The hydraulic pusher is part of the timing system. Its task is to compress the clearance created as a result of temperature elongation and wear of individual elements of the timing system. In addition, they eliminate the lateral forces that act on the valve stem. They are extremely sensitive to the quality of the oil and its purity, which is why the right choices as to the specifics used are so important. What are the most common causes of failure of this element and how to prevent it? Suggestions!
After driving 100,000 km, it is recommended to replace the hydraulic elements that are responsible for compressing the valve clearances. Lack of uniform operation of valves can lead to failure. Therefore, when replacing hydraulic tappets or a hydraulic shaft, we must remember that these elements are replaced simultaneously during one repair.
Filling
Hydraulic pushers, which are used as spare parts, are usually filled with oil when they leave the factory, the amount of which is sufficient only for starting. On the driver’s side is therefore filling them with engine oil.
If the components have been pre-filled with oil, you will not hear their work at the first start. However, if you hear a knock, it means that there has been a self-venting.
Noises in pushers
Start-up noise is the norm. However, they should stop quickly. However, knocking during the operation of a heated machine may be a cause for concern, which may be the result of poor lubrication of the system. In turn, the reasons for this state of affairs may be contaminated oil blocking pistons, its too high or low level, but also leaks in the oil pump or too low pressure. Noise can also be caused by the pumping effect of the hydraulic component, damaged or poorly selected springs, defects in valve guides or mandrels, or excessive engine speed.
Contaminated engine oil negatively affects the operation of hydraulic tappets. The components that work with them also have a low tolerance to dirt, so it is important to change the oil regularly. To keep it clean, it is worth using an additive to engine oils. Thanks to the ceramic layer created by the preparation, all pistons and rings run smoothly. Starting a cold engine is easier, so we can eliminate tapping in the engine. The addition to Ceramizer engine oils helps to keep the engine clean, and reduces friction on friction surfaces, thus having a beneficial effect on hydraulic pushers. By pushing through the pusher channels, it restores their efficiency and eliminates noise.
Control
In addition to pure oil, optical control of the condition of hydraulic components is also important. Damage such as scratches, pitting or casting defects can be immediately recognized. Then it is necessary to replace – it is best in this case to contact the mechanic – independent attempts may end in failure. It is also important to control valve clearances – they are of great importance for the proper operation of the timing.
Another way is manual control – for this you just need to squeeze the pusher. For some, this may be difficult, but it is nevertheless possible – the greater the resistance in squeezing, the better the condition of the pusher. If you can do it easily, it is a signal to replace the element with a new one. The operation itself should not be expensive, but it is worth it for a professional to assess the situation.
Hydraulic tappets are important components in your car. Their smooth operation should run smoothly, which is why it is so important to take care of clean oil. An addition to engine oil will certainly help you with this. Remember that in the event of a breakdown, the camshaft should also be replaced. Only then will you be able to enjoy a fully functional car.
