9-3 1999

Camshaft & Bearings

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Removal & Installation



  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
     
    Ignition module cartridge
     
    Valve cover
     
    Crankcase ventilation hose
     

  4.  
  5. Position the crankshaft at Top Dead Center (TDC). The 0 mark on the flywheel should align with the timing mark on the bell housing end plate. The camshafts should be lined up with their respective timing marks.
    WARNING
    Use a proper holding tool to hold the camshafts from rotating. Always keep the camshafts in their correct basic setting. If the setting of the crankshaft or camshafts is altered at this stage the valves can be damaged.



    Oil pipes
     
    Center bolts securing the camshaft sprockets
     



    Timing chain tensioner
     
    Camshaft sprockets
     

  6.  
  7. Mark the bearing cap positions and relation to the front of the engine. The caps must be installed in their original location.
  8.  
  9. Loosen the camshaft bearing cap bolts 1 turn at a time to avoid uneven valve spring pressure on the camshafts. When all bolts are loose, remove the bearing caps and lift out the camshafts.
  10.  

To install:

  1. Place the camshafts in their proper positions and install the bearing caps in their original location.
  2.  
  3. When installing the bolts, tighten them 1 turn at a time to draw the camshaft down evenly against the valve springs. Torque the bearing cap bolts to 11 ft. lbs. (15 Nm).
    NOTE
    The black bolts have an oiling passage and must be installed on the spark plug side.

  4.  
  5. Install or connect the following:

    Camshaft sprockets. Exhaust cam is installed first. Hand-tighten the center bolts securing the camshaft sprockets.
     
    Timing chain tensioner with the piston under tension. Be sure the copper gasket is in good condition and that the sealing surface is clean and free from burrs. Torque the tensioner to 47 ft. lbs. (63 Nm).
     

  6.  
  7. Trigger the chain tensioner by pressing the pivoting chain guide against it. Thereafter, press the pivoting guide against the chain to give the chain its basic tension. Check that the chain tensioner maintains tension on the chain when the pressure on the chain guide is released and that the basic setting stop for the tensioner holds the chain guide tight against the chain. A limited amount of play will be present until the hydraulic pressure takes over once the engine is running.
  8.  
  9. Depress the pivoting guide to check that the tensioner is working. Rotate the crankshaft 2 complete turns clockwise, viewed from the transmission end. Be sure the crankshaft and camshaft timing marks still align properly.
  10.  
  11. Hold the camshafts in their proper position and torque the cam sprocket bolts to 49 ft. lbs. (67 Nm).
  12.  
  13. Install or connect the following:

    Oil pipes
     
    Valve cover and torque the bolts to 11 ft. lbs. (14 Nm)
     
    Crankcase ventilation hose
     
    Ignition module cartridge
     
    Negative battery cable
     

  14.  
  15. Start the engine, check for leaks and repair if necessary.
  16.  

 
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