Removing
1. Remove spark plugs, see chapter Maintenance.
2. Remove the cylinder head cover with gasket.
3. Set the crankshaft to the position corresponding to the TDC of the piston of the 1st cylinder, see Section Removal and installation of a gear belt (DOHC).
Attention! The position of the crankshaft should no longer change after this.
4. Remove toothed belt, see Section Removal and installation of a gear belt of VZ, V5, B6 engines (SOHC), VR (SOHC).
5. Remove the ignition distributor, see Chapter Ignition system, Chapter Removal and installation of the distributor of ignition.
6. Holding the camshafts with a wrench, unscrew the bolts securing the gears. Remove the camshaft gears, if necessary knock them down with light blows of a rubber mallet.
Attention! Remove the gear wheels carefully so as not to lose the guide pins.
7. Unscrew the sealing plate.
8. Check the end play of the camshafts. Required value: 0.07 - 0.19 mm. Maximum allowable axial play: 0.20 mm. If this value is exceeded, the camshafts and possibly the cylinder head must be replaced.
9. Mark all bearing caps with chalk or felt-tip pen so that they can be reinstalled in the same place and in the same position during installation.
10. Loosen the intake and exhaust camshaft bearing caps evenly in several passes in the order shown and remove the caps.
11. Remove camshafts with old seals.
Installation
Attention! Since the end play of the camshaft is extremely small, the camshaft must be kept in a horizontal position during installation. To ensure this, the following requirements must be met. If the camshaft is skewed during installation, the shaft itself or the cylinder head may be damaged.
1. Coat all camshaft bearings with a little engine oil.
2. Insert camshafts.
3. Apply silicone-based sealant to the shaded areas (For example, DOW CORNING Q3-7057).
Attention! Sealant must not be applied to the bearing journals.
4. Install all bearing caps as marked.
5. Tighten the bearing cap bolts using a torque wrench in the sequence shown. Bolts are tightened in two passes.
- 1st pass: 10 Nm
- 2nd pass: 15 Nm
6. Lubricate the camshaft seals and their seat with a small amount of engine oil. Carefully hammer the stuffing box with a pipe of the same diameter. Drive in the seals so that they are flush with the cylinder head.
Attention! Do not twist seals during installation.
7. Install the sealing plate and tighten the fastening bolts with force 10 Nm.
8. Clean the camshaft gear from water and oil.
8. Rotate the camshafts so that the guide pins are facing up.
9. Install the camshaft gears upwards with marks I (intake side), E (graduation party).
10. Tighten the camshaft mounting bolts with force 60 Nm. While doing this, hold the wheel with a wrench.
Attention! When tightening the camshaft, do not damage the cylinder head with a wrench.
11. Install and tighten the toothed belt, see Section Removal and installation of a gear belt of VZ, V5, B6 engines (SOHC), VR (SOHC).
12. Apply silicone-based sealant to the shaded areas (For example, DOW CORNING Q3-7057).
13. Install the cylinder head cover with gasket and tighten firmly 10 Nm.
14. Install the ignition distributor, see Chapter Ignition system, Chapter Removal and installation of the distributor of ignition.