Sentra 2008

Camshaft & Valve Lifters

Print

Inspection



2.0L Engine

Specific to:

Nissan Sentra 2007-2012

To Measure Camshaft Runout:

  1. Put V-block on a precise flat table, and support No. 2 and 5 journal of camshaft.
    WARNING
    Never support No. 1 journal (on the side of camshaft sprocket) because it has a different diameter from the other four locations.

  2.  
  3. Set dial indicator vertically to No. 3 journal.

    Click image to see an enlarged view

    Fig. Set dial indicator (A) vertically to No. 3 journal

  4.  
  5. Turn camshaft to one direction with hands, and measure the camshaft runout on dial indicator.
  6.  
  7. If runout exceeds 0.0020 in. (0.05mm), replace camshaft.
  8.  

To Measure Cam Height:

  1. Measure the camshaft cam height with a micrometer. If it exceeds the limit, replace camshaft.
  2.  
  3. Standard value: Intake, 1.7560-1.7635 in. (44.605-44.795 mm): Exhaust, 1.6997-1.7072 in. (43.175-43.365 mm)
  4.  
  5. Limit: Intake, 1.7482 in. (44.405 mm): Exhaust, 1.6919 in. (42.975 mm)
  6.  

To Measure Oil Clearance:

  1. Measure the outer diameter of camshaft journal with a micrometer.
  2.  
  3. Install camshaft bracket and tighten bolts to specified torque in the proper sequence.
  4.  
  5. Measure inner diameter of each bearing with an inside micrometer.
  6.  
  7. Standard value: Bearing No. 1, 0.0018-0.0034 in. (0.045-0.086 mm): Remaining bearings, 0.0012-0.0028 in. (0.030-0.071 mm)
  8.  
  9. Limit: 0.0059 in (0.15 mm)
    NOTE
    If oil clearance is not correct, the cylinder head must be replaced.

  10.  

To Measure Endplay

  1. Camshaft endplay can be measured with the valve tappets removed or installed. Standard value, 0.0030-0.0060 in. (0.075-0.153 mm): Limit, 0.0094 in. (0.24 mm)
  2.  

2.5L Engine

Specific to:

Nissan Sentra 2007-2012

  1. Put the camshaft on a V-block supporting the No.2 and No.5 journals.
  2.  
  3. Set the dial gauge vertically on the No.3 bearing journal.
  4.  
  5. Turn camshaft in one direction by hand, and measure the runout on the dial gauge total indicator reading. Total camshaft runout must be no more than 0.0016 in. (0.04 mm).
  6.  
  7. Use a micrometer to measure cam lobe height. If wear is beyond the limit, replace the camshaft.

    Standard intake cam lobe height: 1.7644-1.7718 in. (44.815-45.005 mm)
     
    Standard exhaust cam lobe height: 1.7313-1.7388 in. (43.975-44.165 mm)
     

  8.  
  9. Use a micrometer to measure the camshaft bearing journal.

    Standard No.1 bearing journal diameter: 1.0998-1.1006 in. (27.935-27.955 mm)
     
    Standard No. 2, 3, 4, 5 bearing journal diameter: 0.9226-0.9234 in. (23.435-23.455 mm)
     

  10.  
  11. Install the camshaft brackets (bearing caps) and torque the bolts following the standard camshaft installation procedure. See Camshaft Removal and Installation.
  12.  
  13. Using an inside micrometer, measure the inner diameter of the camshaft bearings.

    Standard No.1 inner diameter: 1.1024-1.1032 in. (28.000-28.021 mm)
     
    Standard No. 2, 3, 4, 5 inner diameter: 0.9252-0.9260 in. (23.500-23.521 mm)
     

  14.  
  15. To calculate camshaft journal oil clearance, subtract the outer diameter of the camshaft journal (outside micrometer reading) from the inner diameter of the camshaft bearings (inside micrometer reading). The standard clearance is 0.0018-0.0034 in. (0.045-0.086 mm)
  16.  
  17. If clearance is out of the specified range, replace either or both the camshaft and the cylinder head assembly.
    NOTE
    Inner diameter of the camshaft bearings is manufactured together with the cylinder head. If the camshaft oil clearance is out of specification, replace the whole cylinder head assembly.

  18.  
  19. To measure camshaft end play:

    Install the camshafts with the valve lifters removed and torque the bearing cap bolts as specified.
     
    Set a dial gauge in the thrust direction on the front end of the camshaft.
     
    Measure the end play with the dial gauge while moving the camshaft lengthwise in the bearings.
     
    If end play exceeds 0.0045-0.0074 in. (0.115-0.188 mm), install a new camshaft and measure again. If end play is still excessive, replace the cylinder head.
     

  20.  

Removal & Installation



2.0L Engine

Specific to:

Nissan Sentra 2007-2012


CAUTION
Put a -CAUTION: FLAMMABLE- sign in the workshop.


