Inspection After Removal

Camshaft Runout

1. Put V block on precise flat work bench, and support No. 1 and No. 5 journals of the camshaft.
2. Set dial indicator vertically to No. 3 journal.
3. Turn the camshaft to one direction, and measure the camshaft runout on dial indicator (total indicator reading).

   Camshaft runout: Less than 0.02 mm (0.0008 in) 

   Fig 1: Measuring Camshaft Runout Using Dial Indicator

   Courtesy of NISSAN NORTH AMERICA, INC.
   • If measurement exceeds specification, replace the camshaft.

   Camshaft Cam Height

   • Measure the camshaft cam height.

     Standard cam height (intake): 44.865 - 45.055 mm (1.7663 - 1.7738 in) 

     Standard cam height (exhaust): 45.075 - 45.265 mm (1.7746 - 1.7821 in) 

     Cam wear limit (intake & exhaust): 0.02 mm (0.0008 in) 

     Fig 2: Checking Camshaft Cam Height Using Micrometer

     Courtesy of NISSAN NORTH AMERICA, INC.
   • If measurement is not within the specifications, replace the camshaft.

   Camshaft Journal Clearance

   Camshaft Journal Diameter 

   • Measure the diameter of the camshaft journal.

   Standard diameter: 25.950 - 25.970 mm (1.0217 - 1.0224 in) 

   Fig 3: Measuring Camshaft Journal Diameter Using Micrometer

   Courtesy of NISSAN NORTH AMERICA, INC.

   Camshaft Bracket Inner Diameter 

   • Tighten the camshaft bracket bolt to the specified torque.
   • Measure the inner diameter (A) of the camshaft bracket.

   Standard: 26.000 - 26.021 mm (1.0236 - 1.0244 in) 

   Calculation of Camshaft Journal Clearance 

   (Journal clearance) = (camshaft bracket inner diameter) - (camshaft journal diameter) 

   Standard: 0.030 - 0.071 mm (0.0012 - 0.0028 in) 

   Fig 4: Measuring Inner Diameter Of Camshaft Bracket

   Courtesy of NISSAN NORTH AMERICA, INC.
   • If measurement is not within specification, replace either or both camshaft and cylinder head.
   NOTE: The inner diameter of the camshaft bracket is manufactured together with the cylinder head. Replace the whole cylinder head as an assembly.

   Camshaft End Play

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

     Standard: 0.115 - 0.188 mm (0.0045 - 0.0074 in) 

     Fig 5: Measuring Camshaft End Play Using Dial Gauge

     Courtesy of NISSAN NORTH AMERICA, INC.
   • If measurement is out of the specified range, replace the camshaft and measure again.
   • If measurement is still out of the specified range, replace the cylinder head.
   • Measure the following parts if end play is outside the specified value.
   • Dimension "A" for camshaft No. 1 journal

     Standard: 30.500 - 30.548 mm (1.2008-1.2027 in) 

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

     Standard: 30.360 - 30.385 mm (1.1953-1.1963 in) 

   Fig 6: Identifying Camshaft No. 1 Journal Dimension A And B

   Courtesy of NISSAN NORTH AMERICA, INC.
   • If measurements are not within specification, replace the camshaft and/or cylinder head.

Camshaft Sprocket Runout

1. Install the camshaft in the cylinder head.
2. Install the camshaft sprocket to the camshaft.
3. Measure the camshaft sprocket runout.

   Runout: Less than 0.15 mm (0.0059 in) 

   Fig 7: Measuring Camshaft Sprocket Runout

   Courtesy of NISSAN NORTH AMERICA, INC.
   • If measurement exceeds the specification, replace the camshaft sprocket.

   Valve Lifter

   Check if the surface of the valve lifter has any wear or cracks.

   • If any damage is found, replace the valve lifter.
   • Select the thickness of the head so that the valve clearance is within the standard when replacing. Refer to "INSPECTION AFTER INSTALLATION ".
     Fig 8: Identifying Valve Lifter

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   Valve Lifter Clearance

   Valve Lifter Diameter 

   • Measure the diameter of the valve lifter.

   Standard: 33.977 - 33.987 mm (1.3377 - 1.3381 in) 

   Fig 9: Measuring Valve Lifter Diameter Using Micrometer

   Courtesy of NISSAN NORTH AMERICA, INC.

   Valve Lifter Hole Diameter 

   • Measure the diameter of the valve lifter hole of the cylinder head, using suitable tool.

   Standard: 34.000 - 34.016 mm (1.3386 - 1.3392 in) 

   Calculation of Valve Lifter Clearance 

   (Valve lifter clearance) = (valve lifter hole diameter) - (valve lifter diameter)

   Standard: 0.013 - 0.039 mm (0.0005 - 0.0015 in) 

   Fig 10: Measuring Valve Lifter Hole Diameter Using Inside Micrometer

   Courtesy of NISSAN NORTH AMERICA, INC.
   • If the measurement is not within specification, referring to each specification of the valve lifter diameter and hole diameter, replace either or both the valve lifter and cylinder head.