Timing Chain, Checking

If an elongated camshaft timing chain is suspected based on complaints (for example noises), the timing chain can be checked as described in the following.

Special tools and workshop equipment required

Wrench - 21mm: T40263

Fig 1: Identifying Wrench - 21mm
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Adapter: T40314

Fig 2: Adapter T40314
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Procedure

Preliminary work may be required depending on the model. Refer to CHAIN DRIVE .

-- Remove the plug -arrow-. The plugs must be replaced.

Fig 3: Identifying Plug

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Fig 4: Using T40263 & T40314

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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.

-- Turn the crankshaft with Wrench - 21mm: T40263 , Adapter: T40314 and a 24 mm socket only in the direction of engine rotation -arrow-.

-- Turn the crankshaft in direction of engine rotation until the chain tensioner piston is extended the maximum distance in the direction of -arrow-.

Fig 5: Identifying Vibration Damper

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-- Count the visible piston teeth.

TIP:

The visible teeth are all of the teeth that are located to the right of the chain tensioner housing -arrow-.

If six or fewer teeth are visible, the timing chain must not be replaced.
If six or fewer teeth are visible and there is an entry in the DTC memory: adjust the chain length using the Vehicle Diagnostic Tester, 01 - Chain Length Adaptation Diagnosis and delete the DTC memory.
If seven or more teeth are visible: replace the camshaft timing chain. Refer to CAMSHAFT TIMING CHAIN, REMOVING AND INSTALLING .

There are additional procedures depending on the model. Refer to CHAIN DRIVE .