Camshaft Timing Chain, Removing And Installing: Installing

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

Requirements:

Vehicle without High-Voltage System with Starter Generator:

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The crankshaft is at "TDC" ; the V-shaped cut-out on the three-layer chain sprocket points in an imaginary vertical line -arrows- centered between the camshaft chain sprockets.
Three-layer chain sprocket locked with the Assembly Tool - Tensioning Bolt: T10531/6 .

Vehicle with Generator or High-Voltage System:

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The crankshaft is at "TDC" ; the V-shaped cut-out on the three-layer chain sprocket points in an imaginary vertical line -arrows- centered between the camshaft chain sprockets.
Three-layer chain sprocket locked with the Vibration Damper Assembly Tool - Tensioning Bolt: T10531/2 .

Continuation for All Vehicles:

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Camshaft chain sprockets locked at "TDC" using the Camshaft Locks: T40271/1 and Camshaft Locks : T40271/2 .
The marking -arrow B- at the exhaust camshaft must be shifted by half a tooth clockwise to the marking -arrow A- at the cylinder head cover.
The marks -arrows C- must be positioned opposite to each other.

-- Engage the camshaft timing chain with the painted links -arrows- on the camshaft pins as shown.

Fig 1: Camshaft Timing Chain And Camshaft Sprocket

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-- Camshaft timing chain on intake camshaft; mount the exhaust camshaft and the three-layer chain sprocket.

Fig 2: Camshaft Timing Chain And Intake Camshaft

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The painted chain links must align with the markings on the chain sprockets -arrows-.

-- Insert the guide rail -2- and tighten the guide pin -1-.

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-- Engage the upper guide rail -1- into the retainer -arrow-.

Fig 3: Removing Guide Rail

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The help of a second technician is necessary for the following step.

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-- Lower the pretension of the exhaust camshaft using the Assembly Tool: T40427 in direction of -arrow B- and remove the Camshaft Positioning Tool: T40271/1 from the splines of the chain sprocket in direction of -arrow C-.

-- Remove the exhaust camshaft in the direction of -arrow A- until the timing chain touches the guide rail -3-.

-- Hold the camshaft in this position, insert the tensioning rail -2- and tighten the guide pin -1-.

-- Remove the Camshaft Locks: T40271/1 .

-- Reduce the intake camshaft pretension using the Assembly Tool: T40427 in the direction of -arrow A-, pull the Camshaft Lock: T40271/2 out of the chain sprocket splines in direction of -arrow B-, and bring the camshaft into its resting position.

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-- Remove the Camshaft Locks: T40271/2 .

-- Install the bolts -arrows- and tighten them. Tightening specification. Refer to -item : Bolt.

Fig 4: Identifying Bolts

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-- Coat the holes of the radial bearings -arrows- and axial bearings with engine oil.

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-- Install the spacer.

-- Check if the adapter sleeve -1- is installed.

-- If the bearing bracket should be reused, then the adapter sleeve must be driven back.

The adapter sleeve must be flush in the housing of the bearing bracket.

Carefully attach the bearing mount, without tilting.

Fig 5: Bearing Bracket (With Aluminum Bolts) Tightening Sequence
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-- Attach the bearing mount and install the bolts -1 to 6- all the way by hand.

-- Remove the Locking Tool: T40435 .

-- Tighten the bearing bracket bolts (refer to Figure), at the same time the adapter sleeve is pulled into the cylinder head with the bolt -1-.

-- Checking adjustment:

Fig 6: Identifying Painted Chain Links Must Line Up With Markings On Chain Sprockets

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The painted chain links must align with the markings on the chain sprockets -arrows-.

-- Install the control valves -item : Control Valve.

-- Apply the oil pump drive chain.

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-- Insert the chain tensioner and tighten the guide pin -3-.

-- Engage the tension spring wire clip -4- into the cut-out -arrow- of the oil pan upper section.

Fig 7: Identifying Assembly Tool - Turning Over Tool T10531/3

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CAUTION:

Risk of damaging the engine by the timing mechanism skipping.

- Only let the engine turn in the direction of engine rotation.

-- Install the Assembly Tool - Knurled Nut: T10531/4 and the Assembly Tool - Turning Over Tool: T10531/3 .

CAUTION:

Risk of damaging the valves and piston crowns by performing procedures on the valvetrain.

- To ensure valves do not strike pistons when starting, carefully rotate the crankshaft at least two turns.

-- Turn the engine twice in the direction of engine rotation.

TIP:

Due to the ratio, the painted chain links no longer match up after the engine has been turned.

-- Remove the knurled nut and the turning over tool.

Install in reverse order of removal. Note the following:

-- Replace the lower timing chain cover. Refer to LOWER TIMING CHAIN COVER, REPLACING .

-- Replace the upper timing chain cover. Refer to UPPER TIMING CHAIN COVER, REMOVING AND INSTALLING .