Nissan Sentra/Pulsar/NX 1982-1996 Repair Guide

Camshaft and Bearings

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REMOVAL & INSTALLATION



1982-88 E-Series Engines

See Figures 1, 2 and 3

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



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Fig. Fig. 1: Camshaft sprocket alignment-E-Series engine



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Fig. Fig. 2: Camshaft positioning-E-Series engine



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Fig. Fig. 3: The punch mark on the end of the camshaft must face forward-E-Series engine

  1. Disconnect the negative (-) battery cable.
  2.  
  3. Drain the engine coolant.
  4.  


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, as outlined earlier in this section.
  2.  
  3. Remove the rocker shaft along with the rocker arms. Loosen the bolts gradually, in two or three stages.
  4.  
  5. Carefully slide the camshaft out the front of the cylinder head.
  6.  
  7. Check the camshaft run-out, end-play, wear and journal clearance. Refer to the camshaft specifications chart.
  8.  

To install:
  1. Slide the camshaft into the cylinder head carefully and then install a NEW oil seal.
  2.  
  3. Install the cylinder head and rear timing belt cover.
  4.  
  5. Set the camshaft so that the knockpin faces upward and then install the camshaft sprocket so its timing mark aligns with the one on the rear timing cover.
  6.  
  7. Install the timing belt.
  8.  
  9. Coat the rocker shaft and the interior of the rocker arm with engine oil. Install them so the punchmark on the shaft faces forward and the oil holes in the shaft face down. The cut-out in the center retainer on the shaft should face the exhaust manifold side of the engine.
  10.  
  11. Make sure the valve adjusting screws are loosened and then tighten the shaft bolts to 13-15 ft. lbs. (18-20 Nm) in several stages, from the center out. The first and last mounting bolts should have a new bolt stopper installed.
  12.  
  13. Adjust the valves and refill all fluid levels.
  14.  
  15. Start engine, check timing and road test.
  16.  

1983-87 1.7L Diesel Engine

See Figure 4



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Fig. Fig. 4: Camshaft bearing cap torque sequence-1.7L diesel engine

The camshaft is normally removed with the cylinder head removed from the engine. Follow the procedure below for timing belt removal, then follow the Cylinder Head Removal procedure earlier in this section; the camshaft removal procedure follows timing belt removal. The injection pump has its own belt drive.

  1. Support the engine with a jack and remove the right side engine mount, then jack the engine up to allow working clearance.
  2.  
  3. Set the No. 1 cylinder at TDC on its compression stroke.
  4.  
  5. Disconnect the negative (-) battery cable.
  6.  
  7. Drain the engine coolant.
  8.  


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 alternator and air conditioning compressor (if equipped) drive belts.
  2.  
  3. Using a puller, remove the crankshaft damper pulley.
  4.  
  5. Loosen the tensioner pulley and set it to the "free'' position. Remove the idler pulley.
  6.  
  7. Remove the crankshaft pulley with the timing belt. Remove the injection pump timing belt as described below.
  8.  
  9. Check the belt for damage, missing teeth, wear or saturation with oil or grease. If damage is evident or if you are in doubt as to the belt's condition, replace the belt.
  10.  

Do not bend, twist or turn the timing belt inside out. Do not allow the belt to come into contact with any grease, oil or solvents.

  1. Remove the cylinder head and manifolds.
  2.  
  3. Remove the camshaft bearing caps and check the clearance with Plastigage®. Do not turn the camshaft. If the bearing clearance exceeds 0.1mm replace the bearing caps, camshaft or cylinder head.
  4.  
  5. After checking clearances, remove the bearing caps and remove the camshaft with both oil seals. Have the camshaft run-out and lobe height checked; if worn beyond specification, replace the camshaft.
  6.  

There are two different diameter seals used on the camshaft front and rear. Be sure to use the correct seal when installing. (The front seal has an arrow on the outer edge facing clockwise; the rear seal arrow points counterclockwise). If you are replacing the oil seals without removing the camshaft, remove the pulleys and carefully pry the seals out using a small prybar or an old screwdriver covered with tape. Use care not to scratch the camshaft, cylinder head or bearing cap.

