Nissan Sentra manuals

Nissan Sentra Service Manual: Cylinder head

Exploded View


  1. Cylinder head assembly
  2. Cylinder head bolt
  3. Cylinder head gasket
  1. Refer to INSTALLATION

Removal and Installation

REMOVAL

  1. Release fuel pressure. Refer to EC-143, "Work Procedure".
  2. Drain engine coolant and engine oil. Refer to CO-12, "Changing Engine Coolant" (for Coolant) and LU-8, "Draining" (for Oil).
  3. Remove fan motor and shroud assembly. Refer to CO-17, "Component".
  4. Remove the exhaust manifold. Refer to EM-30, "Exploded View"
  5. Remove the intake manifold. Refer to EM-27, "Exploded View".
  6. Remove the fuel injector and fuel tube assembly. Refer to EM-40, "Exploded View".
  7. Remove the water outlet. Refer to CO-24, "Exploded View".
  8. Remove the rocker cover. Refer to EM-46, "Exploded View".
  9. Remove the front cover and timing chain. Refer to EM-48, "Exploded View".
  10. Remove the camshaft. Refer to EM-60, "Exploded View".
  11. Remove cylinder head.


  1. Remove cylinder head gasket.

INSTALLATION

  1. Install cylinder head gasket.

CAUTION:

Do not reuse cylinder head gasket.

  1. Install cylinder head, and tighten cylinder head bolts in order as shown using Tool (A).

CAUTION:

Tool number : KV10112100 (BT-8653-A)

Step 1 : 40.0 NВ·m (4.1 kg-m, 30 ft-lb)


Step 1 : 40.0 NВ·m (4.1 kg-m, 30 ft-lb)

Step 2 : 100В° clockwise in order

Step 3 : 0 NВ·m (0 kg-m, 0 ft-lb)

Step 4 : 40.0 NВ·m (4.1 kg-m, 30 ft-lb)

Step 5 : 100В° clockwise in order

Step 6 : 100В° clockwise in order


  1. Installation of remaining components is in the reverse order of removal.

Exploded View


  1. Valve collet
  2. Valve spring retainer
  3. Valve spring (EXH) (with valve spring seat)
  4. Valve oil seal
  5. Valve guide (EXH)
  6. Valve lifter (EXH)
  7. Valve seat (EXH)
  8. Valve (EXH)
  9. Valve (INT)
  10. Valve seat (INT)
  11. Cylinder head
  12. Valve lifter (INT)
  13. Valve guide (INT)
  14. Spark plug tube
  15. Valve spring (INT) (with valve spring seat)
  1. Refer to INSTALLATION

Disassembly and Assembly

DISASSEMBLY

  1. Remove spark plug using suitable tool.
  2. Remove valve lifter.
  1. Remove valve collet, valve spring retainer, and valve spring using Tools.

Tool number (A) : KV1016200 (J-26336-A)

Tool number (B) : KV10109220 ( — )

Tool number (C) : KV10115900 (J-26336-20)

CAUTION:


CAUTION:

Tool number : KV10115900 (J-26336-20)


  1. Remove valve spring retainer and valve spring (with valve spring seat).

CAUTION:

Do not remove valve spring seat from valve spring.

  1. Push valve stem to combustion chamber side, and remove valve.
  1. Remove valve oil seal using Tool (A).

Tool number : KV10107902 (J-38959)


  1. Remove valve seat, if necessary

CAUTION:

Do not bore excessively to prevent damage to cylinder head.

  1. Remove valve guide, if necessary.
  1. To remove valve guide, heat cylinder head to 110 to 130В°C (230 to 266В°F) by soaking in heated oil (A).

WARNING:

Cylinder head contains heat. When working, wear protective equipment to avoid getting burned.


  1. Drive out valve guide using suitable tool.

ASSEMBLY


ASSEMBLY

  1. Install valve guide, if removed.

CAUTION:

Replace with oversize [0.2 mm (0.008 in)] valve guide. Refer to EM-121, "Cylinder Head".

  1. Ream cylinder head valve guide hole using suitable tool (A).


  1. Heat cylinder head to 110 to 130В°C (230 to 266В°F) by soaking in heated oil (A).

WARNING:

Cylinder head contains heat. When working, wear protective equipment to avoid getting burned.


