Camshaft Timing Chain, Removing And Installing: Installing

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Requirements:

• 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  .

• Camshaft chain sprockets locked at "TDC" using the Camshaft Lock:T40271/3  and Camshaft Lock:T40271/4  .

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• 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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-- Insert the guide track -1- and tighten the bolts -arrows-.

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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 Lock:T40271/4  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 Lock:T40271/4  .

-- Reduce the intake camshaft pretension using the Assembly Tool:T40427  in the direction of -arrow A-, pull the Camshaft Lock:T40271/3  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 Lock:T40271/3  .

-- Install the bolts -arrows- and tighten them. Tightening specification. Refer to -item 4-  OVERVIEW - CYLINDER HEAD.

Fig 3: Identifying Bolts

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

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-- 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 4: Bearing Bracket Tightening Sequence

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-- Attach the bearing mount and install the bolts -1 to 6- all the way by hand.

-- Remove the special tool 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 -2-.

-- Checking adjustment:

Fig 5: 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 6-  OVERVIEW - CAMSHAFT TIMING CHAINS.

-- Apply the oil pump drive chain.

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-- Insert the chain tensioner and tighten the guide pin -2-.

-- Engage the tension spring wire clip -3- to the cut-out at the oil pan upper section -arrow-.

Fig 6: Identifying Assembly Tool - Turning Over Tool T10531/3

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

-- 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 .