The chain tensioner is located inside the front part of the cylinder head and is attached to it
Remove the cylinder head cover (see Replacing the cylinder head cover gasket).
Remove the sprocket with the chain from the camshaft nose for this:
Use a chisel to bend back the edge of the lock washer of the camshaft sprocket mounting bolt (for clarity, the hoses of the outlet pipe of the cooling jacket are disconnected).
Using a 17 mm open-end wrench, unscrew the camshaft sprocket mounting bolt.
Remove the bolt together with the washers.
To loosen the chain tension, unscrew the nuts securing the hydraulic tensioner to the cylinder head (see. Removing the hydraulic tensioner of the camshaft drive chain and its pipeline on an injection engine).
In this case, do not disconnect the tensioner hydraulic drive tube.
To prevent the chain from jumping, tie it to the sprocket and remove the sprocket with the chain from the camshaft
Using a 10 mm open-end wrench, unscrew the two bolts (of the same length) securing the timing chain tensioner to the cylinder head
The bolt has a cylindrical shank for centering in the tensioner hole
Remove the tensioner
Install the tensioner in the reverse order
