Camshaft Timing Chain, Removing And Installing, Engine Codes CHHB, CNTA, CXCA, CXDA, CXCB, CXDB And DKFA: Installing

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Fig 1: Check The Crankshaft @ TDC

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-- Check that the crankshaft is at TDC. The flat area on the crankshaft -arrow- must be horizontal.

-- Draw the markings on the cylinder block -1-, as shown, with a waterproof marker.

-- Draw a marking -2- on the three stage chain sprocket tooth -1- with a waterproof marker.

Fig 2: Draw Marking On Three Stage Chain Sprocket Tooth

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-- Turn the intermediate sprocket and balance shaft to the marks -arrow-, but do not loosen the bolt -1-.

Fig 3: Identifying Intermediate Shaft Sprocket

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NOTE:

The painted links of the chain must be positioned on the markings on the chain sprockets.

Fig 4: Identifying Chain Sprockets

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Ignore the position of any additional painted chain links that may also be present.

-- Lay the balance shaft drive chain, and position the painted links -arrows- on the chain sprocket markings.

-- Install the guide rail -1- and tighten the bolts -arrows-.

Fig 5: Identifying Guide Rail And Tighten Bolts

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

Fig 6: Camshaft Timing Chain And Camshaft Sprocket

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-- Lay the oil pump drive timing chain onto the three stage chain sprocket.

Fig 7: Identifying Three Stage Chain Sprocket

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-- Tilt the three stage chain sprocket in direction of -arrow- toward the engine and secure it to the crankshaft. The marks -arrows- must be positioned opposite each other.

-- Install the : T10531/2 in the crankshaft and tighten hand-tight.

Fig 8: Identifying Assembly Tool - Turning Over Tool T10531/3

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-- Install the : T10531/3 . Tighten the : T10531/4 hand-tight. Using a 32 mm open end wrench move the : T10531/3 back and forth slightly while doing this tighten the : T10531/4 until the chain sprocket is seated securely on the crankshaft splines. Now tighten the adjusting bolt -A-.

-- Position the painted chain link in the balance shaft drive chain -arrow- at the mark on the three stage chain sprocket. Install the tensioning rail -1- and the guide rail -2-. Tighten the bolts -3-.

Fig 9: Identifying Painted Chain Link In Balance Shaft Drive Chain

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-- Install the chain tensioner -1-.

Fig 10: Chain Tensioner And Balance Shaft Timing Chain

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-- Check the adjustment again. The painted chain links -arrows- must line up with the markings on the chain sprockets.

Fig 11: Identifying Painted Chain Links

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-- Place the camshaft timing chain on the intake camshaft, exhaust camshaft and the crankshaft. Position the painted chain links -arrows- on the markings on the chain sprockets.

Fig 12: Camshaft Timing Chain And Intake Camshaft

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-- Install the guide rail -2- and tighten the bolts -1-.

Fig 13: Removing Glide Rail

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-- Install the upper guide rail -1-.

Fig 14: Removing Guide Rail

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

-- Turn the exhaust camshaft slightly in the direction of -arrow A- using the : T40266 and push the : T40271/1 out of the chain sprocket splines in direction of -arrow B-. Release the camshaft in the direction of -arrow C-, until the timing chain touches the guide rail -1-. Hold the camshaft in this position, install the tensioning rail -2- and tighten the bolts -3-.

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-- Install the chain tensioner -1- and tighten the bolts -arrows-.

Fig 15: Bolts And Chain Tensioner

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-- Install the chain tensioner -2-. The wire clip -arrow- must come in to contact with the oil pan upper section opening. Tighten the bolt -1- and remove the : T40011 .

Fig 16: Identifying Chain Tensioner

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-- Turn the intake camshaft in the direction of the -arrow 1- using the : T40266 until the : T40271/2 -2- can be pushed out of the chain sprocket splines in direction of -arrow 2-. Release the camshaft.

Fig 17: Identifying Assembly Tool T40266 And Camshaft Clamp T40271/2

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-- Remove the : T40271/1 and : T40271/2 .

-- Check the adjustment. The painted chain links -arrows- must line up with the markings on the chain sprockets.

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

Fig 18: Identifying Bolts

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

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NOTE:

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

-- Attach the bearing mount. Do not tilt it when doing this. Hand-tighten the bolts -arrows-.

Fig 19: Identifying Bolts

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-- Remove the : T40267 .

Fig 20: Securing Chain Tensioner With T40267

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-- Tighten the bearing bracket bolts. Refer to -item ) Bolt.

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

-- Let the engine turn a second time in the direction of engine rotation.

NOTE:

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

-- Remove the turning over tool and install the lower timing chain cover. Refer to Installing .

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NOTE:

Tighten the bolts -1 and 4- with an additional turn after installing the vibration damper. The bolts must be removed again to install the vibration damper.

-- Install the vibration damper. Refer to VIBRATION DAMPER, REMOVING AND INSTALLING .

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

-- Install the ribbed belt tensioner. Refer to RIBBED BELT TENSIONER, REMOVING AND INSTALLING .

-- Install the ribbed belt. Refer to RIBBED BELT, REMOVING AND INSTALLING .

Further installation is performed in reverse order of removal, while noting the following:

-- After performing work on the chain drive the adaptation value in the engine control module must be adapted. To do so, turn on the ignition and select the following menu items on the Vehicle Diagnostic Tester:

01 - Engine Electronics
Guided Functions
01 - Adaptation after repair work on the chain drive