Infinity_FX35_FX45_2003-2005

Timing Chain & Sprockets (2 of 2)

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Removal & Installation



4.5L Engine


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Fig. Exploded view of the timing chain and related components-4.5L engine



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Fig.



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Fig. Intake valve timing control cover tightening sequence-4.5L engine



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Fig. Timing chain front cover O-ring locations-4.5L engine



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Fig. With the engine positioned at TDC on No. 1 cylinder, the camshaft lobes should be positioned as shown-4.5L engine



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Fig. Use a ring gear holder to fix the crankshaft to loosen the crankshaft pulley bolt-4.5L engine



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Fig. Front timing chain cover mounting bolt tightening sequence-4.5L engine



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Fig. O-ring positions on engine block and cylinder heads-4.5L engine



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Fig. Timing chain tensioner details-4.5L engine



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Fig. Timing chain positioning for installation-4.5L engine



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Fig. Crankshaft positioning for timing chain installation-4.5L engine



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Fig. Crankshaft sprocket orientation for installation on the crankshaft-4.5L engine



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Fig. Install the front timing cover front seal as shown-4.5L engine



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Fig. Liquid gasket positioning for timing chain cover installation-4.5L engine



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Fig. Front timing chain cover mounting bolt tightening sequence-4.5L engine



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Fig. Front timing chain cover mounting bolt identification-4.5L engine



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Fig. Intake valve timing control cover liquid gasket positioning for installation-4.5L engine



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Fig. Intake valve timing control cover mounting bolt tightening sequence-4.5L engine.

  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. Remove the engine assembly from the vehicle.
  4.  
  5. Remove the drive belt auto tensioner and idler pulley, as follows:
    1. Remove the front engine undercover.
    2.  
    3. Remove the drive belts.
    4.  

  6.  
  7. Remove the thermostat housing and hoses.
  8.  
  9. Remove the ignition coil.
  10.  
  11. Remove the rocker cover, as follows:
    1. Remove the engine cover.
    2.  
    3. Remove the inlet air duct, air cleaner case and mass air flow sensor assembly, air duct and resonator assembly.
    4.  
    5. Move the wiring harness on the upper rocker cover and its peripheral aside.
    6.  
    7. Remove the wiring harness brackets from the No. 6 camshaft bracket.
    8.  
    9. Remove the electric throttle control actuator.
    10.  
    11. Remove the ignition coil.
    12.  
    13. Remove the PCV hose from the PCV valve.
    14.  
    15. Move the wiring harness on the upper rocker cover.
    16.  
    17. Remove the ignition coil.
    18.  
    19. Remove the PCV hose from the PCV valve.
    20.  
    21. Remove the grommets from the right and left cowl top panel. For the right side grommet, remove the battery, battery tray, then the grommet.
    22.  
    23. Loosen the rocker cover bolts in reverse order as shown.
      CAUTION
      Do not hold the oil filler neck on the right bank so that it is not damaged.


      NOTE
      Loosen No. 10 bolt of the right bank and No. 10 and No. 12 bolts at the left bank from cowl top panel hole.

    24.  
    25. Use a scraper to remove all traces of the liquid gasket from the cylinder head and camshaft bracket.
    26.  

  12.  
  13. If necessary, remove the intake valve timing control position sensor (right and left banks) and the camshaft position sensor (PHASE) from the intake valve timing control cover and front cover.
    CAUTION
    Handle the sensors carefully to avoid dropping and/or shocking them. Also, do not disassemble them. Do not allow metal powder to adhere to the magnetic part at the sensor tip. Do not place sensors in a location where they are exposed to magnetism.

  14.  
  15. If necessary, remove the intake valve timing control solenoid valve from the intake valve timing control cover.
  16.  
  17. Remove the intake valve timing control cover, as follows:
    1. Loosen and remove the mounting bolts in the reverse order shown.
    2.  
    3. Use a seal cutter to cut the liquid gasket for removal.
      CAUTION
      Exercise care not to damage the mating surfaces. Pull out the cover keeping it level, since an inner part of the cover is engaged with the center of the camshaft sprocket (INT).

    4.  