To install:
  1. To install the camshaft, first lubricate all bearing surfaces with clean engine oil. Install the camshaft bearing caps and torque, in the sequence illustrated, to 13-16 ft. lbs. (19-22 Nm). Before installing the oil seals, lubricate with clean engine oil. Reinstall the cylinder head and check valve clearances; adjust if necessary.
  2.  
  3. Install the crankshaft and camshaft timing sprockets. Torque the camshaft timing sprocket bolt to 68-75 ft. lbs. (92-102 Nm). Install the timing belt assembly in the reverse order of removal. Align the marks on the timing belt with those on the camshaft and crankshaft pulleys. When tensioning the belt, loosen the tensioner bolt and turn the crankshaft two times in its normal rotating direction, then tighten the tensioner while holding it. Do not allow the tensioner to rotate when tightening, and NEVER turn the engine against its normal rotating direction.
  4.  
  5. Install the timing belt cover as described above. Install the injection pump timing belt as described below. Install the crankshaft damper as described in that procedure.
  6.  
  7. Install the alternator and air conditioning compressor (if equipped) drive belts.
  8.  
  9. Reconnect all engine mounts and mounting brackets securely and remove the supporting jack.
  10.  
  11. Fill and bleed the cooling system.
  12.  
  13. Connect the negative (-) battery cable.
  14.  

1984-89 CA16DE and CA18DE Engines

See Figures 5, 6, 7, 8, 9, 10 and 11



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Fig. Fig. 5: Camshaft bearing cap loosening sequence-CA16DE and CA18DE engines



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Fig. Fig. 6: Explode view of the camshaft and valve train assembly-CA16DE and CA18DE engines



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Fig. Fig. 7: Camshaft bearing cap tightening sequence-CA16DE and CA18DE engines



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Fig. Fig. 8: Timing belt tensioner installation-CA16DE and CA18DE engines



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Fig. Fig. 9: Camshaft bearing cap positioning-CA16DE and CA18DE engines



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Fig. Fig. 10: Installing the camshaft in the correct position-CA16DE and CA18DE engines



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Fig. Fig. 11: The exhaust side camshaft is splined-CA16DE and CA18DE engines

Since these engines DO NOT use replaceable camshaft bearings, overhaul is performed by replacement of the camshaft or the cylinder head. Check the camshaft bearing surfaces (in the cylinder head) with an internal micrometer and the bearing surfaces (of the camshaft) with a micrometer.

  1. Remove the timing belt, as outlined earlier in this section.
  2.  
  3. Disconnect the negative (-) battery cable.
  4.  
  5. Remove the camshaft cover.
  6.  
  7. Remove the breather separator.
  8.  
  9. Drain the engine coolant.
  10.  


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.
  2.  
  3. While holding the camshaft sprockets, remove the 4 mounting bolts and then remove the sprockets themselves.
  4.  
  5. Remove the timing belt tensioner pulley. Remove the rear timing belt cover.
  6.  
  7. Loosen the camshaft bearing caps in several stages, in the order shown. Remove the bearing caps, but be sure to keep them in order.
  8.  
  9. Remove the front oil seals and then lift out the camshafts.
  10.  
  11. Check the camshaft run-out, end-play, wear and journal clearance. Refer to the camshaft specification chart.
  12.  

To install:
  1. Position the camshafts in the cylinder head so the knockpin on each is on the outboard side.
  2.  

The exhaust side camshaft has splines to accept the crank angle sensor.

