Nissan Sentra/Pulsar/NX 1982-1996 Repair Guide

Timing Chain

Print

To remove front cover the crankshaft damper or pulley must be removed, this usually requires a puller. Before proceeding review the procedures for Crankshaft Damper and Front Timing Cover. Make sure there is enough clearance to install the puller. If there is not enough clearance for the puller, you will need to remove the engine. Review engine removal steps before proceeding as necessary.


CAUTION
When draining engine coolant, keep in mind that cats and dogs are attracted to ethylene glycol antifreeze and could drink any that is left in an uncovered container or in puddles on the ground. This will prove fatal in sufficient quantity. Always drain coolant into a sealable container. Coolant should be reused unless it is contaminated or is several years old.

REMOVAL & INSTALLATION



GA16i Engine

See Figures 1, 2, 3, 4 and 5



Click image to see an enlarged view

Fig. Fig. 1: Timing chain assembly-GA16i engine



Click image to see an enlarged view

Fig. Fig. 2: Timing chain and sprocket alignment marks-GA16i engine



Click image to see an enlarged view

Fig. Fig. 3: Removing the front seal with the timing cover off of the engine-GA16i engine



Click image to see an enlarged view

Fig. Fig. 4: The front seal must be installed in the correct direction



Click image to see an enlarged view

Fig. Fig. 5: Installing the front seal with the timing cover off of the engine-GA16i engine

  1. Set the No. 1 piston at TDC of the compression stroke.
  2.  
  3. Disconnect the negative (-) battery cable.
  4.  
  5. Remove the front cover.
  6.  
  7. If necessary, define the timing marks with chalk or paint to ensure proper alignment.
  8.  
  9. Hold the camshaft sprocket stationary with a spanner wrench or similar tool and remove the camshaft sprocket bolt.
  10.  
  11. Remove the chain guides.
  12.  
  13. Remove the camshaft sprocket.
  14.  
  15. Remove the oil pump spacer.
  16.  
  17. Remove the crankshaft sprocket and timing chain.
  18.  

To install:
  1. Verify that the No. 1 piston is at TDC of the compression stroke. The crankshaft keyways should be at the 12 o'clock position.
  2.  
  3. Install the camshaft sprocket, bolt and washer. The alignment mark must face towards the front. When installing the washer, place the non-chamfered side of the washer towards the face of camshaft sprocket. Tighten the bolt just enough to hold the sprocket in place.
  4.  
  5. Install the crankshaft sprocket making sure the alignment mark is facing the front.
  6.  
  7. Install the timing chain by aligning the silver links at the 12 o'clock and 6 o'clock positions on the chain with the timing marks on the crankshaft and camshaft sprockets. The number of links between the 2 silver links are the same for the left and the right sides of the chain, so either side of the chain may be used to align the sprocket timing marks.
  8.  
  9. Torque the camshaft sprocket bolt to 72-94 ft. lbs. (98-128 Nm) once the chain is in place and aligned.
  10.  
  11. Install the chain guides and tensioner. Use a new tensioner gasket and torque the tensioner and chain guide bolts to 9-14 ft. lbs. (13-19 Nm). When installing the chain guide, move the guide in the direction that applies tension to the chain.
  12.  
  13. Install the front cover.
  14.  
  15. Connect the negative (-) battery cable. Road test the vehicle for proper operation.
  16.  

GA16DE Engine

See Figures 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, and 18



Click image to see an enlarged view

Fig. Fig. 6: Removing the chain tensioner



Click image to see an enlarged view

Fig. Fig. 7: Removing the top chain guide



Click image to see an enlarged view

Fig. Fig. 8: Removing the chain guide



Click image to see an enlarged view

Fig. Fig. 9: Mark all component positions before removing the sprockets or chains



Click image to see an enlarged view

Fig. Fig. 10: Examining the camshaft



Click image to see an enlarged view

Fig. Fig. 11: Removing the second camshaft sprocket



Click image to see an enlarged view

Fig. Fig. 12: Lift the timing chain up and slide the camshaft sprocket out



Click image to see an enlarged view

Fig. Fig. 13: Examine the tensioners and guides for any damage or wear



Click image to see an enlarged view

Fig. Fig. 14: Take great care installing and aligning the new chain



Click image to see an enlarged view

Fig. Fig. 15: Inspect the timing chain tensioner for any damage or wear



Click image to see an enlarged view

Fig. Fig. 16: Timing chain assembly-GA16DE engine



Click image to see an enlarged view

Fig. Fig. 17: Timing chain installation-GA16DE engine



Click image to see an enlarged view

Fig. Fig. 18: Camshaft timing chain marks-GA16DE engine

  1. Relieve the fuel pressure, as outlined in Fuel System .
  2.  
  3. Disconnect the negative (-) battery cable.
  4.  
  5. Drain the cooling system.
  6.  


