Attention: If the parts of the valve drive mechanism are to be reused, they must be installed in their original positions. Therefore, it is recommended to prepare an appropriate storage box for the parts.
Removing
Set the crankshaft to the TDC position of the first cylinder. Loosen the toothed belt tension and remove it only from the top of the camshaft sprocket.
Loosen the bolt and remove the camshaft sprocket.
Remove valve cover.
Unscrew the bolt on the camshaft sprocket flange and pull the flange off the camshaft using a suitable two-arm puller. Take out the spring washer.
First remove bearing caps 5, 1 and 3. The first bearing cap is on the timing belt side, and the fifth bearing cap is closer to the gearbox. Then unscrew the bolts of the covers of the second and fourth bearings crosswise.
Note: The first bearing bush on the toothed belt side has an additional inner bush.
Take out the distributor.
Attention: If the poppets are to be taken out, they must be marked so that they can then be put in the same positions.
Installation
If the old camshaft is installed in engines with high mileage or with noise in the valve drive mechanism, it is recommended to check the axial play before this. The wear limit is 0.24 mm. The measurement is made with the pushers removed and the covers of the fifth and first bearings installed.
Lubricate the first bearing cap on the sealing surface with the cylinder head (marked in the figure) a thin layer of a suitable sealant.
Reinstall the bearing caps in their original positions. The arrows on the bearing caps must point towards the toothed belt.
If the poppets have been removed, put them back in their original positions. Lightly grease the tappets and do not distort them during installation.
Lubricate the camshaft and install it.
Attention: When doing this, the cams of the first cylinder must be directed upwards. Install the bearing caps according to the numbering.
Tighten the bolts of the second and fourth bearing caps crosswise to 20 Nm.
Install the covers of the fifth, first and third bearings and tighten their fastening bolts to a torque of 20 Nm. At the same time, drive the cover of the fifth bearing onto the end surface of the camshaft with light blows.
Lightly lubricate the camshaft oil seal with clean engine oil and insert it using the special tool. If it is not available, then the gland can be inserted using a pipe whose inner and outer diameters are equal to the inner and outer diameters of the gland.
Insert the spring washer for the camshaft sprocket flange into the camshaft groove. Install the flange and tighten the central bolt to 30 Nm.
Put on the camshaft sprocket and tighten the bolts by hand.
Put the toothed belt on the camshaft sprocket and tighten the belt.
Check valve clearance.