Contents: Removal ⇓ Installation ⇓
Note: If the valve train parts are to be reused, they must be installed in their original positions. It is therefore recommended to prepare a suitable storage box for the parts.
Removal
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.
Unscrew the bolt and remove the camshaft sprocket.
Remove the valve cover.
Remove the bolt on the camshaft sprocket flange and pull the flange off the camshaft using a suitable two-jaw puller. Remove the spring washer.
First remove the covers of bearings 5, 1 and 3. The cover of the first bearing is on the toothed belt side, and the cover of the fifth bearing is closer to the gearbox. Then crosswise unscrew the bolts of the covers of the second and fourth bearings.
Note: The first bearing shell on the toothed belt side has an additional inner shell.
Remove the camshaft.
Note: If the plate tappets are removed, they must be marked so that they can be put back in the same positions.
Installation
If the same camshaft is to be installed on engines with high mileage or with noise in the valve drive mechanism, it is recommended to check the axial clearance beforehand. The wear limit is 0.24 mm. The measurement is made with the tappets removed and the fifth and first bearing caps installed.
Lubricate the first bearing cap on the sealing surface with the cylinder head (marked in the picture) a thin layer of suitable sealant.
Place the bearing caps in their original positions. The arrows on the bearing caps should point towards the toothed belt.
If the plate tappets were removed, put them back in their original places. Lightly lubricate the tappets and do not tilt them when installing.
Lubricate the camshaft and insert it.
Note: The cams of the first cylinder must be directed upwards. Install the bearing caps in accordance with the numbering.
Tighten the bolts of the second and fourth bearing caps in turn, crosswise, to a torque of 20 Nm.
Install the covers of the fifth, first and third bearings and tighten their mounting bolts to a torque of 20 Nm. In this case, drive the cover of the fifth bearing onto the end surface of the camshaft with light blows.
Lightly lubricate the camshaft seal with clean engine oil and insert it using a special tool. If you don't have one, you can insert the seal using a pipe whose inner and outer diameters are equal to the inner and outer diameters of the seal.
Insert the spring washer for the camshaft sprocket flange into the groove of the camshaft. Install the flange and tighten the central bolt to 30 Nm.
Install the camshaft sprocket and tighten the bolts by hand.
Place the timing belt on the camshaft sprocket and tighten the belt.
Check the valve clearance.