Question about 2002 Nissan Altima

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Im trying to replace the timing chain on a 2002 nissa altimaa but i cann't get the timing chain cover of does anyone have a diagram plz

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  • ju_lior Aug 02, 2010

    thanks for your support

  • steve Sep 22, 2013

    06 nissan altima 2.5s oil balancer cover need to get off but there is a strange looking bolt holding it looks like i need a spanner tool to get it out but need to know the size

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  • Nissan Master
  • 17,970 Answers

Nissan Car Altima & Sentra 1999-06

Timing Chain Cover & Seal--Removal & Installation


2.4L Engine

  1. Before servicing the vehicle, refer to the Precautions section.
  2. Drain the cooling system.
  3. Drain the engine oil.
  4. Remove or disconnect the following:
    Negative battery cable Spark plug wires and set the No. 1 piston at the Top Dead Center (TDC) of the compression stroke Engine undercover Vacuum hoses, fuel hoses, wires, harness and connectors Drive belts Power steering reservoir Alternator and bracket, the upper radiator hose, the air duct and the front exhaust tube Intake manifold collector supports, intake manifold collector and the exhaust manifold Distributor
  5. Using a block of wood, set a transmission jack under the aluminum oil pan and remove the front engine mounting.
    Rocker cover. Remove the rocker cover bolts in the proper sequence. Camshaft sprockets

NOTE The stoppers on camshaft covers prevent the upper timing chain from disengaging from the idle sprocket.
Cam bearing caps in sequence Camshafts. The camshaft brackets must be loosened in reverse order of tightening to prevent damage to the camshaft.
NOTECylinder head bolts in the reverse order of installation
NOTE A warped or cracked cylinder head could result from loosening in incorrect order. The cylinder head bolts should be loosened in 2 or 3 steps. Cam sprocket cover Upper chain tensioner and upper chain guides Upper timing chain Idler sprocket bolt Cylinder head and the intake manifold Cylinder head gasket. The lower timing chain will not be disengaged from crankshaft sprocket.
NOTE The cast portion of the front cover is located on the lower side of the crankshaft sprocket, so the lower timing chain need not be disengaged from idler sprocket.
Steel oil pan bolts in the reverse sequence of the tightening procedure
  1. Install a seal cutter between the steel oil pan and the aluminum oil pan.
  2. Tapping the cutter with a hammer, slide it around the entire edge of the oil pan. Take care not to damage the aluminum oil pan.
  3. Remove or disconnect the following:
    Steel oil pan Baffle plate, oil strainer and the front tube
  4. Support the transaxle with a jack and the engine with a engine hoist.
    Front suspension member A/C compressor gussets Rear cover plate Aluminum oil pan retaining bolts in sequence
  5. Insert a seal cutter between the oil pan and the cylinder block.
  6. Tapping the cutter with a hammer, slide it around the entire edge of the oil pan. Take care not to damage the aluminum oil pan.
    Oil pan from the engine Crankshaft pulley Front timing chain cover Oil pump drive spacer Lower timing chain tensioner, tensioner arm and lower timing chain guide Lower timing chain and idler sprocket
To install:
  1. Install or connect the following:
    Crankshaft sprocket and oil pump drive spacer Idler sprocket and lower timing chain
  2. Set the lower timing chain on the sprockets, aligning the mating marks. The mating marks on the timing chain assembly will be silver.
    Chain tension arm and chain guide Lower timing chain tensioner
  3. Apply a continuous bead of liquid gasket to the front cover and install the front cover. Install a new oil seal.
    Crankshaft pulley and torque tighten bolt to 105-112 ft. lbs. (142-152 Nm)
  4. Carefully scrape the old gasket material away from the pan and cylinder block mounting surfaces, then apply a continuous 3.5-4.5mm wide bead of liquid gasket around the oil pan and the cylinder block.
    Aluminum oil pan and torque the bolts, in sequence, to 13 ft. lbs. (17.5 Nm) Baffle plate, oil strainer and the front tube Steel oil pan and torque the bolts, in sequence, to 61 inch lbs. (7 Nm) Rear cover plate A/C compressor gussets Front suspension member Front engine mounting and remove the engine hoist and transaxle support New cylinder head gasket Cylinder head and temporarily tighten the cylinder head bolts when installing the front cover. This is necessary to avoid damaging the cylinder head gasket. Be sure to install washers between the bolts and cylinder head. Upper timing chain, chain tensioner and chain guide
  5. Set the upper timing chain on idler sprockets, aligning the mating marks.
    Cam sprocket cover. Apply a continuous bead of liquid gasket to front cover. Be careful not to damage the cylinder head gasket. Be careful that the upper timing chain does not slip or jump when installing cam sprocket cover.
  6. Tighten cylinder head bolts.
    Camshafts and camshaft bearing caps Camshaft sprockets, then torque the sprocket bolts to 123-130 ft. lbs. (167-176 Nm). Install the chain guide between both camshaft sprockets. The alignment marks on the upper portion of the timing chain should now be aligned. Rocker cover Distributor Intake manifold collector supports and collector Exhaust manifold Alternator and bracket Upper radiator hose Air duct assembly Front exhaust tube Power steering reservoir Drive belts Vacuum hoses and fuel lines Engine under cover Spark plug wires Negative battery cable
  7. Fill the cooling system.
  8. Fill the engine with clean oil.
  9. Start the vehicle, check for leaks and repair if necessary.
continue...

