Remove the cylinder head cover (see Replacing the cylinder head cover gasket).
We set the mark of the camshaft gear opposite the lug of the bearing housing.
Remove the alternator belt (see Replacing the alternator drive belt), coolant pump pulley (see Replacing the coolant pump).
Remove the camshaft drive chain tensioner (see Replacing the camshaft drive chain tensioner).
We unlock and unscrew the bolt securing the camshaft sprocket (see Replacing the camshaft and valve levers).
Remove the chain from the camshaft sprocket (see Replacing the cylinder head gasket).
Remove the crankshaft pulley (see Replacing the front crankshaft oil seal).
Using a 10 mm spanner, unscrew the three bolts securing the oil pan to the cover,...
...as well as six bolts and three nuts securing the camshaft drive cover to the block.
We remove the cover from the engine.
Using a 17 mm spanner, unscrew the tensioner shoe mounting bolt...
...and remove the tensioner shoe.
Bend back the edge of the lock washer of the bolt securing the oil pump drive sprocket...
...and using a 17 mm wrench, unscrew the bolt securing the oil pump drive sprocket.
We remove the bolt together with the washers.
We remove the star.
Using a 10 mm spanner, unscrew the chain limiting pin and remove it.
We remove the camshaft drive chain.
Remove the sprocket from the crankshaft nose (see Disassembling the crankshaft).
We install new parts of the camshaft drive mechanism in the reverse order. Then we press on the tensioner shoe with our finger, tightening the chain.
We check the simultaneous alignment of the marks on the crankshaft sprockets and the cylinder block (the chain has been removed for clarity), as well as marks on the camshaft sprocket and bearing housing (see Adjusting the clearance between the levers and the camshaft cams).
We charge the chain tensioner (see Replacing the camshaft drive chain tensioner), we install it in its original place and tighten the chain with it.
We adjust the ignition timing angle (see Adjusting the ignition timing angle).