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Home >> Nissan-Datsun >> 2003 >> Sentra Limited >> Repair and Diagnosis >> External Pages >> Different car >> Section 865 (Engine Cooling System - 3.5L) >> Water Pump >> Removal and Installation >> Removal

Removal and Installation: Removal

WARNING: This page is about a different car, the 2003 Nissan Altima. However, it is still accessible from the selected car via links, so may be relevant.
  1. Remove undercover, using power tools.
  2. Drain coolant from radiator.
    CAUTION: Perform when the engine is cold.
  3. Remove engine coolant reservoir tank. Refer to , "REMOVAL AND INSTALLATION ".
  4. Reposition IPDM/ER aside. Refer to REMOVAL AND INSTALLATION OF IPDM E/R .
  5. Remove RH wheel and tire and the splash shield.
  6. Remove drive belts.
  7. Remove idler pulley, then the power steering and generator adjusting bars.
  8. Support engine and remove the front engine insulator and bracket. Refer to REMOVAL AND INSTALLATION .
  9. Remove water drain plug on water pump side of cylinder block.
  10. Remove chain tensioner cover and water pump cover.
  11. Remove the chain tensioner assembly.
    1. Pull the lever down and release the plunger stopper tab.
      Fig 1: Applying Sealant To Water Pump Cover, Chain Tensioner Cover And Water Drain Plug
      G02160285Courtesy of NISSAN MOTOR CO., U.S.A.
    2. Insert the stopper pin into the tensioner body hole to hold the lever and keep the stopper tab released.
      NOTE: An Allen wrench [(2.5 mm (0.98 in)] is used for a stopper pin as an example.
      Fig 2: Inserting Stopper Pin Into Tensioner Body Hole
      G02160286Courtesy of NISSAN MOTOR CO., U.S.A.
    3. Insert the plunger into the tensioner body by pressing the timing chain slack guide.
    4. Keep the slack guide pressed and hold the plunger in by pushing the stopper pin deeper through the lever and into the tensioner body hole
    5. Make a gap between water pump gear and timing chain, by turning the crankshaft pulley approximately 20° clockwise.
      Fig 3: Turning Crankshaft Pulley 20° Clockwise
      G02160287Courtesy of NISSAN MOTOR CO., U.S.A.
  12. Remove chain tensioner.
    CAUTION: Be careful not to drop mounting bolts inside chain case.
    Fig 4: Removing Chain Tensioner
    G02160288Courtesy of NISSAN MOTOR CO., U.S.A.
  13. Remove the three water pump mounting bolts. Make a gap between water pump gear and timing chain, by turning crankshaft pulley counterclockwise until timing chain loosens on water pump sprocket.
    Fig 5: Removing Three Water Pump Mounting Bolts
    G02160289Courtesy of NISSAN MOTOR CO., U.S.A.
  14. Screw M8 bolts [pitch: 1.25 mm (0.49 in) length: approx. 50 mm (1.97 in)] into water pumps upper and lower mounting bolt holes until they reach the timing chain case. Then, alternately tighten each bolt for a half turn, and pull out the water pump.
    • Pull straight out while preventing vane from contacting socket in installation area.
    • Remove water pump without causing sprocket to contact timing chain.
  15. Remove M8 bolts and O-rings from water pump.
    Fig 6: Removing M8 Bolts And O-Rings From Water Pump
    G02160290Courtesy of NISSAN MOTOR CO., U.S.A.
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