Hydraulic Valve Lift: Operation, Maintenance and Price

room Essential for the proper functioning of your engine, hydraulic valve lifters ensure the connection between the camshaft and the valves through cam action. They consist of two chambers in which the engine oil is pressurized.

🚗 What is a hydraulic lift used for?

Le hydraulic lift part of the car that allows you to tiecamshaft и valves motor. There are different types of hydraulic valve lifters, but they usually have two chambers that hold the engine oil pressure.

Indeed, the upper chamber remains in contact with the camshaft and slides into the lower chamber that contacts the camshaft. valve stem... The two chambers communicate with each other through a channel containing a pressure control valve.

Thus, when the hydraulic valve lifter is at rest and therefore has come does not press on it, the two chambers are repelled by the pressure of the oil circulating in the valve. Therefore, there is no play between the cam and the valve.

Conversely, when the hydraulic valve lifter is operating and therefore the cam presses against it to open the valve, the valve closes and prevents the upper chamber from sliding into the lower chamber due to oil pressure. The hydraulic valve presses the valve to open it.

?? What are the symptoms of the HS hydraulic valve lifter?

If your hydraulic pushers captured ou defectivethen you will hear clapping in the engine.

If the clicking sound only occurs when cold and disappears when hot, it is definitely care for discharge passenger oil. You can then use a special additive in your oil to loosen the hydraulic valve lifters.

If the clicking sound persists even when hot, the problem is undoubtedly faulty valve... After that, you will have to replace the hydraulic tappets.

Auto advice : To prolong the life of the hydraulic valve lifter, it is recommended to use only quality and approved engine oil. Also remember to change the oil regularly to avoid clogging the engine and hydraulic valve lifters.

🔧 How to change the hydraulic valve lift?

Replacing the hydraulic valve lifter is a complex operation that requires the dismantling of the motor. If you are not properly equipped or are not a mechanical expert, we do not advise you to change the hydraulic valve lift yourself.

Required material:

• Protective gloves
• Protective glasses
• Complete set of tools
• socket
• Torque wrench
• Machine oil

Step 1: Set the engine to top dead center (TDC).

Top dead center indicates the position at which the piston reaches the highest point of its stroke in the cylinder. Use the handwheel to find out the position of your pistons.

To change the position of the pistons, engage 3rd gear, then lift the wheel with a jack and finally turn the wheel clockwise. Then you will see how the rocker arms are activated and the pistons move. Turn until the first piston is at the top.

Step 2. Remove the timing belt.

Disconnect the timing belt from the camshaft pulley by loosening the tension roller. To do this, you will need to remove the belt guard.

Step 3: Remove the cylinder head cover.

Unscrew the nuts securing the cylinder head cover and remove it. Be careful not to lose or damage the cylinder head gasket if you wish to reuse it.

Step 4: Disassemble the camshaft.

Unscrew the bearing nuts two at a time, gradually loosening them one at a time. Do not completely unscrew one bolt unless the other is flush. After removing the bolts, the bearings and camshaft can be removed.

Attention : Be careful not to mix up the bearings as they must be assembled in the correct order. Indeed, the stages are numbered.

Step 5: Replace the defective hydraulic valve lifter

Now that the camshaft has been removed, you can finally remove the faulty hydraulic valve lifters and replace them with new hydraulic valve lifters. Be sure to immerse new hydraulic valve lifters in oil to refill them prior to installation.

Place the hydraulic valve lifters on the part in contact with the cam to prevent oil leakage and valve discharge.

Step 6. Assemble the various parts of the engine.

Once the new hydraulic tappets are in place, you can reverse the steps to reassemble. Use a torque wrench to tighten to the correct torque.

After reassembling everything, let the engine idle for about fifteen minutes to purge air from the hydraulic valve lifters. Also remember to check the engine oil level.

That's it, your hydraulic valve lifts have finally been replaced! If the engine continues to clap no matter what, it could be because the oil pump is not generating enough pressure.

Note : Given that you will have access to the inside of the engine to replace the valve tappets, it is recommended that you take the opportunity to replace the cylinder head cover gasket, tensioner roller, camshaft oil seal and timing belt at the same time if necessary.

?? How much does it cost to replace a hydraulic valve lift?

Replacing the valve lifter is a complex operation that requires opening the engine. Therefore, its price is relatively high and varies from one car model to another. Indeed, average from 200 to 500 euros replace the hydraulic distributor pushers.

Count only in part from 20 to 50 euros hydraulic valve lifter. Consider multiplying the price of a hydraulic lift by the number of lifts you need.

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