CAUTION
Be sure to work in a well-ventilated area and keep a CO2 fire extinguisher handy. Do not smoke while servicing fuel system. Keep open flames and sparks away from the work area.

  1. Release the fuel pressure.

    Remove fuel pump fuse.
     
    Start engine.
     
    After engine stalls, crank it two or three times to release all fuel pressure.
     
    Turn ignition switch OFF.
     

  2.  
  3. Disconnect negative battery cable.
  4.  
  5. Remove right front wheel.
  6.  
  7. Remove right front splash shield.
  8.  
  9. Partially drain engine coolant.
    NOTE
    Perform this step when engine is cold.

  10.  
  11. Remove the intake manifold
  12.  
  13. Remove ignition coils, spark plugs and rocker cover.
  14.  
  15. Remove fuel tube and fuel injector assembly
    NOTE
    Valves are adjusted by replacing the lifters. Now is the time to measure and record valve clearances.



    Remove quick connector cap from quick connector connection.
     
    Disconnect fuel feed hose from hose clamp.
     
    With the sleeve side of quick connector release facing quick connector, install quick connector release tool onto fuel tube.
     
    Insert quick connector release into quick connector until sleeve contacts and goes no further. Hold quick connector release on that position. Inserting quick connector release hard will not disconnect quick connector. Hold quick connector release where it contacts and goes no further.
     
    Draw and pull out quick connector straight from fuel tube.
     

  16.  
  17. Remove the rocker cover.
  18.  
  19. Remove the timing cover, timing chain and related parts.
    WARNING
    Handle camshaft sensor carefully to avoid dropping and shocks. Never disassemble. Never allow metal powder to adhere to magnetic part at sensor tip. Never place sensor in a location where it is exposed to magnetism.



    Remove Camshaft Position (CMP) sensor from camshaft bracket.
     

  20.  
  21. Align the match marks on the intake camshaft sprocket and the camshaft bracket. This prevents the knock pin of the camshaft from engaging with the incorrect pin hole when installing the camshaft sprocket.
  22.  
  23. Hold the camshaft with a wrench and loosen camshaft sprocket bolts to remove camshaft sprocket.
    WARNING
    Never rotate crankshaft or camshaft while timing chain is removed. It causes interference between valve and piston. Never loosen the sprocket bolts without holding the camshaft securely with a wrench.

  24.  
  25. Loosen bolts in reverse of tightening order.
  26.  
  27. Cut liquid gasket by prying at the right front and left rear corners of the camshaft bracket, then remove the camshaft bracket.
    WARNING
    Be careful not to damage the mating surface. A more adhesive liquid gasket is applied compared to previous types when shipped, so it should not be forced off the position not specified.

  28.  
  29. Carefully lift out the camshafts.

    Click image to see an enlarged view

    Fig. Exploded view of the camshaft-2.0L engine



    Click image to see an enlarged view

    Fig. Hold the quick connector release tool up while pulling fuel line straight off. Don-t twist the fuel line.



    Click image to see an enlarged view

    Fig. Align match marks on intake camshaft sprocket and camshaft bracket.



    Click image to see an enlarged view

    Fig. Camshaft bolt tightening sequence

  30.  

To install:

  1. Install valve lifters in their original positions.
  2.  
  3. Install camshafts. Position the dowel pins at the sprocket end at the 12 o-clock position.
  4.  
  5. Carefully clean the camshaft bracket and apply a bead of RTV sealer around the outer edges and spark plug holes.
  6.  
  7. Fit the camshaft bracket into position and install the bolts. The long bolts go into holes 13, 14 and 15.
  8.  
  9. Tighten all bolts in numerical order in three steps. Do not over tighten the bolts.

    Step 1: 17 inch lbs. (2 Nm)
     
    Step 2: 52 inch lbs. (6 Nm)
     
    Step 3: 84 inch lbs. (9.5 Nm)
     

  10.  
  11. Install the intake camshaft sprocket, making sure to align the match marks. Hold the camshaft with a wrench and tighten the bolt to 26 ft. lbs. (35 Nm) plus 67°.
    WARNING
    Use an angle-measuring wrench.

  12.  
  13. Install the exhaust camshaft sprocket, hold the camshaft with a wrench and torque the bolt to 65 ft. lbs. (88 Nm).
  14.  
  15. Install timing chain and related parts.
  16.  
  17. Inspect and adjust valve clearance.
  18.  
  19. Installation of the remaining components is in the reverse order of removal.
  20.  

2.5L Engine

Specific to:

Nissan Sentra 2007-2012


CAUTION
Be sure to work in a well-ventilated area and keep a CO2 fire extinguisher handy. Do not smoke while servicing fuel system. Keep open flames and sparks away from the work area.

