Mercedes-Benz Truck 2000-05

Timing Chain Cover, Chain, Sprockets & Tensioner

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Removal & Installation



  1. Before servicing the vehicle, refer to the precautions in the beginning of this section.
  2.  
  3. Disconnect the negative battery cable.
  4.  
  5. Drain the cooling system and engine oil.
  6.  
  7. Remove or disconnect the following:
    NOTE
    The fan clutch is equipped with right-hand thread.


    WARNING
    The engine must not be rotated backwards.



    Engine cover
     
    Engine cooling fan, fan clutch, and fan shroud
     



    Upper and lower coolant hoses
     
    Accessory drive belt and tensioner
     
    Oil pan
     
    Oylinder head covers
     

  8.  
  9. Rotate the crankshaft clockwise to align the crankshaft timing marks at 40° After Top Dead Center (ATDC). Insure that the grooves in the camshafts (6 in the illustration) align with the cylinder head cover mating surface on the intake side of the cylinder heads.

    Click image to see an enlarged view

    Fig. Camshaft timing marks

  10.  
  11. Remove or disconnect the following:
    NOTE
    The timing chain cover bolts are different lengths and diameters. Note their locations for installation.



    Air conditioning compressor and power steering pump and position them to the side. Do not remove the air conditioning or power steering hoses.
     
    Generator
     
    Timing chain tensioner
     
    Crankshaft pulley
     
    Air pump, if equipped
     
    Coolant Temperature (CT) sensor
     



    Timing chain cover
     

  12.  
  13. Lock the camshafts using the Camshaft Locking tools 112-589-00-32-00 and 112-589-01-32-00.

    Camshaft sprockets bolts
     
    Timing chain
     

  14.  

To install:

  1. Align the copper plated links of the timing chain with the marks on the camshaft sprockets, the crankshaft sprocket, and the balancer sprocket for the 3.2L engine. The 4.3L engine uses an idler sprocket in place of the balance shaft.
  2.  
  3. Install or connect the following:

    Camshaft sprockets along with the timing chain. Tighten the attaching bolts to 37 ft. lbs. (50 Nm) plus 90-100 degrees.
     

  4.  
  5. Clean the sealing surfaces and apply a bead of silicone sealant to the timing chain cover.
    NOTE
    The cover must be installed within ten minutes after the sealant is applied.



    Timing cover. Refer to the illustration for bolt placement. Tighten the bolts to 15 ft. lbs. (20 Nm).

    Click image to see an enlarged view

    Fig. Timing cover bolt placement

     
    CT sensor
     
    Timing chain tensioner
     
    Generator
     
    Crankshaft pulley and tighten the bolt to 148 ft. lbs., then tighten another 95 degrees
     
    Air pump, if equipped
     
    Air conditioning compressor and the power steering pump
     
    Cylinder head covers
     
    Oil pan
     
    Accessory drive belt and tensioner
     
    Upper and lower coolant hoses
     
    Fan shroud, cooling fan, and fan clutch
     

  6.  
  7. Fill the cooling system and the crankcase to the correct levels.

    Engine cover
     
    Negative battery cable
     

  8.  
  9. Read fault memory, encode the radio and normalize the power windows.
  10.  

 
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