2. Before installing new piston digs, check the gap in the track lock as follows.
3. Lay out the piston rings and pistons with connecting rods in order so that during the assembly process they do not get mixed up with each other and fall into their cylinders. Place the block on the workbench with the crankcase down so that the cylinders are accessible from above and below.
4. Insert the first upper piston ring into the first cylinder and push it down with the first piston, thus positioning the ring perpendicular to the cylinder walls at the bottom of the cylinder. Remove the piston.
5. Measure the gap in the lock using flat feeler gauges and compare with those given in Specifications. A properly selected probe should come out of the lock with slight friction. Make sure the ring is installed correctly before deciding that the gap is not correct. Repeat the operation with the remaining rings of the cylinder.
6. If the clearance is too small (as if spare parts from non-professional manufacturers are used), it must be expanded, otherwise, during the operation of the engine, the ends of the ring will close, leading to serious damage. Ideally, new piston rings should provide the required clearance and be ready for installation. At worst, you can increase the gap by removing a lot of metal from the end of the ring with a thin file. Clamp the needle file in a vise with soft jaws and drive the end of the ring along the needle file, holding it strictly perpendicular, removing the required amount of metal. Be careful, the ring is sharp and fragile.
7. Now that the rings have been checked and the gaps adjusted, you can install them on the pistons. When installing the rings, the same technology is used as when removing them. Install the oil scraper spring in the third groove first, then install both thin oil scraper rings on the edges of the groove. The second and first rings differ from each other, they can be distinguished by the ends; the upper one has a square section, and the second one is trapezoidal. Install both rings in their grooves with the TOP mark up.
8. Spread the locks of the rings at an angle of 120°.
Note. Always follow the manufacturer's instructions when setting the gauge - different manufacturers may give different instructions.
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