2. Lay out the pistons with connecting rods and new track sets so that the groups of parts are together during and after checking the gaps in the locks.
3. Take the #1 piston top compression ring and insert it from the top into the first cylinder. Push it down with the bottom of the piston - this will ensure that the position of the ring is perpendicular to the walls of the cylinder. Position the ring at the bottom of the cylinder, approximately where it would be when the piston is at bottom dead center. Remember that the top and second compression rings are different. The second compression ring is easily distinguished by the presence of a step on the bottom surface.
4. Measure the thermal gap in the lock of the ring with a feeler gauge.
5. Repeat the measurement in the upper position of the ring (pic. 16.5). Compare the measurement results with the values in the Technical data section.
6. If the clearance is too small (which is unlikely). it must be increased, otherwise, during engine operation, the ends of the ring will rest against each other, which. likely to cause serious engine damage. You can increase the gap by carefully filing the ends of the ring with a small file. Clamp the file in a vice with soft jaws and drive the ring over the file. Be careful - the ring has sharp edges. The ring is also very fragile - it can be easily broken.
7. If the rings are new, then the gap in them is unlikely to be too large. If this still happened, check whether the rings are correctly selected and matched to your engine.
8. Repeat similar measurements for the remaining rings of cylinder No. 1, and then for the remaining cylinders. Don't forget about that. that the cylinder - piston - rings form a single set.
9. After the check and. if necessary, adjusting the gaps in the locks, the rings can be installed in the pistons.
10. When installing the rings, use the same technology as when removing them. Install the lower oil scraper ring first. When installing a three-piece oil scraper ring, first insert the expander, then the lower ring, turning its lock away from the expander lock by 120°. After that, insert the top ring and turn its lock 120°relative to the lock of the lower ring. If the oil scraper ring consists of two parts, install the expander first, then the ring. Expand the gaps of the expander and ring at an angle of 180°. The second and upper compression rings differ from each other in cross section. The section of the upper ring is symmetrical, while the second ring has a stepped section with a step on the lower surface. As a rule, the upper side of the second ring has a TOP mark, or a dot applied with paint. Insert the second ring, taking into account its distinctive features. Then insert the top ring either side up (pic. 16.10, a, b). After installing the compression rings, turn the locks at an angle of 120°in both directions relative to the oil scraper ring lock. Follow only that. so that the track locks are not over the pin hole.
Pic. 16.10, a. Piston rings 4-cylinder engine
1 Top compression ring
2 Second compression ring
3 Oil ring (three details)
Pic. 16.10.6. Piston rings 6-cylinder engine
1 Top compression ring
2 Second compression ring
3 Oil ring (two details)
Comment. Always follow the instructions that come with new rings - different manufacturers may prescribe different procedures. Do not confuse the first and second compression rings - they have a different cross section.