  18.  
  19. Remove the O-rings from the front cover.
  20.  
  21. Position the crankshaft with No. 1 cylinder at TDC of its compression stroke, as follows:
    1. Rotate the crankshaft pulley clockwise to align the TDC identification notch (without paint mark) with the timing indicator on the front cover.
    2.  
    3. Make sure that both intake and exhaust camshaft lobes of the No. 1 cylinder (engine front side of left bank) are located as shown in the figure.
    4.  
    5. If the camshaft lobes are not positioned appropriately, turn the crankshaft pulley one revolution (360 degrees) and align it as shown.
    6.  

  22.  
  23. Remove the crankshaft pulley, as follows:
    1. Remove rear plate cover, and install the ring gear stopper or equivalent.
    2.  
    3. Loosen the crankshaft pulley bolt, and then pull the crankshaft pulley with both hands to remove it.
      CAUTION
      Do not completely remove the crankshaft pulley bolt. Keep the loosened crankshaft pulley bolt in place to protect the removed crankshaft pulley from dropping. Do not remove the balance weight (inner hexagonal bolt) at the front of the crankshaft pulley.

    4.  

  24.  
  25. Remove the oil pan and oil strainer.
  26.  
  27. Remove the front cover, as follows:
    1. Loosen the mounting bolts in the reverse order shown.
    2.  
    3. Use a seal cutter to cut the liquid gasket.
      CAUTION
      Exercise care not to damage mating surfaces. After removal, handle the front cover carefully so it does not tilt, cant, or warp under load.

    4.  

  28.  
  29. Remove the front oil seal from the front cover using a suitable thin-bladed pry tool.
    CAUTION
    Be careful not to damage the front cover.

  30.  
  31. Remove the O-rings from both cylinder heads and cylinder block.
  32.  
  33. Remove the chain tensioner cover from the front cover. Use a seal cutter to cut the liquid gasket for removal.
  34.  
  35. Remove the oil pump drive spacer, by setting bolts in the two bolt holes (M6 -pitch) on the front surface. Using a suitable puller, pull on the oil pump drive spacer off the crankshaft.
    NOTE
    The dimension between the centers of the two bolt holes is 1.30 in. (33mm).

  36.  
  37. Remove the oil pump.
  38.  
  39. Remove the chain tensioner from the left bank, as follows:
    NOTE
    To remove timing chain and related parts, start with those on left bank. The procedure for removing parts on right bank is omitted because it is the same as that for the left bank.

    1. While lightly pressing the tensioner plunger, depress the tensioner tab in (or turn the lever in the direction of the arrow in the accompanying illustration) to unlock the mechanism that stops the tensioner plunger.
    2.  
    3. Push in the tensioner plunger to align the hole on the lever and that on the pump main body. If you push in the tensioner too far, the holes will not align. Therefore, push in the plunger to the degree at which the start of stopper groove and tab engages.
    4.  
    5. Insert a stopper pin (hard wire approximately 0.020 in./0.5mm thick or similar tool) to hold the plunger in position. With the plunger held, remove the chain tensioner.
    6.  

  40.  
  41. Remove the chain tension guide and timing chain slack guide.
  42.  
  43. Remove the timing chain and crankshaft sprocket.
    CAUTION
    After removing the timing chain, do not turn the crankshaft and camshaft separately, or the valves will strike the piston head.

  44.  
  45. With the hexagonal part of the camshaft held with a wrench, loosen the bolts securing the camshaft sprocket.
  46.  
  47. Perform the same procedure on the right side.
  48.  
  49. Use a scraper to remove all traces of old liquid gasket from the front cover and opposite mating surfaces. Remove the oil liquid gasket from the bolt holes and threads.
  50.  
  51. Use scraper to remove all trace of liquid gasket from the chain tensioner cover and the intake valve timing control covers.
  52.  
  53. Check the timing chain for cracks and any excessive wear at the roller links and link plates. Replace the timing chain as necessary.
  54.  

To install:


NOTE
The accompanying illustration shows the relationship between the mating mark on each timing chain and that on the corresponding sprocket, with the components installed. Parts with an identification mark (R or L) should be installed on the corresponding bank according to the mark. Parts with an identification mark include:



Camshaft sprocket (INT)
 
Dowel pin groove of camshaft sprocket (EXH) (camshaft sprocket is same part both banks)
 
Chain tension guide
 
Chain slack guide
 
Because of parallel manufacture, there are two types of mark (link colors) for timing chains.
 


NOTE
To install the timing chain and related parts, start with those on right bank. The procedure for installing parts on left bank is omitted because it is the same as that for the right bank.

