Altima 2007-2009

Timing Chain, Sprockets, Front Cover & Seal

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Removal & Installation



2.5L Engine

Specific to:

Nissan Altima 2007-2008

  1. Raise and safely support the vehicle.
  2.  
  3. Remove the oil pan.
  4.  
  5. Remove the alternator.
  6.  
  7. Disconnect variable timing control solenoid harness connector.
  8.  
  9. Remove the coolant overflow reservoir.
  10.  
  11. Position the engine compartment fuse and relay box aside.
  12.  
  13. Remove the right engine mount and bracket.
  14.  
  15. Remove the camshaft timing control (IVT) cover using.
  16.  
  17. Pull the chain guide (between camshaft sprockets) out through front cover.
  18.  
  19. Set the No.1 cylinder at TDC on the compression stroke. Make sure the timing marks on the camshaft sprockets are aligned. See Camshaft Removal and Installation.
  20.  
  21. Hold the crankshaft pulley and loosen but do not remove the crankshaft pulley bolt.
  22.  
  23. Remove the crankshaft pulley with a bolt-on puller. Do not use a claw type puller.
  24.  
  25. Remove the timing cover bolts in reverse of the tightening sequence.

    Click image to see an enlarged view

    Fig. Timing chain cover bolt torque sequence-2.5L engine

  26.  
  27. Push in the chain tensioner plunger and secure it with a stopper pin in the hole on the tensioner body. Remove chain tensioner.
  28.  
  29. Remove the timing chain.
  30.  
  31. If necessary, hold the hexagonal part of the camshaft with a wrench and loosen the camshaft sprocket bolt and remove the camshaft sprocket.
    WARNING
    Do not rotate the crankshaft or camshafts while the timing chain is removed. This is an interference engine.

  32.  
  33. To remove the balance shaft chain, compress the chain guide tensioner and remove the tensioner, guide, timing chain, and oil pump drive spacer.
    NOTE
    The balance shaft bolts must be replaced once removed.



    Click image to see an enlarged view

    Fig. Release tab A to compress chain guide tensioner B and insert pin D in hole C to lock it in place-2.5L engine

  34.  
  35. Secure the left balancer shaft with a wrench and loosen the sprocket bolt.
  36.  
  37. Remove balancer unit timing chain, balancer unit sprocket and crankshaft sprocket.

    Click image to see an enlarged view

    Fig. Timing chain and balance shaft chain components-2.5L engine

  38.  

To install:


NOTE
There may be two color variations of the link marks (link colors) on the timing chain. There are 26 links between the gold/yellow marks on the timing chain; and 64 links between the camshaft sprocket gold/yellow link and the crankshaft sprocket orange/blue link on the timing chain side without the tensioner.

  1. Make sure the crankshaft key points straight up.

    Click image to see an enlarged view

    Fig. Balance shaft assembly bolt torque sequence-2.5L engine

  2.  
  3. Use new bolts for the balance shaft assembly and oil the threads before installation. Install the balancer unit and tighten the bolts in numerical in the following steps:

    Step 1: Bolts 1-5, 31 ft. lbs. (42 Nm): Bolt 6, 27 ft. lbs. (36 Nm)
     
    Step 2: Bolts 1-5, 120°: Bolt 6, 90°
     
    Step 3: Loosen in reverse order or tightening sequence
     
    Step 4: Bolts 1-5, 31 ft. lbs. (42 Nm): Bolt 6, 27 ft. lbs. (36 Nm)
     
    Step 5: Bolts 1-5, 120°: Bolt 6, 90°
     

  4.  
  5. Install the crankshaft sprocket and timing chain for the balancer unit. Make sure the crankshaft sprocket mark is at the top to align with the mark on the block. The orange or blue link on the chain aligns with this same mark, while the gold or yellow link aligns with the mark on the balance shaft sprocket.
  6.  
  7. Install balancer timing chain tensioner and remove the stopper pin. Make sure the timing marks are still aligned.
  8.  
  9. Install the camshaft timing chain and related parts.

