Sentra 1997

Timing Chain Cover, Chain, Sprockets, & Seal

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Removal & Installation



1.6L & 1.8L Engines

Specific to:

Nissan Sentra 1997-2006

  1. Before servicing the vehicle, refer to the Precautions section.
  2.  
  3. Relieve the fuel system pressure.
  4.  
  5. Drain the cooling system.
  6.  
  7. Remove or disconnect the following:

    Negative battery cable
     
    Upper radiator hose
     
    Engine drive belts
     
    Power steering pulley and the pump with bracket
     
    Air duct from the intake manifold collector
     
    Right front wheel and engine side covers
     
    Engine undercovers
     
    Front exhaust pipe
     
    Cylinder head front mounting bracket
     
    Cylinder head cover from the engine
     
    Valve cover
     
    Distributor cap
     
    Spark plugs
     
    Intake manifold support and set the No. 1 piston at the Top Dead Center (TDC) compression stroke
     
    Distributor
     
    Cylinder head front cover
     
    Water pump pulley
     
    Thermostat housing
     
    Lower timing chain tensioner
     
    Upper timing chain tensioner and slack side timing chain guide
     
    Idler sprocket bolt
     
    Camshaft sprocket bolts and the sprockets from the camshafts. Be sure to mark the sprockets for proper reinstallation.
     
    Camshaft mounting caps by loosening the bolts in 2 or 3 steps
     
    Camshafts from the engine
     
    Idler sprocket bolt
     
    Cylinder head with the manifolds
     
    Idler sprocket shaft from the rear side
     
    Upper timing chain and support the engine assembly
     
    Center crossmember
     
    Oil pan and strainer assembly
     
    Crankshaft pulley
     
    Engine front mount and bracket
     
    Bolts that secure the front timing cover and the cover from the engine. Once the timing chain cover is removed, drive out the old oil seal.
     
    Idler sprocket and the lower timing chain
     
    Oil pump drive spacer and the crankshaft sprocket
     
    Timing chain guide
     

  8.  

To install:

  1. Drive a new oil seal into the front cover. Lubricate the oil seal lip with clean engine oil.
  2.  
  3. Confirm that No. 1 piston is set at Top Dead Center (TDC) on compression stroke.
  4.  
  5. Install or connect the following:
    NOTE
    The number of links between the alignment marks are the same for the left and the right side.



    Crankshaft sprocket with the marks of the sprocket facing the front of the engine
     
    Oil pump drive spacer and the chain guide
     
    Lower timing chain. Set the chain by aligning its mating mark with the one on the crankshaft sprocket. Be sure the sprocket's mating mark faces the front of the engine.

    Click image to see an enlarged view

    Fig. Be sure to align the camshaft sprockets with the timing chain-1.6L and 1.8L engines

     



    Crankshaft sprocket and the lower timing chain. Set the timing chain by aligning its mating mark with the one on the crankshaft sprocket. Be sure sprocket's mating mark faces engine front.
     
    Front cover assembly, using liquid gasket
     
    Engine front mounting bracket and the engine mount
     
    Oil strainer, oil pan assembly and the crankshaft pulley
     
    Center crossmember
     

  6.  
  7. Set the idler sprocket by aligning the mating mark on the larger sprocket with the silver mating mark on the lower timing chain.

    Upper timing chain and set it by aligning the mating mark on the smaller sprocket with the silver mating marks on the upper timing chain. Be sure sprocket marks face engine front.
     
    Idler sprocket shaft to the rear side
     
    Cylinder head assembly
     
    Idler sprocket bolt. Be sure to lubricate the bolt with clean engine oil.
     
    Exhaust and intake camshafts. The camshafts and marked I for intake and E for exhaust.
     

  8.  
  9. Position the intake camshaft knock pin at the 9 o'clock position and the exhaust camshaft knock pin at the 12 o'clock position.

    Click image to see an enlarged view

    Fig. Positioning of camshaft knock pins during assembly-1.6L and 1.8L engines

  10.  
  11. Install or connect the following:

    Camshaft bearing caps and distributor bracket. Apply liquid sealant to the distributor bracket.
     

  12.  
  13. Torque the mounting bolts in sequence as follows:
    1. Bolts 11-15, then bolts 1-10: 18 inch lbs. (2.0 Nm).
    2.  
    3. Bolts 1-15: 52 inch lbs. (6 Nm).
    4.  
    5. Bolts 1-14: 104 inch lbs. (12 Nm).
    6.  
    7. Bolt 15: 73 inch lbs. (8 Nm).
    8.  

  14.  
  15. Install or connect the following:

    Camshaft sprockets with timing chain. Set the camshaft sprockets by aligning the mating marks of the timing chain with the marks on the camshaft sprockets.
     
    Camshaft sprocket bolts. Torque the bolts to 86 ft. lbs. (117 Nm). Be sure to lubricate the bolts with clean engine oil.
     
    Upper timing chain tensioner. Before installation of the tensioner, install a suitable pin to hold the tensioner in the relaxed position. After installing the chain tensioner, remove the pin.
     
    Lower timing chain tensioner. Be sure the notch of the gasket is positioned down.
     