  1. Make sure that the crankshaft key and dowel pin of each camshaft are located as shown in the figure with the crankshaft at No. 1 cylinder at compression TDC. The positioning is as follows:
    NOTE
    Though the camshaft may not stop at the position as shown in the figure, for the placement of camshaft lobe nose, it is generally accepted that the camshaft is placed for the same direction of the figure.



    Camshaft dowel pin-At the cylinder head upper face side in each bank
     
    Crankshaft key-At the cylinder head side of left bank
     

  2.  
  3. Install the camshaft sprockets, while heeding the following items:

    Install the sprockets onto the correct side by checking with the identification mark on surface.
     
    Install the camshaft sprocket (EXH) by selectively using the groove of the dowel pin according to the bank. (Common part used for both banks.)
     
    Lock the hexagonal part of the camshaft in the same procedure as removal, and tighten the mounting bolts.
     

  4.  
  5. Install the crankshaft sprockets for both banks. Install each crankshaft sprocket so that its flange side (the larger diameter side without teeth) faces in the direction shown.
    NOTE
    The same parts are used but facing directions are different.

  6.  
  7. Install the timing chains and related parts, as follows:
    1. Align the mating mark on each sprocket and timing chain for installation.
    2.  
    3. After the mating marks are aligned, keep them aligned by holding them in position by hand.
      NOTE
      Before installing the chain tensioner, it is possible to change the position of the mating mark on the timing chain for that on each sprocket for alignment.

    4.  
    5. Install the slack guides and tension guides onto the correct side by checking with the identification mark on the surface.
    6.  
    7. Install the chain tensioner with the plunger fixed as described in its removal.
      CAUTION
      Before and after the installation of the chain tensioner, make sure that the mating mark on the timing chain is not out of alignment.

    8.  
    9. After installing the chain tensioner, remove the stopper pin to release the tensioner. Make sure the tensioner is released.
    10.  
    11. To avoid chain-link skipping of timing chain teeth, do not move the crankshaft or camshafts until the front cover is installed.
    12.  

  8.  
  9. Perform the same procedure on the right bank, installing the timing chain and related parts on the left side.
  10.  
  11. Install the oil pump.
  12.  
  13. Install the oil pump drive spacer, as follows:
    1. Insert the oil pump drive spacer according to the directions of the crankshaft key and the two flat surfaces of the oil pump inner rotor.
      NOTE
      If the positional relationship does not allow the insertion, rotate the oil pump inner rotor by finger to allow spacer.

    2.  
    3. After confirming that the position of each part is in correct condition to allow for spacer, force fit the spacer by lightly tapping it with a plastic hammer until it contacts and does not go further.
    4.  

  14.  
  15. Install the front oil seal in the front cover, as follows:
    1. Apply new engine oil to both the oil seal lip and the dust seal lip.
    2.  
    3. Position the seal so that each seal is oriented as shown, then, using a suitable drift, press the front oil seal into the front cover until the face of the oil seal is flush with the mounting surface. The drift used to seat the oil seat should have an outside diameter of 2.20 in. (56mm) and inner diameter of 1.93 in. (49mm).
      CAUTION
      Be careful not to scratch or make burrs on the circumference of the oil seal.

    4.  
    5. Make sure the garter spring is in position and the seal lips not inverted.
    6.  

  16.  
  17. Install the chain tensioner cover on the front cover.
  18.  
  19. Apply a continuous bead of liquid gasket to the front cover as shown.
    NOTE
    Use Genuine RTV Silicone Sealant or equivalent.

  20.  
  21. Install the front cover, as follows:
    1. Install new O-rings onto the right and left cylinder heads and cylinder block.
    2.  

  22.  
  23. Apply a continuous bead of liquid gasket to the front cover as shown.
    NOTE
    Use Genuine RTV Silicone Sealant or equivalent.

    1. Make sure again that the mating marks on the timing chain and that on each sprocket are aligned. Then, install the front cover.
      CAUTION
      Be careful to avoid interference with the front end of the oil pump drive spacer. Such interference may damage the front oil seal.

    2.  
    3. Tighten the mounting bolts in numerical order shown. There are four type mounting bolts. The bolts are as follows:

      Position A: M6 x 20mm
       
      Position B: M6 x 45mm
       
      Position C: M6 x 80mm
       
      Position D: M6 x 25mm
       

    4.  
    5. After all bolts are tightened, retighten them in numerical order shown.
      CAUTION
      Be sure to wipe off any excessive liquid gasket leaking onto the surface mating with the oil pan.