  1. Position the camshaft bearing caps and finger tighten them. Each cap has an ID mark and a directional arrow stamped into its top surface.
  2.  
  3. Coat a NEW oil seal with engine oil (on the lip) and install it on each camshaft end.
  4.  
  5. Tighten the camshaft bearing cap bolts to 84-108 inch lbs. (10-14 Nm) in the sequence shown.
  6.  
  7. Install the rear timing cover.
  8.  
  9. Install the timing belt tensioner and tighten it to 16-22 ft. lbs. (21-30 Nm).
  10.  
  11. Install the camshaft sprockets and tighten the bolts to 10-14 ft. lbs. (14-20 Nm) while holding the camshaft in place.
  12.  
  13. Install the timing belt and the cylinder head.
  14.  
  15. Fill and bleed the cooling system.
  16.  
  17. Connect the negative (-) battery cable.
  18.  
  19. Start engine, check timing and road test.
  20.  

1989-90 GA16i Engine

See Figures 12, 13 and 14

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



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Fig. Fig. 12: Camshaft sprocket plate locator-GA16i engine



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Fig. Fig. 13: Rocker arm identification and positioning-GA16i engine



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Fig. Fig. 14: Rocker arm bolts and retainer positioning-GA16i engine

  1. Disconnect the negative (-) battery cable.
  2.  
  3. Drain the engine coolant.
  4.  


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 timing chain.
  2.  
  3. Remove the cylinder head with manifolds attached, as outline earlier in this section.
  4.  
  5. Remove the intake and exhaust manifolds from the cylinder head. Loosen the bolts in 2-3 stages in the proper sequence.
  6.  
  7. Loosen the rocker arm shaft bolts in 2-3 stages and lift the rocker arm/shaft assembly from the cylinder head. The rocker arm shaft is marked with an F to indicate that it faces towards the front of the engine. Place a similar mark on the cylinder head for your own reference.
  8.  
  9. Loosen the thrust plate retaining bolt.
  10.  
  11. Withdraw the camshaft and the thrust plate from the front of the cylinder head. The thrust plate is located to the camshaft with a key. Retain this key.
  12.  

To install:
  1. Clean all cylinder head, intake and exhaust manifold gasket surfaces. Lubricate the camshaft and rocker arm/shaft assemblies with a liberal coating of clean engine oil. Then, slide the camshaft and thrust plate into the front of the cylinder head. Don't forget to install the thrust plate key.
  2.  
  3. Install the rocker shafts and rocker arms making sure the F on the rocker shaft points toward the front of the engine. Install the rocker shaft retaining bolts, spring clips and washers. The center spring clip has a recess cut into one side. When installing the center clip point this recess toward the intake manifold side of the head. Snug the bolts gradually in 2-3 stages starting from the center and working out. Attach the intake and exhaust manifold to the head with new gaskets.
  4.  
  5. Install the cylinder head and timing chain.
  6.  
  7. After the timing chain is in place, set the No. 1 cylinder to TDC of the compression stroke.
  8.  
  9. Torque the No. 1 and No. 2 rocker shaft bolts to 27-30 ft. lbs. (37-41 Nm). Then, set the No. 4 cylinder to TDC and torque the No. 3 and No. 4 rocker shaft bolts to 27-30 ft. lbs. (37-41 Nm).
  10.  
  11. Fill and bleed the cooling system.
  12.  
  13. Connect the negative (-) battery cable.
  14.  

1991-93 SR20DE Engine

See Figures 15, 16, 17, 18 and 19



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Fig. Fig. 15: Camshaft assembly bolt loosening sequence-SR20DE engine



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Fig. Fig. 16: Camshaft bearing cap positioning-SR20DE engine



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Fig. Fig. 17: Camshaft bearing cap tightening sequence-SR20DE engine



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Fig. Fig. 18: Camshaft bolt identification-SR20DE engine



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Fig. Fig. 19: Rocker cover tightening sequence-SR20DE engine

  1. Disconnect the negative (-) battery cable.
  2.  
  3. Remove the rocker cover and oil separator.
  4.  
  5. Rotate the crankshaft until the No. 1 piston is at TDC on the compression stroke. Then rotate the crankshaft until the mating marks on the camshaft sprockets line up with the mating marks on the timing chain.
  6.  
  7. Remove the timing chain tensioner.
  8.  
  9. Remove the distributor.
  10.  
  11. Remove the timing chain guide.
  12.  
  13. Remove the camshaft sprockets. Use a wrench to hold the camshaft while loosening the sprocket bolt.
  14.  
  15. Loosen the camshaft bracket bolts in the opposite order of the torquing sequence.
  16.  
  17. Remove the camshaft.
  18.  