    Thermostat housing
     
    Water pump pulley
     
    Cylinder head front cover
     
    Distributor
     
    Intake manifold support
     
    Spark plugs and leads
     
    Distributor cap
     
    Rocker cover
     
    Cylinder head cover
     
    Front exhaust pipe
     
    Engine under covers
     
    Engine side covers and the right front wheel
     
    Air duct to the intake manifold collector
     
    Power steering pulley and oil pump
     
    Drive belts
     
    Upper radiator hose
     
    Negative battery cable
     

  16.  
  17. Fill the cooling system.
  18.  
  19. Start the vehicle, check for leaks and repair if necessary.
  20.  

2.0L Engine

Specific to:

Nissan Sentra 1997-2001

  1. Before servicing the vehicle, refer to the Precautions section.
  2.  
  3. Relieve the fuel system pressure.
  4.  
  5. Drain the cooling system.
  6.  
  7. Remove or disconnect the following:

    Negative battery cable
     
    Radiator
     
    Right front wheel and engine side cover
     
    Spark plugs and rotate the engine and position the No. 1 cylinder to Top Dead Center (TDC)
     
    Air duct to the intake manifold
     
    Drive belts and the water pump pulley

    Click image to see an enlarged view

    Fig. Timing chain tensioner-2.0L engines

     
    Alternator and the power steering pump from the engine
     
    Vacuum hoses, fuel hoses and the wiring harness connectors
     
    Cylinder head cover
     
    Intake manifold supports
     
    Oil filter bracket and the power steering pump bracket
     
    Timing chain tensioner
     
    Distributor
     
    Timing chain guide and holding the flats of the camshaft sprockets, remove the bolts that secure the sprockets
     
    Timing chain sprockets from the camshafts
     
    Oil tubes, baffle plate and camshaft brackets
     
    Camshafts from the cylinder head
     
    Starter motor
     
    Coolant hoses from the engine block
     
    Knock sensor (KS) harness connector
     
    Exhaust Gas Recirculation (EGR) tube
     
    Cylinder head
     
    Oil pan, oil strainer and the baffle plate
     
    Crankshaft pulley using a suitable puller
     
    Engine front mount
     
    Front cover and oil pump drive spacer
     
    Timing chain guides and timing chain. Check the timing chain for excessive wear at the roller links.
     

  8.  

To install:

  1. Clean all gasket mating surfaces.
  2.  
  3. Install or connect the following:

    Crankshaft sprocket. Position the crankshaft so that No. 1 piston is set at TDC (keyway at 12 o'clock, mating mark at 4 o'clock) fit timing chain to crankshaft sprocket so the mating mark is in line with mating mark on crankshaft sprocket. The mating marks on timing chain for the camshaft sprockets should be silver. The mating mark on the timing chain for the crankshaft sprocket should be gold.
     
    Timing chain to the crankshaft sprocket and install the timing chain guides. Tighten the timing chain guides to 10-14 ft. lbs. (13-19 Nm). Drape the timing chain over the left chain guide.

    Click image to see an enlarged view

    Fig. Timing chain sprocket alignment marks-2.0L engines

     
    Oil pump drive spacer to the crankshaft
     

  4.  
  5. Apply a continuous bead of liquid sealant to the front timing cover and install the cover. Tighten the front cover mounting bolts to 57-66 inch lbs. (6.4-7.5 Nm).
    NOTE
    When installing the camshafts, be sure to position the left-hand and right-hand camshaft keys at 12 o'clock. Also be sure the camshaft brackets are facing in the correct direction.


    NOTE
    Ensure the arrow on the outside of the tensioner faces the front of the engine.



    Right front engine mount
     
    Crankshaft pulley and torque the bolt to 105-112 ft. lbs. (142-152 Nm). Be sure the No. 1 piston is at TDC.
     
    Oil strainer, baffle plate and the oil pan assembly
     
    Cylinder head assembly. Be sure to apply a bead of sealant to the joint of the block and front timing cover.
     
    EGR tube
     
    KS harness connector
     
    Coolant hoses to the engine block, using new hose clamps
     
    Starter motor
     
    Camshafts, camshaft bearing caps, oil tubes and the baffle plate
     



    Camshaft sprockets by lining up the mating marks on the timing chain with the mating marks on the camshaft sprockets and torque the bolts to 101-116 ft. lbs. (137-157 Nm)
     
    Timing chain guide and distributor
     
    Chain tensioner. Press the cam stopper down and the press-in sleeve until the hook can be engaged on the pin. When tensioner is bolted in position the hook will release automatically.
     



    Oil filter bracket and power steering pump bracket
     
    Intake manifold supports
     
    Cylinder head cover
     
    Vacuum hoses and fuel lines
     
    Alternator and power steering pump
     
    Water pump pulley and drive belts
     
    Air duct
     
    Spark plugs after making certain that the No. 1 piston is at the TDC position
     
    Engine side cover and right front wheel
     
    Radiator
     
    Negative battery cable
     

  6.  
  7. Fill the cooling system.
  8.  
  9. Start the engine, check for leaks and repair if necessary.
  10.  

 
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