Inspection After Disassembly

Cylinder Head Distortion 

• Use a suitable tool (A) to inspect the cylinder head (1) combustion surfaces for flatness. If the cylinder head is not within specifications, it must be replaced.

  Courtesy of NISSAN NORTH AMERICA, INC.

  Standard and Limit

  : Refer to CYLINDER HEAD .

Valve Guide Clearance 

• Measure the inside diameter (A) of the valve guides. If a valve guide is worn larger than specification or is damaged, replace the cylinder head.

  Courtesy of NISSAN NORTH AMERICA, INC.

  Standard

  : Refer to CYLINDER HEAD .

• Measure the outside diameter of the valve stem near the center.

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  NOTE: Three measurements must be performed on each valve stem. Measure from the small end of the valve, at locations (A), (B) and (C).

  (D)	: 22 mm (0.87 in)
  (E)	: 47 mm (1.85 in)
  (F)	: 72 mm (2.83 in)

  Standard and Limit

  : Refer to CYLINDER HEAD .

• If the valves are damaged or the valve stems are worn smaller than the minimum specified, the valves must be replaced.

Valve Spring 

• Measure the valve spring (1) free length.

  Courtesy of NISSAN NORTH AMERICA, INC.

  Standard

  : Refer to CYLINDER HEAD .

• Place a suitable tool (A) adjacent to the valve spring and use a suitable tool to measure the clearance at the top spring coil.

  Standard

  : Refer to CYLINDER HEAD .

Valve Spring Pressure Load 

• Compress the valve spring. If the valve spring is not within specification, replace the valve spring.

  Courtesy of NISSAN NORTH AMERICA, INC.

  Standard

  : Refer to CYLINDER HEAD .

Camshaft Journal Clearance 

• Install the camshaft caps (1) and tighten bolts (A) to the specified torque.

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  Bolts (A)

  : 11 N.m (1.1 kg-m, 8 ft-lb)

• Measure the camshaft bores (A) using a suitable tool. If the camshaft bores are out of specification, replace the cylinder head.

  Courtesy of NISSAN NORTH AMERICA, INC.

  Standard

  : Refer to CYLINDER HEAD .

Injector Protrusion 

1. Install the injectors (2) with new sealing washers (C) into the cylinder head.

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   CAUTION: Do not reuse sealing washers.
   NOTE:

   • Bank 2 shown, Bank 1 similar.
   • Make sure the spherical washer (B) is installed with the flat side mating against the bolt (A).
   • Injectors (2, 4), (6, 8), (1, 3) and (5, 7) are held down in pairs with one hold-down clamp (1) and bolt (A) between the injectors.

   Step 1	: 24 N.m (2.4 kg-m, 18 ft-lb)
   Step 2	: Tighten 90°

2. Measure the injector protusion (B) by installing suitable tool (A) on the cylinder head.

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   NOTE: Record the measurement for each injector.

   Standard

   : Refer to CYLINDER HEAD .

3. If the injector protrusion is out of specification, check the thickness of the injector sealing washer (A) using suitable tool.

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   NOTE: If the injector sealing washer is the correct thickness, make sure the injector bore is clean and free of debris. Also make sure that injector sealing washers are not stacked in the injector bore.

   Injector sealing washer thickness

   : 2.5 mm (0.10 in)

   (1)	: Injector

4. If the injector protrusion is within specification, remove the injector (2) and discard the injector sealing washer (C).

   Courtesy of NISSAN NORTH AMERICA, INC.

   CAUTION: Do not reuse the injector sealing washers.

   (1)	: Hold-down clamp
   (A)	: Bolt
   (B)	: Spherical washer

Glow Plug Protrusion 

• Use the suitable tool (A) to measure the glow plug protrusion (B).

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  NOTE: Record the glow plug protrusion for each glow plug.

  Standard

  : Refer to CYLINDER HEAD .