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 TIMING CHAIN, CHECKING .

-- 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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-- 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 TIMING CHAIN, CHECKING .