To install:
  1. Clean the left hand camshaft end bracket and coat the mating surface with liquid gasket. Install the camshafts, camshaft brackets, oil tubes and baffle plate. Ensure the left camshaft key is at 12 o'clock and the right camshaft key is at 10 o'clock.
  2.  
  3. The procedure for tightening camshaft bolts must be followed exactly to prevent camshaft damage. Tighten bolts as follows:
    1. Tighten right camshaft bolts 9 and 10 (in that order) to 18 inch lbs. (2 Nm), then tighten bolts 1-8 (in that order) to the same specification.
    2.  
    3. Tighten left camshaft bolts 11 and 12 (in that order) to 18 inch lbs. (2 Nm), then tighten bolts 1-10 (in that order) to the same specification.
    4.  
    5. Tighten all bolts in sequence to 54 inch lbs. (6 Nm).
    6.  
    7. Tighten all bolts in sequence to 78-102 inch lbs. (9-12 Nm) for type A, B and C bolts, and 13-19 ft. lbs. (18-25 Nm) for type D bolts.
    8.  

  4.  
  5. Line up the mating marks on the timing chain and camshaft sprockets and install the sprockets. Tighten sprocket bolts to 101-116 ft. lbs. (137-157 Nm).
  6.  
  7. Install the timing chain guide, distributor (ensure that rotor head is at 5 o'clock position) and chain tensioner.
  8.  
  9. Clean the rocker cover and mating surfaces and apply a continuous bead of liquid gasket to the mating surface.
  10.  
  11. Install the rocker cover and oil separator. Tighten the rocker cover bolts as follows:
    1. Tighten nuts 1, 10, 11, and 8 in that order to 36 inch lbs. (4 Nm).
    2.  
    3. Tighten nuts 1-13 as indicated in the figure to 72-84 inch lbs. (8-10 Nm).
    4.  

  12.  
  13. Connect the negative (-) battery cable. Refill all fluid levels. Road test the vehicle for proper operation.
  14.  

1990-96 GA16DE Engine

See Figures 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, and 31



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Fig. Fig. 20: Removing the timing chain guide



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Fig. Fig. 21: Before removing the camshaft the timing chain assembly must be removed



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Fig. Fig. 22: Loosen all camshaft cap bolts in small steps following the proper sequence



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Fig. Fig. 23: The front camshaft cap secures both camshafts



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Fig. Fig. 24: After all of the caps are loose, you can remove the front camshaft cap from both camshafts



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Fig. Fig. 25: Mark each bearing cap for location and direction. The caps must return to the same location



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Fig. Fig. 26: Shims are used to adjust valve clearance on the GA16DE engine



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Fig. Fig. 27: The lifters are directly below the camshaft lobes on the GA16DE engine



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Fig. Fig. 28: Timing chain alignment-GA16DE engine



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Fig. Fig. 29: Proper camshaft alignment-GA16DE engine



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Fig. Fig. 30: Camshaft identification markings-GA16DE engine



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Fig. Fig. 31: Camshaft bearing cap identification and tightening sequence-GA16DE engine

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

Modify the service steps as necessary. This is a complete disassembly repair procedure. Review the complete procedure before starting this repair.

