Inspection After Disassembly (Intake Side)

Drive Shaft End Play 

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

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  : Engine front

  Standard and limit

  : Refer to Camshaft .

• Measure the following parts if out of the limit.

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  : Engine front

  • Dimension "A" for drive shaft No. 1 journal

    Standard

    : Refer to Camshaft .

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

    Standard

    : Refer to Camshaft .

• If it exceeds the limit, replace 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 (INT) Runout 

1. Put V-block on precise flat table, and support No. 2 and 5 journals of drive shaft.
   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 camshaft sprocket (INT) runout with a dial indicator. (Total indicator reading)

   Limit

   : Refer to Camshaft .

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

Valve Lifter (INT) 

• 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 (INT) 

VALVE LIFTER OUTER DIAMETER 

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

  Courtesy of NISSAN NORTH AMERICA, INC.

  Standard

  : Refer to Camshaft .

VALVE LIFTER HOLE DIAMETER 

• Measure the inner diameter of valve lifter hole of cylinder head with a suitable tool.

  Courtesy of NISSAN NORTH AMERICA, INC.

  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, replace VVEL ladder assembly & cylinder head assembly.

VVEL Ladder Assembly 

DRIVE SHAFT OPERATIONAL CHECK 

• Hold the both ends of the drive shaft (A) and rotate it to check that it rotates smoothly.

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  CAUTION: Turn VVEL ladder assembly upside down to prevent the drive shaft from dropping off.

CONTROL SHAFT OPERATIONAL CHECK 

• Move control shaft (A) to the small stopper and large stopper to check that the control shaft functions smoothly.

  Courtesy of NISSAN NORTH AMERICA, INC.

  CAUTION: Turn VVEL ladder assembly upside down to prevent the drive shaft from dropping off.

  : Engine front

RINK CHECK FOR BACK-LASH (BONDING) 

• Check that the link and the shaft of drive shaft and control shaft are not fixed.

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• Check this by moving drive shaft and control shaft in the axial and rotation directions.

• If there is an unusualness related to the above three items, replace VVEL ladder assembly & cylinder head assembly.