the connecting rods will be required.
5. Assemble and install the engine following the relevant sections.