  1. Press valve guide (1) from camshaft side to dimension as shown.

(2) : Cylinder head

Projection (H) : Refer to EM-121, "Cylinder Head".


  1. Apply reamer finish to valve guide using suitable tool (A).

Standard : Refer to EM-121, "Cylinder Head".


  1. Install valve seat, if removed.

CAUTION:

Replace with oversize [0.5 mm (0.020 in)] valve seat. Refer to EM-121, "Cylinder Head".

  1. Ream cylinder head (1) recess diameter for service valve seat (2).


  1. Heat cylinder head to 110 to 130В°C (230 to 266В°F) by soaking in heated oil (A).

WARNING:

Cylinder head contains heat. When working, wear protective equipment to avoid getting burned.


  1. Provide valve seats cooled well with dry ice. Press-fit valve seat into cylinder head.

CAUTION:

Do not touch cold valve seats directly.

  1. Finish valve seat to the specified dimension using suitable tool.

    Refer to EM-121, "Cylinder Head".

CAUTION:

When using valve seat cutter, firmly grip the cutter handle with both hands. Then, press on the contacting surface all around the circumference to cut in a single drive. Improper pressure on the cutter or cutting many different times may result in stage valve seat.


  1. Using compound, grind to adjust valve.
  2. Check again for normal contact. Refer to EM-121, "Cylinder Head".


  1. Install valve oil seal using Tool (A).

NOTE:

Dimension is height measured before installing valve spring (with valve spring seat).

Height (H) : 15.1 - 15.7 mm (0.594 - 0.618 in)

Tool number : KV10115600 (J-38958)


  1. Install valve.
  1. Install valve spring with valve spring seat (1) (do not remove from valve spring).

Intake : White

Exhaust : Orange


  1. Install valve spring retainer.
  2. Install valve collet.

Tool number (A) : KV1016200 (J-26336-A)

Tool number (B) : KV10109220 ( — )

Tool number (C) : KV10115900 (J-26336-20)

CAUTION:


CAUTION:

When working do not damage valve lifter holes.

  1. Install valve lifter.
  1. Install spark plug. Refer to EM-12, "Exploded View".

Inspection

INSPECTION AFTER REMOVAL

Cylinder Head Bolts Outer Diameter

Limit [(d1) – (d2)]: 0.15 mm (0.0059 in)

Cylinder Head Distortion


Cylinder Head Distortion

NOTE:

When performing this inspection, cylinder block distortion should also be checked. Refer to EM-123, "Cylinder Block".

  1. Wipe off engine oil and remove water scale (like deposit), gasket, sealant, carbon, etc. with a scraper.

CAUTION:

Do not allow gasket debris to enter passages for engine oil or water.

  1. At each of several locations on bottom surface of cylinder head, measure the distortion in six directions using suitable tools (A, B).

Limit: Refer to EM-121, "Cylinder Head".

INSPECTION AFTER DISASSEMBLY


INSPECTION AFTER DISASSEMBLY

Valve Dimensions

Valve Guide Clearance

Valve Stem Diameter

Standard: Refer to EM-121, "Cylinder Head".

Valve Guide Inner Diameter


Valve Guide Inner Diameter

Standard: Refer to EM-121, "Cylinder Head".

Valve Guide Clearance

Standard and Limit: Refer to EM-121, "Cylinder Head".

Valve Seat Contact

(A) : OK

VALVE SPRING SQUARENESS


VALVE SPRING SQUARENESS

(B) : Contact

Limit : Refer to EM-121, "Cylinder Head".

VALVE SPRING DIMENSIONS AND VALVE SPRING PRESSURE LOAD


VALVE SPRING DIMENSIONS AND VALVE SPRING PRESSURE LOAD

CAUTION:

Do not remove valve spring seat from valve spring.

Standard : Refer to EM-121, "Cylinder Head".


INSPECTION AFTER INSTALLATION

NOTE:

If hydraulic pressure inside timing chain tensioner drops after removal and installation, slack in the guide may generate a pounding noise during and just after engine start. However, this is normal. Noise will stop after hydraulic pressure rises.

*: Power steering fluid, brake fluid, etc.


*: Power steering fluid, brake fluid, etc.

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