To start removing the timing system, a complex procedure should be carried out. That is, begin by taking away spark plugs and valve cover. Subsequently, remove crankshaft pulley, crankshaft front oil seal, drivebelt and oil pan. Make sure that the engine is at TDC No 1 cylinder and press back the chain tensioner using a special tool to lock it for oil pump drive chain. Locking tools are used for automatic or manual tranny models to keep
Flywheel from rotating and preventing crankshaft turning. Take out the centre bolt of the crankshaft and after this remove intake plus exhaust camshafts VANOS adjusting units. Turbocharger wastegate vacuum unit bolts and timing chain tensioner must be removed. Remove Allen-head plugs on the crankshaft pulley hub in order to free it up for extraction along with timing chain module guides Torx screws have to be taken put of place as well. Unscrew M7 (or M8 on some engines) bolts holding timing chain module to cylinder head and lift off module with chain and sprocket together. Note its orientation, detach if required from sprocket at this stage itself by positioning piston No 1 at TDC whilst counterbalance shaft gets locked up again through use of a special tool during installation stage Collar must face towards side of crankshaft where sprocket will be located when meshed with collar Lower into position so that timing chain with module can then be hung down over this end onto which new hub-retaining bolt has already been inserted Then torque down center bolt of hub while carefully locking flywheel against rotation or prevention Rotate engine two full revolutions clockwise: check that flywheel can still occupy positions Meanwhile just reverse procedure replacing gaskets seals aluminum bolts tighten all fasteners according to specified torque values fit drive belt.