Fist washers of a renovated diesel engine with certain gaps under the roller should provide specified fakes opening and closing of working and launch valves, as well as timely fuel supply. Riders under the rollers are set by manufacturers in adjusting tables for cold diesel engines so that when the rod of the valves is heated, they decrease to the desired size. If the gap under the roller of a cold diesel diesel is small, then when heated the stem will be lengthened so that the valve plate does not sit on the saddle and the gap forms between them. If the gap is large, then the valve opening angle will decrease and the work will occur with a knock and a lot of wear.
