Mercedes-Benz Truck 2000-05

Rocker Arms & Shafts

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The rocker arm/shaft is part of the camshaft bearing cap assembly and is called the camshaft bearing bridge. This procedure is for removing and installing the camshaft bearing bridge.

The rocker arm/shaft is part of the camshaft bearing cap assembly and is called the camshaft bearing bridge. This procedure is for removing and installing the camshaft bearing bridge.

Removal & Installation



The rocker arm/shaft is part of the camshaft bearing cap assembly and is called the camshaft bearing bridge. This procedure is for removing and installing the camshaft bearing bridge.

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

    Negative battery cable
     
    Cylinder head cover
     

  4.  
  5. Rotate the engine clockwise to position the crankshaft 40 degrees After Top Dead Center (ATDC).
  6.  


WARNING
The engine must not be rotated backward.



Generator
 
Timing chain tensioner
 

  1. Cable tie the timing chain to the camshaft sprocket.

    Camshaft bearing bridge bolts in the reverse order of installation, starting at 16 for the 3.2L engine, and 20 for the 4.3L engine
     

  2.  


NOTE
The camshaft bearing bridge must not be disassembled. If damage exists at the valve gear or at the top half of the camshaft bearing journal, the complete cylinder head should be replaced.



Click image to see an enlarged view

Fig. Camshaft bearing bridge bolt removal sequence-3.2L and 3.7L engines



Click image to see an enlarged view

Fig. Camshaft bearing bridge bolt removal sequence -4.3L and 5.0L engine

To install:

  1. Lubricate the camshaft bearing journals.
  2.  
  3. Install or connect the following:

    Camshaft bearing bridge and tighten the bolts to 88 inch lbs. (10 Nm) plus 90° in the reverse of the removal sequence.
     

  4.  
  5. Remove the cable ties from the camshaft sprockets.

    Timing chain tensioner with a new gasket and tighten to 59 ft. lbs. (80 Nm)
     
    Cylinder head covers and tighten the bolts to 88 inch lbs. (10 Nm)
     
    Negative battery cable
     

  6.  
  7. Read fault memory, encode the radio and normalize the power windows.
  8.  
  9. Start the vehicle and check for leaks.
  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
     

  4.  
  5. Rotate the engine clockwise to position the crankshaft 40 degrees After Top Dead Center (ATDC).
    WARNING
    The engine must not be rotated backwards.



    Generator
     
    Timing chain tensioner
     

  6.  
  7. Cable tie the timing chain to the camshaft sprocket.
    NOTE
    The camshaft bearing bridge must not be disassembled. If damage exists at the valve gear or at the top half of the camshaft bearing journal, the complete cylinder head should be replaced.



    Camshaft bearing bridge bolts in the reverse order of installation, starting at 16 for the 3.2L engine, and 20 for the 4.3L engine
     



    Click image to see an enlarged view

    Fig. Exploded view of the camshaft bearing bridge removal components-3.2L engine



    Click image to see an enlarged view

    Fig. Camshaft bearing bridge-4.3L Engine

  8.  

To install:

  1. Lubricate the camshaft bearing journals.
  2.  
  3. Install or connect the following:

    Camshaft bearing bridge and tighten the bolts to 11 ft. lbs. (15 Nm) in sequence as illustrated
     

  4.  
  5. Remove the cable ties from the camshaft sprockets.

    Timing chain tensioner with a new gasket and tighten to 59 ft. lbs. (80 Nm)
     
    Cylinder head covers and tighten the bolts to 88 inch lbs. (10 Nm)
     
    Negative battery cable
     

  6.  
  7. Read fault memory, encode the radio and normalize the power windows.
  8.  
  9. Start the vehicle and check for leaks.
  10.  

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

    Negative battery cable
     
    Cylinder head cover
     

  4.  
  5. Rotate the engine clockwise to position the crankshaft 40 degrees After Top Dead Center (ATDC).
    WARNING
    The engine must not be rotated backward.



    Generator
     
    Timing chain tensioner
     

  6.  
  7. Cable tie the timing chain to the camshaft sprocket.
    NOTE
    The camshaft bearing bridge must not be disassembled. If damage exists at the valve gear or at the top half of the camshaft bearing journal, the complete cylinder head should be replaced.



    Camshaft bearing bridge bolts in the reverse order of installation, starting at 16 for the M112 engine, and 20 for the M113 engine
     



    Click image to see an enlarged view

    Fig. Camshaft bearing bridge bolt removal sequence-M112 engines



    Click image to see an enlarged view

    Fig. Camshaft bearing bridge bolt removal sequence -M113 engine

  8.  

To install:

  1. Lubricate the camshaft bearing journals.
  2.  
  3. Install or connect the following:

    Camshaft bearing bridge and tighten the bolts to 88 inch lbs. (10 Nm) plus 90° in the reverse of the removal sequence.
     

  4.  
  5. Remove the cable ties from the camshaft sprockets.

    Timing chain tensioner with a new gasket and tighten to 59 ft. lbs. (80 Nm)
     
    Cylinder head covers and tighten the bolts to 88 inch lbs. (10 Nm)
     
    Negative battery cable
     

  6.  
  7. Read fault memory, encode the radio and normalize the power windows.
  8.  
  9. Start the vehicle and check for leaks.
  10.  

 
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