CAUTION
When draining engine coolant, keep in mind that cats and dogs are attracted to ethylene glycol antifreeze and could drink any that is left in an uncovered container or in puddles on the ground. This will prove fatal in sufficient quantity. Always drain coolant into a sealable container. Coolant should be reused unless it is contaminated or is several years old.

  1. Remove the cylinder head assembly.
  2.  
  3. Remove the idle sprocket shaft from the rear side.
  4.  
  5. Remove the upper timing chain assembly.
  6.  
  7. Remove the center member.
  8.  
  9. Remove the oil pan assembly, oil strainer and crankshaft pulley.
  10.  
  11. Support engine and remove the engine front mounting bracket.
  12.  
  13. Remove the front cover. One retaining bolt for the front cover assembly is located on the water pump.
  14.  
  15. Remove the idler sprocket.
  16.  
  17. Remove the lower timing chain assembly, oil pump drive spacer, chain guide, crankshaft sprocket.
  18.  

To install:
  1. Confirm that No. 1 piston is set at TDC on compression stroke. Install the chain guide.
  2.  
  3. Install crankshaft sprocket and lower timing chain. Set timing chain by aligning its mating mark with the one on the crankshaft sprocket. Make sure sprocket's mating mark faces engine front. The number of links between the alignment marks are the same for the left and right side.
  4.  
  5. Install the front cover assembly.
  6.  
  7. Install engine front mounting.
  8.  
  9. Install oil strainer, oil pan assembly and crankshaft pulley.
  10.  
  11. Install center member.
  12.  
  13. Set idler sprocket by aligning the mating mark on the larger sprocket with the silver mating mark on the lower timing chain.
  14.  
  15. Install 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. Make sure sprocket marks face engine front.
  16.  
  17. Install idler sprocket shaft.
  18.  
  19. Install the cylinder head assembly.
  20.  
  21. Install all remaining components in reverse order of removal.
  22.  
  23. Connect the negative (-) battery cable. Refill all fluid levels. Road test the vehicle for proper operation.
  24.  

SR20DE Engine

See Figures 19, 20, 21, and 22



Click image to see an enlarged view

Fig. Fig. 19: Removing the crankshaft pulley-SR20DE engine



Click image to see an enlarged view

Fig. Fig. 20: Position keyway at 12 o'clock so Piston No. 1 is at TDC-SR20DE engine



Click image to see an enlarged view

Fig. Fig. 21: Mating marks on timing chain; (1) Gold, (2) Silver, (3) Silver-SR20DE engine



Click image to see an enlarged view

Fig. Fig. 22: Camshaft sprocket and timing chain alignment marks-SR20DE engine

This is a very complex procedure. Before attempting timing chain service, thoroughly review these procedures, as well as the steps required for front timing cover and camshaft service.

  1. Relieve the fuel system pressure, as outlined in Fuel System .
  2.  
  3. Disconnect the negative (-) battery cable.
  4.  
  5. Drain the cooling system.
  6.  


CAUTION
When draining engine coolant, keep in mind that cats and dogs are attracted to ethylene glycol antifreeze and could drink any that is left in an uncovered container or in puddles on the ground. This will prove fatal in sufficient quantity. Always drain coolant into a sealable container. Coolant should be reused unless it is contaminated or is several years old.