    Click image to see an enlarged view

    Fig. Timing mark alignment-2.5L engine

  10.  
  11. After installing timing chain tensioner, remove the stopper pin and make sure that the tensioner moves freely.
  12.  
  13. Rotate the crankshaft two full turns and make sure all timing marks still line up.
  14.  
  15. Install a new front oil seal
  16.  
  17. Carefully clean all sealing surfaces and apply RTV sealant to the timing cover. Install the cover and torque bolts A and D to 36 ft. lbs. (49 Nm) and bolts B and C to 9 ft. lbs. (13 Nm).
  18.  
  19. Carefully clean all sealing surfaces and apply RTV sealant to the rocker cover. Install the cover
  20.  
  21. Install IVT solenoid valve to IVT cover with a new O-ring.
  22.  
  23. Apply RTV sealant to the IVT cover and install it. Torque the bolts in order to 9 ft. lbs. (13 Nm).
  24.  
  25. Install crankshaft pulley and torque bolt to 31 ft. lbs. (42 Nm) plus 60°.
  26.  
  27. Install remaining components.
  28.  

3.5L Engine

Specific to:

Nissan Altima 2007-2008

  1. Remove the engine cover.
  2.  
  3. Relieve fuel system pressure.
  4.  
  5. Remove the air cleaner case and mass air flow sensor.
  6.  
  7. Remove the engine coolant reservoir.
  8.  
  9. Remove the windshield wipers and cowl.
  10.  
  11. Remove the IPDM E/R (fuse and relay box) and position aside.
  12.  
  13. Raise and safely support the vehicle and remove the front wheels
  14.  
  15. Remove the engine undercover and right inner fender.
  16.  
  17. Remove the drive belt, idler pulley and drive belt auto-tensioner.
  18.  
  19. Properly discharge and recover the air conditioning refrigerant and remove the A/C compressor.
  20.  
  21. Remove engine oil cooler pipe bolts.
  22.  
  23. Remove the power steering pump and reservoir with lines attached and position them aside.
  24.  
  25. Remove the alternator.
  26.  
  27. Disconnect the engine harness and position aside.
  28.  
  29. Remove the A/C low-pressure flexible hose. Cap the openings to keep out dirt and moisture.
  30.  
  31. Support the engine and remove the right engine mount and bracket.
  32.  
  33. Remove the water pump cover.
  34.  
  35. Remove the IVT covers.
    NOTE
    The shaft in the cover is inserted into the center hole of the intake camshaft sprocket. Remove the cover by pulling straight out until the cover disengages from the camshaft sprocket.

  36.  
  37. Remove the starter.
  38.  
  39. Remove the upper intake manifold.
  40.  
  41. Remove the ignition coils and spark plugs. Note the coil-s locations for installation.
  42.  
  43. Remove the rocker covers.
  44.  
  45. Set the engine to TDC of No. 1 cylinder.
  46.  
  47. Lock the drive plate or flywheel in place with a locking tool attached to the starter bolt hole. Take care to not damage the ring gear teeth or the signal plate teeth behind the ring gear.
  48.  
  49. Loosen crankshaft pulley bolt but do not remove it.
  50.  
  51. Position a puller on the crankshaft pulley. Make sure the puller grabs the inside of the pulley close to the bolt, not the outside diameter of the pulley. Remove the crankshaft pulley.
  52.  
  53. Remove the oil pans. Temporarily reinstall the lower oil pan.
  54.  
  55. Support front of engine with a suitable jack.
  56.  
  57. Remove the front timing chain cover bolts in the reverse of installation order.

    Click image to see an enlarged view

    Fig. Timing chain cover bolt torque sequence-3.5L engine

  58.  
  59. Make sure the engine is still at TDC and make paint marks on the timing chain and sprockets to indicate the correct position of the components for installation.
  60.  
  61. Remove the internal chain guide.
  62.  
  63. To remove the timing chain tensioner-

    Push the lever down to release plunger latch.
     
    Partially insert a pin to hold the lever down.
     
    Push the plunger in and hold it.
     
