•  Timing marks are stamped onto the camshaft sprockets in order to assist with the adjustment of the valve timing. During installation these marks must be brought into alignment with the marks on the timing chain links.

•  The installation position of the intake camshaft timing pulley is defined by a Woodruff key.

•  The timing chain tensioner should be inserted into the upper part of the cylinder head between the two runs of the timing chain before the camshafts are installed. It is not possible to install it at a later stage.

•  The timing chain tensioner comprises two halves which are pushed into each other during installation.

•  A spring is located between the two halves to provide the necessary tension for the timing chain.

•  For lubrication the timing chain tensioner is connected via an oil supply duct to the oil circuit of the engine.