Inspection After Removal

Camshaft Runout

1. Put the camshaft on a V-block supporting the No. 2 and No. 5 journals.
2. Set the dial gauge vertically on the No. 3 journal.
3. Turn camshaft in one direction by hand, and measure the camshaft runout on the dial gauge total indicator reading.

   Standard : Less than 0.04 mm (0.0016 in) 

   Fig 1: Checking Camshaft Runout

   Courtesy of NISSAN MOTOR CO., U.S.A.

Camshaft Cam Height

1. Measure the camshaft cam height.

   Standard intake cam height : 44.815 - 45.005 mm (1.7644 - 1.7718 in) 

   Standard exhaust cam height : 43.975 - 44.165 mm (1.7313 - 1.7388 in) 

   Fig 2: Measuring Camshaft Cam Height

   Courtesy of NISSAN MOTOR CO., U.S.A.
2. If wear is beyond the limit, replace the camshaft.

Camshaft Journal Clearance

Outer Diameter of Camshaft Journal 

• Measure the outer diameter of the camshaft journal.

  Standard No. 1 outer diameter : 27.935 - 27.955 mm (1.0998 - 1.1006 in) 

  Standard No. 2, 3, 4, 5, outer diameter : 23.435 - 23.455 mm (0.9226 - 0.9234 in) 

  Fig 3: Measuring Outer Diameter Of Camshaft Journal

  Courtesy of NISSAN MOTOR CO., U.S.A.

Inner Diameter of Camshaft Bracket 

• Tighten the camshaft bracket bolts to the specified torque following the tightening pattern as shown in the figure.

  Step 1 (bolts 9 - 11) : 1.96 N.m (0.2 kg-m, 17 in-lb) 

  Step 2 (bolts 1 - 8) : 1.96 N.m (0.2 kg-m, 17 in-lb) 

  Step 3 (bolts 1 - 11) : 5.88 N.m (0.6 kg-m, 52 in-lb) 

  Step 4 (bolts 1 - 11) : 10.4 N.m (1.02 kg-m, 92 in-lb) 

  Fig 4: Camshaft Bracket Bolt Tightening Sequence

  Courtesy of NISSAN MOTOR CO., U.S.A.
• Using inside micrometer, measure inner diameter of camshaft bracket.

  Standard No. 1 : 28.000 - 28.021 mm (1.1024 - 1.1032 in) 

  Standard No. 2, 3, 4, 5 : 23.500 - 23.521 mm (0.9252 - 0.9260 in) 

  Fig 5: Measuring Inner Diameter Of Camshaft Bracket

  Courtesy of NISSAN MOTOR CO., U.S.A.

Calculation of Camshaft Journal Clearance 

• (Journal clearance) = (inner diameter of camshaft bracket) - (outer diameter of camshaft journal)

  Standard : 0.045 - 0.086 mm (0.0018 - 0.0034 in) 

• When out of the specified range above, replace either or both the camshaft and the cylinder head assembly.
  NOTE: Inner diameter of the camshaft bracket is manufactured together with the cylinder head. If the camshaft bracket is out of specification, replace the whole cylinder head assembly.

Camshaft End Play

1. Install a dial gauge in the thrust direction on the front end of the camshaft. Measure the end play with the dial gauge while moving the camshaft forward and backward (in direction to axis).

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

   Fig 6: Checking Camshaft End Play

   Courtesy of NISSAN MOTOR CO., U.S.A.
2. If out of the specified range, replace with new camshaft and measure again.
3. If out of the specified range again, replace with new cylinder head assembly.

Camshaft Sprocket Runout

1. Install the camshaft in the cylinder head.
2. Install the camshaft sprocket on the camshaft.
3. Measure camshaft sprocket runout while turning the camshaft by hand.

   Runout : Less than 0.15 mm (0.0059 in) 

   Fig 7: Measuring Camshaft Sprocket Runout

   Courtesy of NISSAN MOTOR CO., U.S.A.
4. If it exceeds the specification, replace camshaft sprocket.

Valve Lifter

• Check if the surface of the valve lifter has any excessive wear or cracks, replace as necessary.
  Fig 8: Checking Valve Lifter

  Courtesy of NISSAN MOTOR CO., U.S.A.

Valve Lifter Clearance

Outer Diameter of Valve Lifter 

• Measure the outer diameter of the valve lifter.

  Valve lifter outer diameter : 33.977 - 33.987 mm (1.3377 - 1.3381 in) 

  Fig 9: Measuring Outer Diameter Of Valve Lifter

  Courtesy of NISSAN MOTOR CO., U.S.A.
• If out of the specified range, replace the valve lifter.

Valve Lifter Bore Inner Diameter 

• Using inside micrometer, measure diameter of valve lifter bore of cylinder head.

  Standard : 34.000 - 34.021 mm (1.3386 - 1.3394 in) 

  Fig 10: Measuring Diameter Of Valve Lifter Bore Of Cylinder Head

  Courtesy of NISSAN MOTOR CO., U.S.A.
• If out of the specified range, replace the cylinder head assembly.

Calculation of Valve Lifter Clearance 

• (Valve lifter clearance) = (hole diameter for valve lifter) - (outer diameter of valve lifter)

  Standard : 0.013 - 0.044 mm (0.0005 - 0.0017 in) 

• If out of specified range, replace either or both valve lifter and cylinder head assembly.