Inspection After Disassembly (Exhaust Side)

Camshaft (EXH) Runout 

1. Put V-block on precise flat table, and support No. 2 and 5 journals of camshaft.

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   CAUTION: Never support No. 1 journal (on the side of camshaft sprocket) because it has a different diameter from the other four locations.
2. Set a dial indicator vertically to No. 3 journal.
3. Turn camshaft (EXH) to one direction with hands, and measure the camshaft runout on a dial indicator. (Total indicator reading)

   Standard and limit

   : Refer to Camshaft .

4. If it exceeds the limit, replace camshaft (EXH).

Camshaft (EXH) Cam Height 

• Measure the camshaft (EXH) cam height with a micrometer.

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  Standard and limit

  : Refer to Camshaft .

• If wear exceeds the limit, replace camshaft (EXH).

Camshaft (EXH) Journal Oil Clearance 

CAMSHAFT (EXH) JOURNAL DIAMETER 

• Measure the outer diameter of camshaft (EXH) journal with a micrometer (A).

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  Standard

  : Refer to Camshaft .

VVEL LADDER ASSEMBLY (EXH SIDE) INNER DIAMETER 

• Tighten VVEL ladder assembly bolts to the specified torque. Refer to "ASSEMBLY" for the tightening procedure.
• Measure inner diameter (A) of VVEL ladder assembly (EXH side) with a bore gauge.

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  Standard

  : Refer to Camshaft .

CAMSHAFT (EXH) JOURNAL OIL CLEARANCE 

• (Oil clearance) = [VVEL ladder assembly (EXH side) inner diameter] - [Camshaft (EXH) journal diameter].

  Standard and limit

  : Refer to Camshaft .

• If the calculated value exceeds the limit, replace either or both camshaft (EXH) and VVEL ladder assembly & cylinder head assembly.
  NOTE: VVEL ladder assembly cannot be replaced as a single part, because it is machined together with cylinder head assembly.

Camshaft (EXH) End Play 

• Install a dial indicator in thrust direction on front end of camshaft. Measure the end play of a dial indicator when camshaft (EXH) is moved forward/backward (in direction of axis).

  Courtesy of NISSAN NORTH AMERICA, INC.

  Standard and limit

  : Refer to Camshaft .

• Measure the following parts if out of the limit.

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  • Dimension "A" for camshaft (EXH) No. 1 journal

    Standard

    : 30.500 - 30.548 mm (1.2008 - 1.2027 in)

  • Dimension "B" for cylinder head No. 1 journal bearing

    Standard

    : 30.360 - 30.385 mm (1.1953 - 1.1963 in)

• Refer to the standards above, and then replace camshaft (EXH) and/or VVEL ladder assembly & cylinder head assembly.
  NOTE: Cylinder head assembly cannot be replaced as a single part, because it is machined together with VVEL ladder assembly.

Camshaft Sprocket (EXH) Runout 

1. Put V-block on precise flat table, and support No. 2 and 5 journals of camshaft (EXH).
   CAUTION: Never support No. 1 journal (on the side of camshaft sprocket) because it has a different diameter from the other four locations.
2. Measure the camshaft sprocket (EXH) runout with a dial indicator. (Total indicator reading)

   Courtesy of NISSAN NORTH AMERICA, INC.

   Limit

   : Refer to Camshaft .

3. If it exceeds the limit, replace camshaft sprocket (EXH).

Valve Lifter (EXH) 

• Check if surface of valve lifter has any wear or crack.

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• If wear or crack is found, replace valve lifter (EXH). Refer to Camshaft .

Valve Lifter Clearance (EXH) 

VALVE LIFTER OUTER DIAMETER 

• Measure the outer diameter at 1/2 height of valve lifter with a micrometer (A) since valve lifter is in barrel shape.

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  Standard

  : Refer to Camshaft .

VALVE LIFTER HOLE DIAMETER 

• Measure the inner diameter of valve lifter hole of cylinder head with an inside micrometer.

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  Standard

  : Refer to Camshaft .

VALVE LIFTER CLEARANCE 

• (Valve lifter clearance) = (Valve lifter hole diameter) - (Valve lifter outer diameter)

  Standard

  : Refer to Camshaft .

• If the calculated value is out of the standard, referring to each standard of valve lifter outer diameter and valve lifter hole diameter, replace either or both valve lifter and VVEL ladder assembly & cylinder head assembly.
  NOTE: Cylinder head assembly cannot be replaced as a single part, because it is machined together with VVEL ladder assembly.