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

WARNING: This page is about a different variant/trim than selected.

The crankshaft must not be at "TDC".
Replace the bolts that were tightened with an additional turn after removing them.

-- Make sure all the roller rocker levers lie correctly on the ends of the valve stems and are clipped onto the respective hydraulic lifters.

-- If the crankshaft was turned in the meantime: bring the piston for cylinder 1 to TDC and then turn the crankshaft back again slightly.

CAUTION:

Risk of Injuring the Eyes from Sealant Residue.

- Wear protective eyewear.

-- To prevent contamination of the lubricating system with sealant residue, place a clean cloth over the open engine components.

-- Remove any sealant residue on the cylinder head using the flat-blade scraper.

-- Remove any sealant residue from the groove on the cylinder head cover as well as on the sealing surfaces.

-- Clean the sealing surfaces. They must be free of oil and grease.

The adjusting element pins must not be in the outward position.

Fig 1: Bring the Cam Adjustment Actuators into the Installed Position
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-- Press down the cam adjustment actuator pins in direction of -arrow- by hand.

-- Lubricate the running surfaces of both camshafts.

-- If the camshafts are replaced, the markings -arrow- need to be transferred onto the new camshafts.

Fig 2: Mark Camshaft Sprocket

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-- Place the intake camshaft -A- in the cylinder head. Turn the cam lobes of cylinder 4 -arrows- upward.

Fig 3: Identifying Intake Camshaft And Cylinder Head

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Fig 4: Placing Exhaust Camshaft In Cylinder Head Cover

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CAUTION:

Risk of Injuring the Eyes Due to the Sliding Bar Ball Springing Out.

- Wear protective eyewear.

-- Place the exhaust camshaft in the cylinder head cover as shown. The cam pair -A and B- must be pushed together.

-- Turn the exhaust camshaft until the markings -A and B- align.

Fig 5: Locating Alignment Marks

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-- Apply the sealant on the clean sealing surface of the cylinder head cover as shown -arrows-.

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CAUTION:

Risk of engine damage due to excess sealant in the lubrication system.

- Do not apply sealant bead thicker than indicated.

Sealant bead thickness: 1.5 to 2.5 mm

-- Secure the camshaft and place the cylinder head cover with the camshaft on the cylinder head.

-- Lightly push on the cylinder head cover by hand and while doing so turn the camshaft slightly until the cylinder head cover lays >>free of tension<< on the cylinder head.

Fig 6: Turning Camshafts

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-- Replace the cylinder head cover bolts.

-- Tighten the bolts in several steps. Refer to Figure for the tightening sequence.

NOTE:

Make sure the cylinder head cover is not tilted.

-- Turn the intake camshaft in direction of -arrow 1- until the marking -3- aligns with the : T40271/2 .

Fig 7: Identifying Markings And Camshaft Clamp T40271/2

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-- Slide the : T40271/2 into the chain sprocket splines in direction of -arrow 2-.

-- Turn the exhaust camshaft in direction of -arrow 1- until the marking -3- aligns with the : T40271/1 .

Fig 8: Identifying Markings And Camshaft Locating Tool T40271/1

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-- Slide the : T40271/1 into the chain sprocket splines in direction of -arrow 2-.

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

Fig 9: Cylinder Head Exploded View

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The notch on the vibration damper and the marking on the lower cover for timing chain must be opposite one another -arrow-.

-- Position the markings on the chain links -arrows- at the chain sprockets -1- to mount the camshaft timing chain.

Fig 10: Identifying Markings On Chain Links

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-- Install the upper guide rail -2-.

-- 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 release the camshaft.

Fig 11: Identifying Assembly Tool T40266

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-- Guide the tensioning rail -2- upward and install the bolt -1-.

Fig 12: Identifying Tensioning Rail Bolt

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-- 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 release the camshaft.

Fig 13: Identifying Assembly Tool T40266 And Camshaft Clamp T40271/2

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Checking Valve Timing - with Marks on the Cylinder Head Cover

Fig 14: Identifying Vibration Damper With Counterhold - Vibration Damper T10355

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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.

Checking Valve Timing - without Marks on the Cylinder Head Cover

Fig 15: Identifying Markings On Chain Sprocket

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-- The camshaft timing chain and cylinder head -arrows- must align with the markings on the chain sprocket -1-.

-- The markings for the camshaft timing chain and the camshaft timing chain guide rail -2- must align.

-- The notch on the vibration damper must align with the marking on the lower timing chain cover -3-.

NOTE:

If the self-made markings are no longer visible, check the valve timing. Refer to VALVE TIMING, CHECKING .

Continued for All Engines:

Fig 16: Identifying Bolts

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-- Install the bolts -arrows- and tighten them. Tightening specification -item ) Bolt.

-- Lubricate the holes -arrows- with engine oil.

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NOTE:

The adapter sleeve -1- is not present on every bearing bracket.

Carefully connect the bearing bracket without tilting - risk of damage.

Fig 17: Identifying Bolts
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-- Mount the bearing bracket and the bolts -arrows- hand-tight.

-- Remove the : T40267 .

Fig 18: Securing Chain Tensioner With T40267

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-- Tighten the bearing bracket bolts. Refer to Figure.

-- Install the control valves -item ) Control Valves.

-- Install the vacuum pump. Refer to VACUUM PUMP, REMOVING AND INSTALLING .

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

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

There are additional procedures depending on the model. Refer to CAMSHAFT, REMOVING AND INSTALLING .

After Removing or Replacing the Camshafts the Adaptation Values for the Chain Length must be Adapted Again.

-- Connect the Vehicle Diagnostic Tester.

-- Select Diagnostic operating mode and Start diagnostics .

-- Select the Select individual test tab and select the following tree structure consecutively:

Drivetrain
Select the engine code and engine
01 - OBD-capable systems .
01 - Engine Electronics
01 - Engine electronics, functions
01 - Chain length diagnostic adaptation