  1. Relieve the fuel system pressure, as outlined in Fuel System .
  2.  
  3. Disconnect the negative (-) battery.
  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 all drive belts. Disconnect the exhaust tube from the exhaust manifold.
  2.  
  3. Remove the power steering bracket.
  4.  
  5. Remove the air duct to intake manifold collector.
  6.  
  7. Remove the front right side wheel, splash cover and front under covers.
  8.  
  9. Remove the front exhaust pipe and engine front mounting bracket.
  10.  
  11. Remove the rocker arm cover.
  12.  
  13. Remove the distributor cap. Remove the spark plugs.
  14.  
  15. Set the No. 1 cylinder at TDC of the compression stroke.
  16.  
  17. Mark and remove the distributor assembly.
  18.  
  19. Remove the cam sprocket cover and gusset. Remove the water pump pulley. Remove the thermostat housing.
  20.  
  21. Remove the chain tensioner, chain guide. Loosen idler sprocket bolt.
  22.  
  23. Remove the camshaft sprocket bolts, camshaft sprockets, camshaft brackets and camshafts. These parts should be reassembled in their original position. Bolts should be loosen in 2 or 3 steps (loosen bolts in the reverse of the tightening order).
  24.  

To install:
  1. Install camshafts. Make sure that the camshafts are installed in the correct position. Note the identification marks present on the camshafts: I for intake camshaft and E for exhaust camshaft.
  2.  
  3. Install camshafts brackets. Tighten camshafts brackets bolts in two or three steps to 84-108 inch lbs. (9-12 Nm) in the correct sequence. After completing assembly check valve clearance.
  4.  
  5. Assemble camshaft sprocket with chain. Set timing chain by aligning mating marks with those of camshaft sprockets. Make sure sprockets mating marks face engine front.
  6.  
  7. Install camshaft sprocket bolts. Install upper chain tensioner and chain guide.
  8.  
  9. Install lower chain tensioner (make sure that the gasket is installed properly). Check that no problems occur when engine is rotated. Make sure that No. 1 piston is set to TDC on compression stroke.
  10.  
  11. Install thermostat housing, water pump pulley. Install the distributor assembly.
  12.  
  13. Install cam sprocket cover and rocker cover.
  14.  
  15. Install all remaining components in reverse order of removal.
  16.  
  17. Connect the negative (-) battery cable. Refill all fluid levels. Road test the vehicle for proper operation.
  18.  

INSPECTION



Since these engines DO NOT use replaceable camshaft bearings, overhaul is performed by replacement of the camshaft or the cylinder head. Check the camshaft bearing surfaces (in the cylinder head) with an internal micrometer and the bearing surfaces (of the camshaft) with a micrometer.

E-series Engine

See Figures 32, 33, 34 and 35



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Fig. Fig. 32: Camshaft end-play and oil clearance inspection-E-Series engine



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Fig. Fig. 33: Use care when removing the camshaft from the cylinder head-E-Series engine



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Fig. Fig. 34: Front camshaft retaining screws-E-Series engine



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Fig. Fig. 35: Checking camshaft bearing journal clearance

  1. Remove the cylinder head from the vehicle as outlined this section.
  2.  
  3. Remove the camshaft sprocket and front cover assembly.
  4.  
  5. Remove the rocker arm assembly as outlined in this section.
  6.  
  7. Remove the camshaft, being careful not to damage the bearing journals.
  8.  
  9. Using an inside telescope gauge, measure the inside diameter of the camshaft bearing. The measurement should be 1.6535-1.6545 in. (42.000-42.025mm).
  10.  
  11. Measure the camshaft bearing journals with a micrometer. The measurement should be 1.6515-1.6522 in. (41.949-41.965mm) for journals 1, 3 and 5. The measurement should be 1.6498-1.6505 in. (41.906-41.922mm) for journals 2 and 4.
  12.  
  13. The maximum oil clearance for 1, 3 and 5 should be 0.0059 (0.15mm) and 0.0079 in. (0.20mm) for 2 and 4.
  14.  
  15. If not within specifications, replace the camshaft and/or cylinder head.
  16.  

