Information - Engine tappet

The pusher is one of the components of the valve control system. Due to its compactness, the maximum output power of the motor is achieved. There are two types of pushers – mushroom-type and hydraulic. The system also includes a pushrod and cams, valve lever, and finally the valve itself. The cams motion activate the pushers, and along with them, the pushrod. Thus, the tapped arm is activated, allowing the valve to open and, respectively, to close. As for modern cars, they are mainly provided with water cooled engines. It is also worth mentioning that the pushrods are located in a special recess in the cylinder block.

During the development process of the automotive industry, the valve control also underwent significant changes. In modern cars the pushrods are no longer used and the valve control is performed directly. One of the main advantages of this construction is the fact that in case of failure the parts of the system can be easily replaced. When it comes to problems with constructions, which still perform the valve control using pushers and rods, the car must be taken to a repair shop for a general check-up, in order to determine the cause.

If your car has a rod or pusher failure and needs repair, do not try to fix it yourself, it will be better to have an expert to take a look at it. Finding the cause and replacing the damaged parts are very complicated processes, so save your time, take the car to a mechanic. Our online store will help you to save not just time, but also money.

We offer a huge range of products and best prices for parts. Whatever you want to buy - working cylinders, stationary roller bearings or struts - all that you can order without leaving your home or office.

What you need to know about hydraulic valve adjuster replacement: lifetime limit, common defects and their signs, tips and recommendations

An average service life of the hydraulic valve adjuster which is also called the hydraulic tappet is 120 000 - 150 000 operational kilometers. Lifetime limit of this component mostly depends on oil used and timeliness of its replacement.

Presence of hydraulic lash adjuster defects is pointed by knocking sound in the running engine. As there are several hydraulic valve adjusters installed in the engine, it is important to determine which one is out of order. Professional diagnostics of this element requires special equipment such as a stethoscope. If you don’t have necessary experience and skills in working with the engine, then this procedure should be entrusted to service station professionals.

In order to replace the hydraulic valve adjuster you should also address to specialists. It requires thorough knowledge of the engine construction and the sequence of its demounting and assembling. Furthermore, mistakes at hydraulic valve adjuster replacement can lead to serious violations in engine work.

Advices for our customers

How to replace hydraulic tappets yourself?

It is strongly prohibited to replace the hydraulic tappets with your own hands: special equipment is required for their demounting, and for some cars you will need to remove and disassemble the engine. Moreover, together with installation of new hydraulic valve adjusters you will need to flush the engine lubrication system, replace oil and the filter. These are quite difficult and laborious procedures, which are better to entrust to professionals. It is not advisable to delay hydraulic tappets replacement: their improper operation leads to premature wear-out of the camshaft and the valve actuating arms, and can be the cause of engine power lowering.

Why may hydraulic tappets knock? How to define which exact hydraulic valve adjuster knocks?

The hydraulic tappets can knock due to various reasons. If their knocking appears only at the cold engine, this means that the supply of lubricant to the hydraulic valve adjuster is troubled. This may occur as a result of oil excessive viscosity, failure to keep to its replacement schedule, clogging of intake channels and oil filter, defectiveness of the oil pump. If the engine has been warmed up, but the valves are still knocking, it’s most likely that the hydraulic tappet itself is broken down due to wear-out or soiling. In this case the part should be replaced. In order to define which exact hydraulic valve adjuster knocks, use a phonendoscope. It happens so, that knocking continues to occur after replacement of the components. This may be caused by errors during installation of the hydraulic valve adjusters, clogging of the engine oil channels, or improper operation of the oil pump.

How to examine hydraulic valve adjusters and define their defects?

In order to examine the hydraulic tappets for operability you will need a phonendoscope. Put its receptacle to each of the hydraulic valve adjusters at operating engine, one after one. Faulty components can be detected by specific knocking. Demount the defective parts and install new ones to their places. Consider the fact that even properly functioning hydraulic valve adjusters may knock if the engine is not warmed up. But after they have been filled with oil, the knocking has to stop. Components defects can also be detected by indirect signs, such as intermittent or increased noise at idling, which disappears after reaching of high engine rpm, as well as constant noise of a few valves, which is independent of engine operation mode.

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