Mercedes Timing Chain Cover, Chain, Sprockets & Tensioner: Camshaft timing marks for Mercedes Benz?

The complete detail for Camshaft timing marks.
Timing Chain Cover, Chain, Sprockets & Tensioner.
The details will work for all types of Mercedes Benz Truck model vehicle.

Removal & Installation

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

    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
  5. 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. 

    Fig. Camshaft timing marks
  6. Remove or disconnect the following:
    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.
    Timing chain tensioner
    Crankshaft pulley
    Air pump, if equipped
    Coolant Temperature (CT) sensor

    Timing chain cover
  7. Lock the camshafts using the Camshaft Locking tools 112-589-00-32-00 and 112-589-01-32-00.

    Camshaft sprockets bolts
    Timing chain
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. 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.
  3. Clean the sealing surfaces and apply a bead of silicone sealant to the timing chain cover. 
    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). 

    Fig. Timing cover bolt placement
    CT sensor
    Timing chain tensioner
    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
  4. Fill the cooling system and the crankcase to the correct levels.

    Engine cover
    Negative battery cable
  5. Read fault memory, encode the radio and normalize the power windows.

These details will help.


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