Posted on Jul 31, 2010

  • 1 more comment 
  • ZJ Limited
    ZJ Limited Jul 31, 2010



    Fig. Be sure to align the mark on the idler sprocket with the mark
    on the upper chain-2.4L engines




    Fig. Align the marks on the camshaft sprockets with the upper
    portion of the upper timing chain and mating marks-2.4L engine





    Fig. Lower timing chain alignment marks-2.4L engine




    Removal & Installation - 1.6L
    Engine





    Fig. Be sure to align the camshaft sprockets with the timing
    chain-1.6L engine





    Fig. Positioning of camshaft knock pins during assembly-1.6L
    engine



    Removal & Installation - 2.0L Engine




    Fig. Timing chain sprocket alignment marks-2.0L engines


    Hope helps.


  • ju_lior Jul 31, 2010

    Hi;

    I thank you very much for your answet but I'm talking about a 2002 Nissan Altima engine 2.5 CTVC if you may have the diagram for this engien I will appreciated since in the crankshaft there 2 marks

  • ZJ Limited
    ZJ Limited Aug 02, 2010


    2.5L Engine









    Fig. Exploded view of the timing chain assembly-2.5L engine






    1. Before servicing the vehicle, refer to the Precautions section.


    2. Drain the engine oil.


    3. Drain the cooling system.


    4. Relieve the fuel system pressure.


    5. Disconnect the negative battery cable. Support the engine and transaxle with suitable tools.


    6. On Altima, remove or disconnect the following:


      Engine under cover

      Upper and lower oil pans
      Alternator
      Engine cover
      Variable timing control solenoid conector
      Engine ground
      Coolant reservoir tank
      Right side fuse and relay box and move aside
      Right engine mount and bracket





    7. On Sentra, remove or disconnect the following:


      Air cleaner and duct

      Spark plugs
      Valve cover
      Coolant reservoir tank
      Auxiliary drive belt tensioner
      Alternator
      Strut tower cross brace
      A/C compressor and wire aside
      Power steering pump and reservoir and wire aside
      Upper and lower oil pans





    8. On all models, remove or disconnect the following:


      Intake valve timing control cover in reverse of the tightening sequence

      Timing chain guide between the camshaft sprockets and through the front cover
      Rotate the crankshaft clockwise and set the No. 1 piston to TDC of the compression stroke
      Crankshaft pulley using a suitable puller
      Front timing chain cover bolts in reverse order of the tightening sequence









      Fig. Timing chain cover bolt removal sequence shown-2.5L engine






      Front timing chain case

      Insert a suitable stopper pin in the timing chain tensioner
      Chain tensioner





    9. While holding the camshaft with an open end wrench on the camshaft
      flat, remove the camshaft sprocket bolts and remove the camshaft
      sprockets.



    10. Remove the timing chain slack guide, tension guide, timing chain and oil pump drive spacer.


    11. Lift up on the timing chain tensioner lever for the balancer and release the ratchet.


    12. Push the tensioner sleeve in and hold.


    13. Insert a stopper pin to secure the tensioner sleeve


    14. Remove the balancer tensioner.


    15. Remove the timing chain for the balancer unit.


    16. Remove the balancer unit using the sequence shown.








    17. Fig. Balancer unit mounting bolts removal sequence shown-2.5L engine











      Fig. Balancer unit mounting bolts tightening sequence shown-2.5L engine











      Fig. Balancer timing chain alignment marks-2.5L engine











      Fig. Timing chain alignment marks-2.5L engine











      Fig. Timing chain cover bolt removal sequence shown-2.5L engine











      Fig. Intake valve timing control cover tightening sequence shown-2.5L engine






    To install:




    1. If replacement of the balancer bolts is not possible, perform the following bolt measurement:



      1. Measure the diameter of the head bolt 0.39 in. (10mm) from the bottom of the bolt.


      2. Measure the diameter of the head bolt 2.75 in. (70mm) from the bottom of the bolt.


      3. Whenever the size difference between the 2 measurements exceeds 0.0059 in. (0.15mm) the head bolts must be replaced.







    2. Apply clean engine oil to the bolt threads and seating surfaces and tighten the balancer bolts in sequence as follows:



      1. Step 1: 35 ft. lbs. (47 Nm).


      2. Step 2: Plus 90 degrees clockwise


      3. Step 3: Loosen all the bolts completely.


      4. Step 2: 29 ft. lbs. (33 Nm).


      5. Step 4: 35 ft. lbs. (47 Nm).


      6. Step 5: Plus 90 degrees clockwise







    3. Install the crankshaft sprocket and balancer timing chain and align the marks as shown.


    4. Install the balancer timing chain tensioner and remove the stopper pin.


    5. Install the timing chain and and align the timing marks as shown.


    6. Install the timing chain tensioner and remove the stopper pin.


    7. Using adrift, install a new oil seal in the front cover.


    8. Install new O-rings into the cylinder head and block.


    9. Apply a bead of sealant around the inside of the front cover sealing surface.


    10. Install the front cover and tighten the bolts in the sequence shown.


    11. Install the chain guide between camshaft sprockets.


    12. Install the intake valve timing control cover in the sequence shown and tighten the bolts to 10 ft. lbs. (13 Nm).


    13. Install the crankshaft pulley and tighten the bolt to 31 ft. lbs. (42 Nm), plus an additional 60°.


    14. The remainder of the installation is the reverse of the removal procedure.

    Hope helps.

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