  1. Remove the radiator.
  2.  
  3. Remove the right front wheel and engine side cover.
  4.  
  5. Remove the spark plugs.
  6.  
  7. Rotate the engine and position the No. 1 cylinder to TDC.
  8.  
  9. Remove the air duct to the intake manifold.
  10.  
  11. Remove the drive belts and the water pump pulley.
  12.  
  13. Remove the alternator and the power steering pump from the engine.
  14.  
  15. Label and remove the vacuum hoses, fuel hoses, and the wire harness connectors.
  16.  
  17. Remove the rocker arm cover mounting bolts in the reverse order of installation.
  18.  
  19. Remove the intake manifold supports.
  20.  
  21. Unbolt and remove the oil filter bracket and the power steering pump bracket.
  22.  
  23. Remove the timing chain tensioner.
  24.  
  25. Matchmark the distributor rotor and the distributor housing to the engine block and remove the distributor.
  26.  
  27. Remove the timing chain guide.
  28.  
  29. Holding the flats of the camshaft sprockets, remove the bolts that secure the sprockets.
  30.  
  31. Remove the timing chain sprockets from the camshafts.
  32.  
  33. Remove the oil tubes, baffle plate, camshaft brackets and remove the camshafts from the cylinder head.
  34.  
  35. Remove the starter motor.
  36.  
  37. Remove the coolant hoses from the engine block.
  38.  
  39. Remove the knock sensor harness connector.
  40.  
  41. Remove the EGR tube.
  42.  
  43. Remove the cylinder head assembly.
  44.  
  45. Raise and support the vehicle safely.
  46.  
  47. Remove the oil pan, oil strainer, and the baffle plate.
  48.  
  49. Remove the crankshaft pulley using a suitable puller.
  50.  
  51. Remove the engine front mount.
  52.  
  53. Remove the front cover and oil pump drive spacer.
  54.  
  55. Remove the timing chain guides and timing chain. Check the timing chain for excessive wear at the roller links. Replace the chain if necessary.
  56.  

To install:
  1. Clean all gasket mating surfaces.
  2.  
  3. Install the 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.
  4.  
  5. Install the timing chain to the crankshaft sprocket and install the timing chain guides. Tighten the timing chain guides to 9-14 ft. lbs. (13-19 Nm). Drape the timing chain over the left chain guide.
  6.  
  7. Install the oil pump drive spacer to the crankshaft.
  8.  
  9. Apply a continuous bead of liquid sealant to the front timing cover and install the cover. Torque the front cover mounting bolts to 57-66 inch lbs. (6.4-7.5 Nm).
  10.  
  11. Install right front engine mount.
  12.  

When using RTV sealant instead of gaskets, make sure the surface you are working on is very clean before applying the sealant, then apply an even bead. Allow the RTV to dry slightly to form a thin skin. The component MUST be tightened before the RTV dries completely. The bolt torque should be checked again after RTV has completely dried.

  1. Install the crankshaft pulley and tighten the mounting bolt to 105-112 ft. lbs. (142-152 Nm). Be sure the No. 1 piston is at TDC.
  2.  
  3. Install the oil strainer, baffle plate, and the oil pan assembly.
  4.  
  5. Install the cylinder head assembly. Be sure to apply a bead of sealant to the joint of the block and front timing cover.
  6.  
  7. Install the EGR tube.
  8.  
  9. Install the knock sensor harness connector.
  10.  
  11. Using new hose clamps, install the coolant hoses to the engine block.
  12.  
  13. Install the starter motor.
  14.  
  15. Install the camshafts, camshaft bearing caps, oil tubes, and the baffle plate.
  16.  

When installing the camshafts, be sure to position the LH and RH camshaft keys at 12 o'clock. Also make sure the camshaft brackets are facing in the correct direction.

  1. Install the camshaft sprockets by lining up the mating marks on the timing chain with the mating marks on the camshaft sprockets. Tighten the camshaft sprocket bolts to 101-116 ft. lbs. (137-157 Nm).
  2.  
  3. Install the timing chain guide and distributor.
  4.  
  5. Install the 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.
  6.  

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

  1. Install the oil filter bracket and the power steering pump bracket.
  2.  
  3. Install the intake manifold supports.
  4.  
  5. Install a continuous bead of sealant to the rocker cover and install the cover. Torque the mounting bolts in sequence as follows:
    1. Tighten nuts No. 1, 10, 11, 13 and 8 (in that order) to 35 inch lbs. (4 Nm).
    2.  
    3. Tighten nuts No. 1 through 13 in numerical order to 70-86 inch lbs. (8-10 Nm).
    4.  

  6.  
  7. Install the remaining components. Install the vacuum hoses, fuel hoses, and the wire harness connectors. Lower the vehicle, connect the negative battery cable, Refill fluid levels, start the engine, and bleed the cooling system. Check for leaks and road test the vehicle for proper operation.
  8.  

 
label.common.footer.alt.autozoneLogo