1 - camshaft pulley; 2 - bolt, 80–100 Nm; 3 – a sealing ring of a camshaft; 4 - front bearing cover; 5 – a camshaft of inlet valves; 6 - bolt, 8–10 Nm; 7 - central cover; 8 – a cover of a head of cylinders; 9 - gasket; 10 – a back cover of the bearing; 11 - chain; 12 - exhaust camshaft; 13 - hydraulic valve clearance compensator.
Withdrawal
1. Disconnect the crankcase ventilation hose.
2. Remove the water pump pulley and crankshaft.
3. Remove the toothed belt cover.
4. Pull the toothed belt tensioner towards the water pump and temporarily secure it in this position.
5. Remove the toothed belt from the camshaft pulley.
6. Loosen the screws and remove the center cover.
7. Remove the ignition coil block.
8. Turn out bolts and remove a cover of a head of cylinders.
9. Remove the camshaft pulley.
10. Remove the camshaft bearing caps and chain.
11. Remove camshafts.
12. Remove the hydraulic valve clearance compensators.
Examination
1. Check the camshaft for uneven wear, cracks or damage.
2. At two points, measure the height of each camshaft lobe.
- Nominal height of intake camshaft lobes: 43.4483 mm
- Nominal exhaust camshaft height: 43.8489 mm
- Minimum allowable height of the intake camshaft cams: 42.9484 mm
- Minimum allowable exhaust camshaft height: 43.3489 mm
3. Check the cam surfaces for uneven wear and damage.
4. Check each bearing for damage. If the bearing surface is excessively damaged, replace the cylinder head or camshaft bearing cap.
Camshaft end play: 0.1–0.2 mm
Camshaft front O-ring
1. Check sealing ring lips for wear. If the lip is worn or damaged, replace the O-ring.
2. Check the surface of the camshaft in contact with the O-ring. If this surface is evenly worn, replace the camshaft.
Hydraulic valve clearance compensators
Fill the hydraulic valve clearance adjuster with engine oil, hold it vertically and squeeze it on both sides with your fingers.
The main malfunctions of hydraulic valve clearance compensators, causes and methods of elimination are given in the table.
Malfunction | Possible reasons | Elimination Method |
Intermittent noise when starting a cold engine. | Normal phenomenon | The noise disappears after the engine oil warms up and normal pressure is reached |
Continuous noise after the engine has not been started for 48 hours. | Oil has leaked from the chambers of the hydraulic valve clearance compensators and air has entered them | The noise will disappear after 15 minutes of engine operation, when the engine crankshaft reaches 2000–3000 rpm–1 Warning! Do not increase the engine speed above 3000 rpm-1, as the hydraulic valve clearance compensators may be damaged. |
Continuous noise after starting the engine and replacing the cylinder head | Not enough oil in engine oil passages | |
Continuous noise after a long start of the engine with a starter or towing method | Oil has leaked from the chambers of the hydraulic valve clearance compensators and air has entered them | |
Continuous noise after replacing hydraulic valve clearance compensators | ||
Continuous noise at idle after driving at high speed | Engine oil level too low or too high | Check engine oil level |
A large amount of air is dissolved in the oil after high speed | Check the oil supply system | |
Deterioration of engine oil properties | Check the quality of the oil and change it if necessary | |
Noise continues for more than 15 minutes | Low pressure in the lubrication system | Check the pressure in the lubrication system |
Faulty hydraulic valve clearance compensators | Remove the cylinder head and, by pressing on the hydraulic valve clearance compensators, check the amount of compression |
Chain
Check the chain for uneven wear, cracks or damage and replace if necessary.
Installation
1. Install hydraulic valve clearance compensators.
2. Install the chain on the camshaft sprockets as shown in the figure.
3. Before installing, apply a thin layer of clean engine oil to all sliding surfaces of the camshafts. Install the camshafts.
4. Install the camshaft bearing caps. Check the identification marks identifying the intake or exhaust camshafts.
- Intake camshaft: I
- Exhaust camshaft: E
5. Tighten the bearing cap bolts to the required torque.
Tightening torque: 12–14 Nm
6. Lubricate the sealing lips and outer surface of the sealing ring with engine oil and install the sealing ring on the front of the camshaft with the special tool 09221-21000.
By blows of a hammer on the special adaptation establish a sealing ring against the stop in a socket.
7. Install the camshaft pulley and secure it with the bolt.
Tightening torque: 80–100 Nm
8. Align the timing mark of the camshaft and the timing mark of the crankshaft pulley with the pointers, while the piston of the 1st cylinder will be at TDC on the compression stroke.
9. Establish a cover of a head of cylinders and tighten bolts of fastening of a cover the demanded moment.
Tightening torque: 8–10 Nm
10. Install high voltage wires, ignition coils and center cover.
11. Install the toothed belt and tighten the toothed belt tensioner.
12. Install the toothed belt guards.
13. Install the water pump pulley.