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Removing Cylinder head installed Remove noise insulation panel -arrows-. Remove front bumper => Repair Manual, Body Exterior, Repair Group 63 Move lock carrier to service position => Repair Manual, Body Exterior, Repair Group 50 Remove ribbed belt => Page 13-1. Remove toothed belt => Page 13-4. Left cylinder head Remove left-hand cylinder head cover => Page 15-22. Right cylinder head Remove right-hand cylinder head cover => Page 15-25 All: Unbolt Hall sensor housing (10 Nm). Remove bolt securing Hall sensor rotor (20 Nm) and carefully lever off rotor using a screwdriver. Insert camshaft clamp 3391 in securing plates of two camshafts. Loosen both camshaft bolts and remove approx. 5 turns. Take out camshaft clamp 3391. Pull off both camshaft sprockets with special tool T40001. Using a screwdriver, carefully pry oil feed lines for camshaft bearings out of camshaft bearings. Make sure that the retaining catches do not break off when prying out the oil lines. Secure camshaft adjuster using retainer for chain tensioner 3366. Note: Do not over tighten retainer for chain tensioner, otherwise camshaft adjuster can be damaged. Check TDC position of camshafts once again. Note: The two markings on the camshafts must be in line with the two arrows on the bearing caps. Clean drive chain and camshaft chain sprockets in vicinity of arrows on bearing caps and mark position of chain on sprockets with paint opposite two arrows. Note: The distance between the two arrows (and thus between the paint markings) is 16 rollers on the chain. The notch on the exhaust camshaft is offset slightly towards the inside in relation to chain roller -1-. Do not mark the chain with a center punch or by making a notch or similar.