Identification For Cylinder Bank 4 - 6

Fig 1: Identifying Camshaft Tensioning Element - Cylinder Bank 4-6 (Solenoid Valve Surface Color Gray)

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1. Cylinder bank 4
2. Solenoid valve surface color grey

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

1. 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 2: Locating Lug Of Camshaft Position Sensor Cover Or Groove

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2. Place chain on the drive sprockets of the camshafts. The colored outer lugs of the chain must face the dotting marks.
   Fig 3: Aligning Colored Outer Lugs Of The Chain With Camshaft Drive Sprocket Dotting Marks

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3. Fit tensioning element.
   1. Press slide rails together and push upward.
      Fig 4: Pressing Slide Rails Together And Pushing Upward

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   2. Lift inlet camshaft and insert tensioning element from the front.
      Fig 5: Inserting Camshaft Tensioning Element

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   3. Fit chain; when doing so, observe clearance between the gear wheels and the lower slide rail.
   Fig 6: Fitting Camshaft Chain

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   Fig 7: Observing Clearance Between The Gear Wheels And The Lower Slide Rail

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4. 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 8: Locating Groove Or Lug Of Camshaft Position Sensor

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Move camshafts, chain and tensioning element of cylinder bank 4 -152,40 mm basic position or installation position. 

1. The lug of the camshaft position sensor cover or the groove on the inlet camshaft must face downward. The dotting marks must face upward.
   Fig 9: Locating Camshaft Sprocket Dotting Marks & Groove And Lug Of Camshaft

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   Fig 10: Aligning Camshaft Dotting Marks

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   NOTE:

   • The rotor cover for the camshaft position sensor is no longer installed in vehicles without M660 (OBDII) or M661 (more demanding emission concept).
2. Put on and fit chain as described for cylinder bank 1 - 3.
   Fig 11: Aligning Timing Marks With Camshaft Sprocket Marks

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3. Completely assembled 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 faces downward.
   Fig 12: Locating Groove Or Lug Of Camshaft Position Sensor

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   NOTE:

   • Modified tensioning element (VarioCam) as of June 1999. The tensioning screw has been changed to a LEFT-HAND THREAD. Can be identified by the index (57) in the area of the guide rails
   • Introduction as of engine number 65X19696
   Fig 13: Identifying Tensioning Screw (VarioCam)

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