  1. Disconnect the negative battery cable.
  2.  
  3. Support the engine using a suitable hoist or jack.
  4.  
  5. Remove the right engine mount and brackets.
  6.  
  7. Remove the rocker cover.
  8.  
  9. Remove the power steering reservoir.
  10.  
  11. Remove the coolant overflow reservoir.
  12.  
  13. Disconnect variable timing control solenoid.
  14.  
  15. Loosen the camshaft timing control cover bolts in reverse order of the tightening sequence.
  16.  
  17. Set the No.1 cylinder at TDC on its compression stroke with the following procedure:

    Open the splash cover under the engine.
     
    Rotate crankshaft pulley clockwise to align timing mark for TDC with timing indicator on front cover.
     
    Make sure the mating marks on camshaft sprockets are lined up with the yellow links in the timing chain as shown. If not, rotate crankshaft pulley one more turn to line up the mating marks to the yellow links.
     

  18.  
  19. Pull the timing chain guide out between the camshaft sprockets through front cover.
  20.  
  21. Remove camshaft sprockets with the following procedure.
    WARNING
    Do not rotate the crankshaft or camshaft while the timing chain is removed. This is an interference engine.


    NOTE
    Chain tension holding work is not necessary. Crankshaft sprocket and timing chain do not disconnect while front cover is attached.

  22.  

Note the following:



Make sure marks on camshaft sprockets are aligned with the yellow links in the timing chain
 
Paint an indelible mating mark on the sprocket and timing chain link plate.
 
Push in the chain tensioner plunger and insert a 0.020 in. (0.5 mm) pin into the hole on tensioner body to hold the chain tensioner.
 
Remove the timing chain tensioner.
 

  1. Hold the hexagonal part of camshaft with a wrench and loosen the camshaft sprocket mounting bolts to remove the camshaft sprockets.
  2.  
  3. Loosen the camshaft bearing cap bolts in reverse of the order and remove the caps. A rubber mallet may be needed.
  4.  
  5. Remove the camshafts.
  6.  
  7. When removing the valve lifters, keep them in order so they can be installed in the same locations.

    Click image to see an enlarged view

    Fig. Exploded view of the camshaft-2.5L engine



    Click image to see an enlarged view

    Fig. Valve timing control cover bolt tightening sequence-2.5L engine



    Click image to see an enlarged view

    Fig. Align cam timing marks to find TDC



    Click image to see an enlarged view

    Fig. Push the chain tensioner plunger in and insert a pin to keep it retracted



    Click image to see an enlarged view

    Fig. Camshaft bearing cap bolt tightening order-2.5L engine



    Click image to see an enlarged view

    Fig. Make sure camshaft dowel pins are positioned as shown.

  8.  

To install:

  1. Install the valve lifters.
  2.  
  3. Lubricate and carefully fit the camshafts into place. The back of the intake camshaft has the signal plate for the Camshaft Position (CMP) sensor. Make sure the dowel pins on the front side are positioned as shown.
  4.  
  5. Install the camshaft bearing caps so the numbers or letters can be read from the exhaust side of the cylinder head. Caps 2, 3, 4 and 5 go on the intake camshaft, front to rear of engine. Caps A, B, C and D are front-to-rear exhaust camshaft caps. Make the bolts only finger tight at this time.
  6.  
  7. Make sure all sealing surfaces are clean and apply RTV sealant to the bracket where it contacts the cylinder head and the front cover. The sealant bead should be outside the bolt holes.
  8.  
  9. Position the camshaft bracket near the mounting position and install it without disturbing the sealant.
  10.  
  11. Tighten all camshaft bracket and bearing cap bolts in four steps in the order shown.

    Step 1, bolts 9-11: 17 inch lbs. (2 Nm)
     
    Step 2, bolts 1-8: 17 inch lbs. (2 Nm)
     
    Step 3, bolts 1-11 52 inch lbs. (6 Nm)
     
    Step 4, bolts 1-11: 92 inch lbs. (10 Nm)
     

  12.  
  13. Wipe off any excess sealant.
  14.  
  15. Install camshaft sprockets, making sure to line up the mating marks on each camshaft sprocket with the ones painted on the timing chain during removal.
    NOTE
    Before installation of chain tensioner, it is possible to re-match the marks on timing chain with the ones on each sprocket.

  16.  
  17. Install chain tensioner and check again to make sure that mating marks have not slipped.
  18.  
  19. Remove the stopper pin from the tensioner and check the timing marks again.
  20.  
  21. Install chain guide.
  22.  
  23. Install camshaft timing control cover with the following procedure.

    Install control solenoid valve to intake valve timing control cover.
     
    Install new O-ring to front cover side.
     

  24.  
  25. Apply RTV sealant to the cover. The bead should be inside the bolt holes.

    Install the control cover and tighten the bolts in numerical order to 9 ft. lbs. (12 Nm).
     

  26.  
  27. Check and adjust valve clearances.
  28.  
  29. Installation of the remaining components is in the reverse order.
  30.  

 
label.common.footer.alt.autozoneLogo