Mercedes-Benz Cars 2000-05

Timing Chain

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Removal & Installation




NOTE
An endless timing chain is used on production engines, but a split chain with a connecting link is used for service. The endless chain can be separated with a -chain breaker-. Only 1 master link (connecting link) should be used on a chain.

  1. Before servicing the vehicle, refer to the precautions in the beginning of this section.
  2.  
  3. Remove or disconnect the following:

    Negative battery cable
     
    Spark plugs
     
    Valve cover(s)
     
    Engine timing covers
     

  4.  
  5. Clamp the chain to the camshaft gear and cover the opening of the timing chain case.
  6.  
  7. Separate the chain with a chain breaker.
  8.  

To install:

Click image to see an enlarged view

Fig. Replacing the timing chain-104 engine shown

  1. Attach a new timing chain (5) to the old chain (4) with a master link (6), center plate (7) and end plate (8). Using a socket wrench on the crankshaft, slowly rotate the engine in the direction of normal rotation. Simultaneously, pull the old chain through until the master link is uppermost on the camshaft sprocket (9). Be sure to keep tension on the chain throughout this procedure.
  2.  
  3. Disconnect the old timing chain and connect the ends of the new chain with the master link. Insert the new connecting link from the rear so the lockwashers can be seen from the front.
  4.  
  5. Rotate the engine until the timing marks align. Check the valve timing.
  6.  
  7. Install or connect the following:

    Engine timing covers
     
    Valve covers
     
    Spark plugs
     
    Negative battery cable
     

  8.  
  9. Start the engine and check operation.
  10.  

  1. Before servicing the vehicle, refer to the precautions in the beginning of this section.
  2.  
  3. Remove or disconnect the following:

    Negative battery cable
     
    Cylinder head cover
     
    Injection nozzles
     
    Chain tensioner
     
    Fan and shroud
     
    Engine timing cover
     

  4.  
  5. Clamp the chain to the camshaft gear and cover the opening of the timing chain case.
  6.  
  7. Separate the chain with a chain breaker.
  8.  

To install:

  1. Attach a new timing chain to the old chain with a master link. Using a socket wrench on the crankshaft, slowly rotate the engine in the direction of normal rotation. Simultaneously, pull the old chain through until the master link is uppermost on the camshaft sprocket. Be sure to keep tension on the chain throughout this procedure.
    NOTE
    Use only a rivet-type connecting link. Do not use connecting link that uses a retaining spring.

  2.  
  3. Disconnect the old timing chain and connect the ends of the new chain with the master link. Insert the new connecting link from the rear so the lockwashers can be seen from the front.
  4.  
  5. Install the timing chain tensioner. Rotate the engine until the timing marks align. Check the valve timing.
  6.  
  7. Install or connect the following:

    Engine timing cover. Torque the bolts to 18 ft. lbs. (25 Nm)
     
    Cylinder head cover. Torque to 90 inch lbs. (10 Nm)
     
    Fan and fan shroud
     
    Injection nozzles
     
    Negative battery cable
     

  8.  

Diesel Engines
  1. Before servicing the vehicle, refer to the Precautions section.
  2.  
  3. Remove or disconnect the following:

    Negative battery cable
     
    Cylinder head cover
     
    Injection nozzles
     
    Chain tensioner
     
    Fan and shroud
     
    Engine timing cover
     

  4.  
  5. Clamp the chain to the camshaft gear and cover the opening of the timing chain case.
  6.  
  7. Separate the chain with a chain breaker.
  8.  

To install:

  1. Attach a new timing chain to the old chain with a master link. Using a socket wrench on the crankshaft, slowly rotate the engine in the direction of normal rotation. Simultaneously, pull the old chain through until the master link is uppermost on the camshaft sprocket. Be sure to keep tension on the chain throughout this procedure.
    NOTE
    Use only a rivet-type connecting link. Do not use connecting link that uses a retaining spring.

  2.  
  3. Disconnect the old timing chain and connect the ends of the new chain with the master link. Insert the new connecting link from the rear so the lockwashers can be seen from the front.
  4.  
  5. Install the timing chain tensioner. Rotate the engine until the timing marks align. Check the valve timing.
  6.  
  7. Install or connect the following:

    Engine timing cover. Torque the bolts to 18 ft. lbs. (25 Nm)
     
    Cylinder head cover. Torque to 90 inch lbs. (10 Nm)
     
    Fan and fan shroud
     
    Injection nozzles
     
    Negative battery cable
     

  8.  

Gasoline Engines

NOTE
An endless timing chain is used on production engines, but a split chain with a connecting link is used for service. The endless chain can be separated with a -chain breaker-. Only 1 master link (connecting link) should be used on a chain.

  1. Before servicing the vehicle, refer to the Precautions section.
  2.  
  3. Remove or disconnect the following:

    Negative battery cable
     
    Spark plugs
     
    Valve cover(s)
     
    Engine timing covers
     

  4.  
  5. Clamp the chain to the camshaft gear and cover the opening of the timing chain case.
  6.  
  7. Separate the chain with a chain breaker.
  8.  

To install:

Click image to see an enlarged view

Fig. Replacing the timing chain-104 engine shown

  1. Attach a new timing chain (5) to the old chain (4) with a master link (6), center plate (7) and end plate (8). Using a socket wrench on the crankshaft, slowly rotate the engine in the direction of normal rotation. Simultaneously, pull the old chain through until the master link is uppermost on the camshaft sprocket (9). Be sure to keep tension on the chain throughout this procedure.
  2.  
  3. Disconnect the old timing chain and connect the ends of the new chain with the master link. Insert the new connecting link from the rear so the lockwashers can be seen from the front.
  4.  
  5. Rotate the engine until the timing marks align. Check the valve timing.
  6.  
  7. Install or connect the following:

    Engine timing covers
     
    Valve covers
     
    Spark plugs
     
    Negative battery cable
     

  8.  
  9. Start the engine and check operation.
  10.  

 
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