If a constant knock of valves is heard when the engine is idling, the hydraulic bearings of the drive levers are faulty. Replace defective hydraulic bearings

You will need: keys "for 10", "for 13", "for 17", "for 24"

Remove the cylinder head cover (see "Replacing the cylinder head cover gasket").

Check the hydraulic bearings, for which press the valve drive levers one by one, trying to drown the plungers of the bearings.

Check the hydraulic bearings by pressing the valve levers one by one

The force of sinking the plunger of a serviceable hydromount is quite large, while for a faulty one, on the contrary, the plunger is easily pushed in.

Dip the chain tensioner plunger with a metal rod (for example, a screwdriver)

While turning the crankshaft, align the mark on the camshaft sprocket with the mark (lug) on ​​the camshaft bearing housing (see "Checking and setting the valve timing by marks").

Press the plunger of the chain tensioner with a metal rod (for example, a screwdriver), unscrew the bolt securing the camshaft sprocket (see "Replacing the camshaft drive chain damper") and, holding the tensioner plunger, remove the sprocket from the camshaft without disconnecting it from the chain .

Replacing the VAZ-2123 engine hydraulic mount

remove the sprocket from the camshaft

Make sure the chain does not disengage from the oil pump drive shaft sprocket.

Replacing the VAZ-2123 engine hydraulic mount

VAZ-2123 engine hydraulic mount replacement

Attach the sprocket and chain to the engine.

Unscrew the stud nut of the camshaft bearing housing, which simultaneously fastens the fitting of the oil supply pipeline to the hydraulic bearings, and remove the fitting from the stud

Replacing the VAZ-2123 engine hydraulic mount

VAZ-2123 engine hydraulic mount replacement

Pull the pipeline aside by gently turning it in the rubber o-rings of the ramp legs.

Unscrew the remaining nuts securing the camshaft bearing housing, remove the flat washers located under them

Remove the bearing housing together with the camshaft from the cylinder head studs.

Replacing the VAZ-2123 engine hydraulic mount

Replacing the VAZ-2123 engine hydraulic mount

To facilitate the reinstallation of the bearing housing with the camshaft, after removing them, try not to turn the shaft in the housing.

Remove the valve actuator lever.

VAZ-2123 engine hydraulic mount replacement

Removing the VAZ-2123 engine cylinder head hydraulic mount

Unscrew the hydraulic support

Remove it from the holes in the cylinder head and ramp post.

In the same way, we dismantle the hydraulic bearings of the levers of other valves.

Replacement of VAZ-21214 engine hydraulic mounts

Remove the frame for supplying oil to the hydraulic bearings.

VAZ-21214 engine hydraulic mount replacement

Replacing the VAZ-21214 engine hydraulic mount

We move the oil-supplying sleeve of the hydraulic support from the frame tube and remove it.

VAZ-21214 engine hydraulic mount replacement

Replacing the VAZ-21214 engine hydraulic mount

Similarly, we remove three more hydraulic bushings

The tightness of the connection between the frame tube and the oil supply bushings is ensured by rubber sealing rings installed in the bushings.

In the extreme bushings, one sealing ring is installed, in the other - two.

To replace the sealing ring, pry it with a screwdriver and remove it from the sleeve.

Before assembling, we clean, rinse with gasoline and blow with compressed air the channels in the tube and oil bushings of the frame.

We install new sealing rings in the bushings and lubricate them with engine oil.

Carefully, so as not to damage the rings, we put the bushings on the tube.

Before installing a new hydraulic bearing, pump out the accumulated oil from the hole in the cylinder head.

pump out accumulated oil from the hole in the cylinder head

If the oil is not removed from the hole in the head of the block, the hydraulic support cannot be completely screwed in, and the valve actuator will not work normally.

Install the valve actuator lever and camshaft in the reverse order of removal.

Tighten the camshaft bearing housing nuts in the sequence shown in Figure 23.

Camshaft bearing housing nuts tightening order

Sink the plunger of the replaced hydraulic bearing, as was done during the test, until there is a gap between the valve lever and the camshaft cam.

Install all previously removed parts in the reverse order of removal.