CD17 (Diesel) Engine

See Figure 36



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Fig. Fig. 36: Camshaft shaft bearing oil clearance inspection-1.7L diesel engine

  1. Remove the camshaft as outlined in this section.
  2.  
  3. Clean all oil and dirt from the camshaft journal and bearing surface.
  4.  
  5. Place a piece of Plastigage® on the journal and install the bearing caps.
  6.  
  7. Torque the bearing cap to 13-16 ft. lbs. (18-22 Nm). Do not turn the camshaft.
  8.  
  9. Remove the bearing caps and measure the width of the Plastigage® at its widest point.
  10.  
  11. The oil clearance should be 0.0008-0.0040 in. (0.02-0.10mm).
  12.  
  13. If the clearance is not within specifications, replace the camshaft and/or cylinder head.
  14.  

GA16i Engine

See Figure 37

  1. Remove the cylinder head from the vehicle as outlined this section.
  2.  
  3. Remove the camshaft sprocket and front cover assembly.
  4.  
  5. Remove the rocker arm assembly as outlined in this section.
  6.  
  7. Remove the camshaft, being careful not to damage the bearing journals.
  8.  
  9. Using an inside telescope gauge, measure the inside diameter of the camshaft bearing. The measurement should be 1.6535-1.6545 in. (42.000-42.025mm).
  10.  
  11. Measure the camshaft bearing journals with a micrometer. The measurement should be 1.6510-1.6518 in. (41.935-41.955mm).
  12.  
  13. The maximum oil clearance is 0.0059 (0.15mm).
  14.  
  15. If not within specifications, replace the camshaft and/or cylinder head.
  16.  

CA16DE, CA18DE, GA16DE and SR20DE Engines

See Figures 37 and 38



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Fig. Fig. 37: Camshaft bearing oil clearance inspection-CA16DE, CA18DE and GA16i engines



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Fig. Fig. 38: Checking camshaft end-play. End-play should not exceed 0.0079 in.-GA16DE and SR20DE engines shown

  1. Remove the cylinder head from the vehicle as outlined this section.
  2.  
  3. Remove the camshaft, being careful not to damage the bearing journals. Install the camshaft bearing caps and torque to 7-9 ft. lbs. (10-12 Nm).
  4.  
  5. Using an inside telescope gauge, measure the inside diameter of the camshaft bearing. The measurement should be as follows:

    CA18DE- 1.1024-1.1033 in. (28.000-28.025mm)
     
    CA16DE- 1.1024-1.1033 in. (28.000-28.025mm)
     
    GA16DE No. 1 journal 1.1024-1.1032 in. (28.000-28.021mm)
     
    GA16DE No. 2-5- 0.9449-09.457 in. (24.000-24.021mm)
     
    SR20DE- 1.1024-1.1033 in. (28.000-28.025mm)
     

  6.  
  7. Measure the camshaft bearing journals with a micrometer. The measurement should be as follows:

    CA18DE- 1.0998-1.1006 in. (27.935-27.955mm)
     
    CA16DE- 1.0998-1.1006 in. (27.935-27.955mm)
     
    GA16DE No. 1 journal- 1.0998-1.1006 in. (27.935-27.955mm)
     
    GA16DE No. 2-5- 0.9423-0.9431 in. (23.935-23.955mm)
     
    SR20DE- 1.0998-1.1006 in. (27.935-27.955mm)
     

  8.  
  9. The maximum oil clearance is 0.0059 (0.15mm).
  10.  
  11. If not within specifications, replace the camshaft and/or cylinder head.
  12.  

CHECKING CAMSHAFT RUN-OUT



See Figures 39 and 40



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Fig. Fig. 39: Checking camshaft run-out



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Fig. Fig. 40: Checking camshaft height

Place the camshaft on a set of V-blocks, supported by the outermost bearing surfaces. Place a dial micrometer, with its finger resting on the center bearing surface, then turn the camshaft to check the run-out; the run-out should not exceed 0.004 in. (0.010mm), if it does exceed the limit, replace the camshaft.

Check the camshaft bearing surfaces (in the engine) with an internal micrometer and the bearing surfaces (of the camshaft) with a micrometer.

 
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