![]() None of the signs on this list are 100 percent evidence of worn caps. It is important to make sure that the driving behavior of the driver does not change towards an aggressive style. With good ignition and fuel supply systems, fuel consumption has increased significantly.In a more neglected state, the smooth operation of the engine at idle is lost.Read more about the types of carbon deposits in separate review. Carbon deposits appeared on the electrodes during periodic replacement of the spark plugs.This affects the compression, which leads to a decrease in the performance of the internal combustion engine. Due to heavy carbon build-up, the valves do not close tightly.When the driver presses the accelerator, thick gray or black smoke escapes from the exhaust pipe, which is not caused by a cold engine start in winter (this factor is explained in detail here).This is due to the fact that the cap does not collect the lubricant, but it enters the cylinder chamber. However, oil must not enter the cylinder cavity. In order for the gas distribution mechanism to work without premature wear of the rubbing parts, it must constantly contain motor lubricant (how the timing mechanism works and how it works is described in a separate article). Preference should be given to options from acrylate or fluoroelastomer. If you buy a budget set of caps, you can end up on low-quality items made from a less stable material. No special tool is required to replace such modifications. Also, they are not in direct contact with the guide sleeve, therefore, the mechanical load on the cap is less. These parts are more reliable, since they do not experience such temperature stresses as previous analogues. This element fixes the cap and also presses its edges, ensuring a stable sealing of the head in this part. The only problem is that dismantling requires a special device. They cost less (compared to the next modification) and can be quickly replaced. It is pushed onto the valve stem and inserted into its guide. The valve stem can be made in two different designs: Since they are made of elastic material, they wear out as a result of constant mechanical and thermal stress, as well as exposure to engine oil. Both effects can be achieved with rubber bushings. But at the same time, due to constant friction, the rod must receive the necessary lubrication. When the valve opens the corresponding hole, it must be dry. ![]() The number of these parts is identical to the number of valves.
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