Possible malfunctions of hydraulic pushers, their causes and solutions
* The following reasons for increased noise in idle mode are possible, which increases with increasing crankshaft speed up to 1500 min-1 and is not associated with the operation of hydraulic pushers:
- increased clearances between valve stems and guide bushings;
- increased to a value exceeding the allowable value, valve and seat misalignment;
- non-parallelism of the ends of the valve springs;
- more than allowable runout of the valve head chamfer.