    Remove the locking pin, raise the lever and reinsert the pin all the way.
     
    Remove the timing chain tensioner.

    Click image to see an enlarged view

    Fig. Pin the lever down to unlatch the stopper tab, push the plunger in, then raise the lever and pin the plunger in place.



    Click image to see an enlarged view

    Fig. Timing chains installed-3.5L engine

     

  64.  
  65. Remove the primary timing chain and sprockets:
  66.  
  67. To remove the secondary chain:
    WARNING
    Even with the stopper pin inserted, the plunger can come out of the tensioner when timing chain is removed. Use caution during removal.


    NOTE
    The intake camshaft sprocket is an assembly of primary and secondary sprockets. Do not disassemble.



    Paint alignment marks on the chains and sprockets.
     
    Hold the camshaft with a wrench and loosen the sprocket bolt.
     
    Insert a stopper pin into the chain tensioners.
     
    Rotate camshaft slightly to slacken timing chain. Make sure the chain comes out of the guide groove in the tensioner.
     
    Insert a thin plate between the chain and tensioner.
     
    Remove cam sprockets and secondary timing chain together.
     



    Click image to see an enlarged view

    Fig. Timing chain assembly-3.5L engine

  68.  

To install:

  1. Replace the front main seal.
  2.  
  3. If removed, install the timing chain tension guide.
  4.  
  5. Make sure the crankshaft is at TDC of No. 1 piston. Make sure the camshaft dowel pin holes are both at the top and the crankshaft key is aligned with the right bank of cylinders.
    WARNING
    The dowel pin holes are the small diameter holes for camshaft sprocket dowel pins. Do not misidentify.

  6.  
  7. To install the secondary timing chains:
    NOTE
    There are two types of matching marks, round (7 and 10) for the left cylinder bank and oval (4 and 5) for the right.



    Compress the secondary chain tensioner and secure it with a stopper pin. Install the tensioner.

    Click image to see an enlarged view

    Fig. Secondary timing chain alignment marks-3.5L engine

     
    On a flat surface, assemble the camshaft sprockets and timing chains with all the match marks aligned. Align marks 4, 5, 7 and 10 on the secondary timing chain (8) (orange link) with the ones on the intake and exhaust sprockets (stamped). Matching marks for the intake sprocket are on the back side of the secondary sprocket.
     



    Fit the chain and sprocket assemblies into place on the camshafts, making sure the dowel pins align properly. Install the sprocket bolts finger tight just to hold the sprockets in place.
     
    Check chain and sprocket alignments again.
     
    Hold each camshaft and torque the sprocket bolt to 76 ft. lbs. (103 Nm).
     
    Remove the tensioner stopper pins and check timing mark alignments again.
     

  8.  
  9. Install the crankshaft sprocket. Make sure the mating marks on the crankshaft sprocket face the front of the engine.
  10.  
  11. Install the primary timing chain. Make sure the punched mark on the camshaft sprocket is aligned with the pink link on the timing chain, while the notched mark on the crankshaft sprocket is aligned with the orange one on the timing chain. During alignment, be careful to avoid disturbing the secondary timing chain alignment.
  12.  
  13. Install the chain guide and slack guide. Do not overtighten the slack guide bolts. It is normal for a gap to exist under the bolt seats.
  14.  
  15. Install the timing chain tensioners. After installation, pull out the stopper pin while holding the slack guide.
  16.  
  17. Temporarily install the crankshaft pulley and bolt and rotate the crankshaft two full turns. Reconfirm that all timing marks are still properly aligned.
  18.  
  19. Install new O-rings on the rear timing chain case and install the front timing chain case (front cover).
  20.  
  21. Install remaining components.
  22.  
  23. Activate the fuel system. Check for any leaks when the system is repressurized and correct as necessary.
  24.  
  25. Start the engine and check all systems for leaks. Rev engine to 3,000 rpm under no load to purge air from the high-pressure oil chamber of the chain tensioners. The engine may produce a rattling noise. This indicates that air still remains in the chamber and is not a matter of concern.
  26.  

 
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