    6.  

  24.  
  25. Install the intake valve timing control cover, as follows:
    1. At the back of the intake valve timing control cover, install new seal rings (three for each bank) to the area to be inserted into the camshaft sprocket (INT).
      CAUTION
      Do not spread the seal ring excessively to avoid breaks and deformation.

    2.  
    3. Install the new O-rings on the front cover.
    4.  
    5. Apply a continuous bead of liquid gasket to the intake valve timing control covers as shown.
      NOTE
      Use Genuine RTV Silicone Sealant or equivalent.

    6.  
    7. Tighten the mounting bolts in the numerical order shown.
    8.  

  26.  
  27. Install the intake valve timing control position sensor, intake valve timing control solenoid valve and camshaft position sensor (PHASE) on the intake valve timing control cover and front cover, if removed. Be sure to tighten the bolts with flanges completely seated.
  28.  
  29. Install the oil pan and oil strainer.
  30.  
  31. Install the crankshaft pulley, as follows:
    1. Hold the crankshaft with ring gear stopper SST: J-45476 or equivalent.
    2.  
    3. Install the crankshaft pulley, taking care not to damage the front oil seal. Install it according to the dowel pin of the oil pump drive spacer. Lightly tapping its center with plastic hammer, insert the pulley.
      CAUTION
      Do not tap the pulley on the side surface where the belt is installed (outer circumference).

    4.  
    5. Apply engine oil onto the threaded parts of crankshaft pulley bolt and seating area.
    6.  
    7. Tighten the crankshaft pulley bolt to 69 ft. lbs. (93 Nm).
    8.  
    9. Mark the crankshaft pulley to align it with the angle mark on the crankshaft pulley bolt.
    10.  
    11. Further tighten the pulley bolt 90 degrees. (Angle tightening) Check the tightening angle by referencing it to the notches. The angle between two notches is 90 degrees.
    12.  

  32.  
  33. Rotate the crankshaft pulley in the normal direction of rotation (clockwise when viewed from the front of the engine) to confirm it turns smoothly.
  34.  
  35. The remainder of installation is the reverse of removal.
    NOTE
    If hydraulic pressure inside the chain tensioner drops after removal/installation, slack in the guide may generate a pounding noise during and just after engine start. However, this is normal and the noise will stop after hydraulic pressure rises.

  36.  
  37. For rocker arm cover installation, perform the following:
    1. Apply liquid gasket to the joint part of the cylinder head and camshaft bracket as shown.
      NOTE
      The accompanying illustration shows an example of the left bank side (zoomed in shows camshaft bracket No. 1). Apply only to the camshaft bracket (No. 1) for the right bank side.

    2.  
    3. Refer to a in the illustration to apply liquid gasket to the joint part of the camshaft bracket (both No. 1 and No. 6) and the cylinder head.
    4.  
    5. Refer to b in the illustration to apply liquid gasket in 90 degrees to a.
      NOTE
      Use Genuine RTV Silicone Sealant or equivalent.

    6.  
    7. Install the rocker cover. Check if the rocker cover gasket does not fall from the installation groove of the rocker cover.
    8.  
    9. Tighten the bolts in two separate steps in the numerical order shown, as follows:
      CAUTION
      Do not hold the rocker cover by the oil filler neck (right bank) so that it won-t be damaged.


      NOTE
      Tighten No. 10 bolt of the right bank and No. 10 and No. 12 bolts of the left bank from cowl top panel hole.



      1st Step: 18 inch lbs. (2 Nm)
       
      2nd step: 73 inch lbs. (8.3 Nm)
       

    10.  

  38.  
  39. Perform the following once installation is complete:

    Before starting the engine, check the levels of engine coolant, lubrications and working fluid. If less than at the required level, fill them to the specified level.
     
    Run the engine to check for unusual noise and vibration.
     
    Warm up the engine thoroughly to make sure there is no leakage of engine coolant, engine oil, working fluid, fuel and exhaust gas.
     
    Bleed air from passages in pipes and tubes of applicable lines, such as in the cooling system.
     
    After cooling down the engine, again check the amounts of engine coolant, engine oil and working fluid. Refill them to the specified level, if necessary.
     

  40.  

 
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