Camshaft, Removing And Installing, Engine With Guide Rail Version 2: Removing

• The cylinder head cover sealing surfaces on the cylinder head must not be worked on.
• The camshaft bearings are integrated in the cylinder head or cylinder head cover. Before removing the cylinder head cover the tension from the camshaft timing chain must be released.
• During installation, all cable ties must be installed at the same location.

Preliminary work may be required depending on the model. Refer to OVERVIEW - VALVETRAIN, ENGINE WITH TWO CAMSHAFT ADJUSTERS  or OVERVIEW - VALVETRAIN, ENGINE WITH ONE CAMSHAFT ADJUSTER .

-- Remove the upper timing chain cover. Refer to TIMING CHAIN COVER, REMOVING AND INSTALLING, ENGINE WITH TWO CAMSHAFT ADJUSTERS .

-- Remove the high pressure pump. Refer to HIGH PRESSURE PUMP, REMOVING AND INSTALLING .

-- Remove the vacuum pump. Refer to VACUUM SYSTEM .

• Pay attention to the direction of rotation: the control valves have left-hand threads - risk of damaging the threads.

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-- Remove the left and right control valve in direction of -arrow-.

Depending on the version of the control valve use one of the tools listed:

• : T10352B 
• : T10352/1A 
• : T10352/2 
• : T10352/3 
• : T10352/4 

-- To do so counterhold the crankshaft on the vibration damper with the : T40263  , : T40314  and the 24 mm socket.

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-- Remove the bolts -arrows-.

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• Carefully remove the bearing bracket without tilting - risk of damage.

-- Remove the bearing mount.

TIP: 

The combination of the : T40263  , : T40314  and 24 mm socket are better suited than the : T10355  for positioning the vibration damper.

With Marks in the Cylinder Head Cover 

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-- Turn the vibration damper in the "TDC" position.

• The notch on the vibration damper must align with the arrow marking on the lower timing chain cover -arrow-.
• The markings -1- on the camshaft chain sprockets must be opposite the markings -2 and 3- on the cylinder head.

Without Marks in the Cylinder Head Cover 

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-- Turn the vibration damper in the "TDC" position.

• The notch on the vibration damper and the marking on the lower cover for timing chain must be opposite one another -arrow-.
• The markings -1- on the camshafts must point upward.

-- Mark the camshaft timing chain and the cylinder head -arrows- to match the marking on the chain sprockets -1- with a waterproof marker.

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-- In addition, mark the camshaft timing chain to the camshaft timing chain guide rail -2- with a waterproof marker.

Continuation for All Engines: 

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-- Remove the plug -arrow-.

-- Remove the bolts -arrows-.

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-- Remove the bolt -arrow-.

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-- Install the : T40243  in direction of -arrows-.

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• A second technician is required for the following steps.

-- Press the chain tensioner circlip -1- together and hold it.

-- Slowly press and hold the : T40243  in direction of -arrow-.

-- Secure the chain tensioner with the : T40267  .

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-- Remove the : T40243  .

-- Bolt the : T40271/2  to the cylinder head and push the chain sprocket splines in direction of -arrow 2-. If necessary, turn the intake camshaft with an : T40266  in direction of -arrow 1-.

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-- Remove the bolt -1- and guide the tensioning rail -2- downward.

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-- Install the : T40271/1  on the cylinder head.

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-- Turn the exhaust camshaft with the : T40266  in direction of -arrow 1- and slide the : T40271/1  in the chain sprocket splines in direction of -arrow 2-.

-- Mark the camshaft sprocket to the : T40271/1  and the : T40271/2  -arrow-.

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-- Remove the upper guide rail -1- by unlocking the catch with a screwdriver and pushing the guide rail forward.

-- Remove the camshaft timing chain from chain sprockets.

-- Turn the vibration damper in the opposite direction of the engine rotation out of "TDC".

-- Use the : T40266  to turn the intake camshaft in direction of -arrow 1-, slide out the : T40271/2  from the chain sprocket splines in direction of -arrow 2- and bring the camshaft into the rest position.

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-- Use the : T40266  to turn the exhaust camshaft in direction of -arrow 1-, slide out the : T40271/1  from the chain sprocket splines in direction of -arrow 2- and bring the camshaft into the rest position.

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-- Remove the cylinder head cover bolts in -1 to 6- sequence.

-- Pry up the cylinder head cover -2- using a tool for example a screwdriver -1- starting at the chain side.

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-- Guide the cylinder head cover under the permanent ventilation.

-- Remove the camshaft and cover the open engine components.

-- If necessary for continuing work: mark the roller rocker lever and hydraulic lifter for reinstallation, remove them and place on a clean surface.