Move camshafts, chain and tensioning element of cylinder bank 1 -3 to basic position or installation position.

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Place the inlet camshaft and exhaust camshaft on a soft surface. The lug of the camshaft position sensor cover or the groove on the inlet camshaft and the dotting marks must face upward.

Fig 1: Identifying Inlet Camshaft Groove, Camshaft Position Sensor Cover Lug & Dotting Marks
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Place chain on the drive sprockets of the camshafts. The colored outer lugs of the chain must face the dotting marks.

Fig 2: Aligning Colored Outer Lugs Of Chain With Dotting Marks On Drive Sprockets Of Camshafts
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Fit tensioning element.
3.1 Press slide rails together and push upward.

Fig 3: Pressing Tensioning Element Slide Rails Together And Pushing Upward
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3.2 Lift inlet camshaft and insert tensioning element from the front.

Fig 4: Lifting Inlet Camshaft And Insert Tensioning Element From Front
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3.3 Fit chain; when doing so, observe clearance between the gear wheels and the lower slide rail.

Fig 5: Installing Chain On Tensioning Element
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Fig 6: Checking Clearance Between Gear Wheels And Lower Slide Rail
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Completely preassembled and ready for installation. Do not remove the tensioning screw, special tool 9632, until the bearing saddles and the chain tensioner have been fastened on the cylinder head. If allocation is correct, the groove or lug of the camshaft position sensor housing face upward.

Fig 7: Ensuring Groove Or Lug Of The Camshaft Position Sensor Housing Faces Upward
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