Inspection After Disassembly (Exhaust Side)

Exhaust Camshaft Runout 

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

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   CAUTION: Do not support No. 1 journal (on the side of camshaft sprocket) because it has a different diameter from the other four locations.
2. Set a suitable tool vertically to No. 3 journal.
3. Turn exhaust camshaft to one direction with hands, and measure the camshaft runout on a suitable tool. (Total indicator reading)

   Standard and limit

   : Refer to Camshaft .

4. If it exceeds the limit, replace exhaust camshaft.

Exhaust Camshaft Cam Height 

• Measure the exhaust camshaft cam height with a suitable tool.

  Courtesy of NISSAN NORTH AMERICA, INC.

  Standard and limit

  : Refer to Camshaft .

• If wear exceeds the limit, replace exhaust camshaft.

Exhaust Camshaft Journal Oil Clearance 

EXHAUST CAMSHAFT JOURNAL DIAMETER 

• Measure the outer diameter of exhaust camshaft journal with a suitable tool (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 "INSTALLATION"
• Measure inner diameter (A) of VVEL ladder assembly (exhaust side) with a suitable tool.

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  Standard

  : Refer to Camshaft .

EXHAUST CAMSHAFT JOURNAL OIL CLEARANCE 

• (Oil clearance) = [VVEL ladder assembly (exhaust side) inner diameter] - [Exhaust camshaft journal diameter].

  Standard and limit

  : Refer to Camshaft .

• If the calculated value exceeds the limit, replace either or both exhaust camshaft 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.

Exhaust Camshaft End Play 

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

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  Standard and limit

  : Refer to Camshaft .

• Measure the following parts if out of the limit.

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  • Dimension "A" for exhaust camshaft No. 1 journal

    Standard

    : Refer to Camshaft .

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

    Standard

    : Refer to Camshaft .

• Refer to the standards above, and then replace exhaust camshaft 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.

Exhaust Camshaft Sprocket Runout 

1. Put V-block on precise flat table, and support No. 2 and 5 journals of exhaust camshaft.
   CAUTION: Do not support No. 1 journal (on the side of camshaft sprocket) because it has a different diameter from the other four locations.
2. Measure the exhaust camshaft sprocket runout with a suitable tool. (Total indicator reading)

   Courtesy of NISSAN NORTH AMERICA, INC.

   Limit

   : Refer to Camshaft .

3. If it exceeds the limit, replace exhaust camshaft sprocket.

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. Refer to Camshaft .

Valve Lifter Clearance (EXH) 

VALVE LIFTER OUTER DIAMETER 

• Measure the outer diameter at 1/2 height of valve lifter with a suitable tool (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 a suitable tool.

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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.