Piston rings — removal and installation (Nissan Sunny B13)

Scheme of installation of rings on a piston

Piston ring joint arrangement

Installation

1. Before installing new piston rings, you need to check the gap in their joints. Lay out the pistons assembled with the connecting rods and the new piston rings in such a way that the set of rings corresponds to the cylinder in which the gap in the joint will be measured and in which the rings being checked will be installed.

2. Insert the top ring into the first cylinder and push it inward with the piston bottom so that the ring inside the cylinder becomes perpendicular to its axis. Push the ring to such a depth that the edge of the piston skirt is aligned with the split plane of the cylinder block, then remove the piston.





3. Measure the gap with a feeler gauge and compare the result with the standard specified in subsection 3.2.1.1.

4. If the gap is too small (which is unlikely if rings produced by Nissan are installed), then it should be widened. Otherwise, serious damage will occur due to the rings closing when the engine is running. It would be best to select new rings with a standard gap in the joint. At worst, the gap can be widened by carefully filing the ends of the ring joint with a thin file. To do this, clamp the file in a vice with soft jaws, move the ring so that the ends of the joint are on both sides of the file, and, slowly moving the ring, remove excess material. Keep in mind that the ring is very fragile and can easily break.

5. It is unlikely that the gap in new rings will be too large. If the gap is higher than normal, make sure that the ring corresponds to the given engine and cylinder size group.

6. Repeat the procedure for each ring of the first cylinder, as well as for the rings of the remaining cylinders. Keep rings and pistons corresponding to the same cylinder together.

7. After selecting the rings, measuring and adjusting the clearance, the rings can be installed on the pistons (see fig. Diagram of installation of rings on the piston).

Caution! Always follow the ring manufacturer's instructions, as different manufacturers recommend different procedures for installing rings on the piston. Do not confuse the upper and lower compression rings, which have different cross-sections.

For more information, see the website: nissanbook.ru



8. The oil scraper ring is installed first (the lowest on the piston). This ring consists of three parts. Install the expander into the groove.



9. Then install the upper and lower discs of the oil scraper ring in order between the expander and the piston groove areas.

10. Next, install the lower compression ring.

Please note: The upper and lower compression rings differ in cross-section.

11. Before installation, orient the ring correctly (the orientation marks on the compression rings must face upwards) and install the ring into the middle groove on the piston, while it is forbidden to spread the ring too much.





12. Install the upper compression ring in the same way, having first oriented it correctly. If the ring has a symmetrical cross-section, then position it so that the identification mark (indicated by the arrow) was facing upward.

13. After installing the rings on the piston, arrange the joints in accordance with Fig. Arrangement of piston ring joints.

14. Repeat these procedures to install the rings on the remaining pistons.