Nissan Sentra/Pulsar/NX 1982-1996 Repair Guide

Hydraulic Valve Lifters

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REMOVAL & INSTALLATION



GA16i Engine

See Figures 1, 2 and 3



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Fig. Fig. 1: Rocker arm positioning-GA16i engine



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Fig. Fig. 2: Keep the hydraulic lifters soaking under oil



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Fig. Fig. 3: Press on hydraulic lifter. It should not move more than 0.04 in. (1mm)

The hydraulic valve lifter is an integral part of the rocker arm assembly. The lifter is not serviced separately.

  1. Remove the rocker arm cover and timing chain gear as outlined in this guide.
  2.  
  3. Slowly loosen the rocker arm shaft in 3 steps. Be careful not to bend the shaft.
  4.  
  5. Label all components before disassembling the rocker shaft.
  6.  
  7. Remove the retaining bolts and spacers.
  8.  
  9. Remove the rocker arm/lifter assembly from the shaft.
  10.  
  11. If reusing the rocker arm, soak the rocker arm in a pan of oil.
  12.  

To install:
  1. Install the rocker arm/lifters onto the shaft and install the entire assembly.
  2.  
  3. Torque the rocker shaft bolts to 27 ft. lbs. (37 Nm) in 3 steps.
  4.  
  5. Install the timing chain gear and rocker arm cover.
  6.  
  7. Install the remaining components.
  8.  
  9. Start the engine and allow to run with no load at 1000 rpm for 10 minutes to bleed the air out of the lifters.
  10.  
  11. Stop engine, make sure the rocker is in its free position (not on lobe) and press down hard. It should not move more than 0.04 in. (1mm). If it moves to much repeat bleeding procedure above.
  12.  
  13. If after running engine again with no load for 10 minutes to bleed the air out of the lifters, it still moves to much the lifter or other valve components are too worn and must be replaced.
  14.  

CA16DE and CA18DE Engines

See Figures 4, 5, 6 and 7



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Fig. Fig. 4: Camshaft bearing cap torque sequence-CA16DE and CA18DE engine



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Fig. Fig. 5: Keep the lifters right side up-CA18DE engine shown



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Fig. Fig. 6: Measuring the lifters-CA18DE engine shown



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Fig. Fig. 7: Measuring the lifter bore-CA18DE engine shown

The hydraulic valve lifter is located under the camshaft lobe. Label all valve components for proper reinstallation. Mark the timing chain and sprocket locations to ensure correct valve timing.

  1. Remove the camshaft cover as outlined in this information.
  2.  
  3. Remove the timing chain sprockets and retain valve timing by hanging the sprocket with a piece of wire and wedge the chain with wood. These procedures are covered earlier in this guide.
  4.  
  5. Remove the camshaft bearing cap bolts in the opposite sequence of torquing. This is very important. Remove the camshaft.
  6.  
  7. Remove the valve lifter from the bore by turning and pulling upward.
  8.  
  9. Soak the removed lifters in a pan of clean engine oil before reassembly.
  10.  

To install:
  1. Install the valve lifter into the bore.
  2.  
  3. Install the camshaft and bearing caps.
  4.  
  5. Torque the bolts in sequence to 84-108 inch lbs. (10-12 Nm).
  6.  
  7. Install the timing chain gear and chain in the exact position as removed.
  8.  
  9. Turn the engine to make sure the camshaft is not binding.
  10.  
  11. Install the remaining components.
  12.  
  13. Start the engine and allow to run with no load for 10 minutes to bleed any air in the lifters.
  14.  

SR20DE Engine

See Figures 8, 9, 10 and 11



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Fig. Fig. 8: Check the contact surfaces of the lifter for wear or scratches-SR20DE engine



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Fig. Fig. 9: Measure the lifter and the lifter bore-SR20DE engine



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Fig. Fig. 10: Inspect the contact surfaces of the rocker arm, shim and guide for wear or scratches-SR20DE engine



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Fig. Fig. 11: The hydraulic valve lifter assembly-SR20DE engine

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

The hydraulic valve lifter is located under the rocker arm in the lifter bore. Label all valve components for exact reassembly. Mark the timing chain the gears for exact valve timing during reinstallation.

  1. Remove the camshaft cover as outlined in this guide.
  2.  
  3. Remove the timing chain tensioner. Remove the timing chain sprockets and retain valve timing by hanging the sprocket with a piece of wire and wedge the chain with wood. These procedures are covered earlier in this guide.
  4.  
  5. Remove the camshaft bearing cap bolts in the opposite sequence of torquing. Refer to the Camshaft information of this guide. This is very important. Remove the camshaft, oil tubes and baffles.
  6.  
  7. Remove the valve rocker arm, shims, guides and hydraulic lifter from the bore. Document each part for reinstallation.
  8.  
  9. Soak the removed lifters in a pan of clean engine oil during the service procedure.
  10.  

To install:
  1. Install the valve lifter into the bore. Install the guides, shims and rocker arms.
  2.  
  3. Install the camshaft, bearing caps, oil tubes and baffles.
  4.  
  5. Torque the bolts in sequence to the specification in the Camshaft portion of this guide.
  6.  
  7. Install the timing chain gear and chain in the exact position as removed.
  8.  
  9. Turn the engine to make sure the camshaft is not binding.
  10.  
  11. Install the remaining components.
  12.  
  13. Start the engine and allow to run with no load for 10 minutes to bleed any air in the lifters.
  14.  

 
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