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Camshaft Inspection

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  1. Set the No.1 and No.5 journals on V-blocks.
  2. Measure the camshaft runout.
    • If it exceeds the specification, replace the camshaft.

    Maximum Runout 

    1. 0.03 mm {0.0012 in} 
      2. Fig 1: Measuring Camshaft Runout
      G02831595Courtesy of MAZDA MOTORS CORP.

  3. Measure the cam lobe height at the two points as shown in the figure.
    • If it is less than the specification, replace the camshaft.
      • Fig 2: Measuring Cam Lobe Height
      G02831596Courtesy of MAZDA MOTORS CORP.
    CAMSHAFT LOBE STANDARD HEIGHT SPECIFICATIONS

    Camshaft LF (mm {in}) L3 (mm {in})
    IN 42.12 {1.659} 42.44 {1.671}
    EX 41.08 {1.618} 41.18 {1.622}
    CAMSHAFT LOBE MINIMUM HEIGHT SPECIFICATIONS

    Camshaft LF (mm {in}) L3 (mm {in})
    IN 42.022 {1.655} 42.342 {1.667}
    EX 40.982 {1.614} 41.082 {1.618}
  4. Measure the journal diameters in X and Y directions at the two points (A and B) as indicated in the figure.
    • If it is less than the specification, replace the camshaft.

    Standard Diameter 

    1. 24.96-24.98 mm {0.9827-0.9834 in} 

    Minimum Diameter 

    1. 24.95 mm {0.982 in} 
      Fig 3: Measuring Camshaft Journal Diameters
      G02831597Courtesy of MAZDA MOTORS CORP.

  5. Remove the tappet.
  6. Position a plastigage atop the journals in the axial direction.
  7. Install the camshaft cap. (See CAMSHAFT ASSEMBLY NOTE .)
  8. Remove the camshaft cap. (See CAMSHAFT CAP DISASSEMBLY NOTE .)
  9. Measure the oil clearance.
    • If it exceeds the specification, replace the cylinder head.

    Standard Clearance 

    1. 0.035-0.080 mm {0.0014-0.0031 in} 
      Fig 4: Measuring Oil Clearance
      G02831598Courtesy of MAZDA MOTORS CORP.

    Maximum Clearance 

    1. 0.09 mm {0.0035 in} 

  10. Install the camshaft cap. (See CAMSHAFT ASSEMBLY NOTE .)
  11. Measure the camshaft end play.
    • If it exceeds the specification, replace the cylinder head or camshaft.

    Standard End Play 

    1. 0.09-0.24 mm {0.0035-0.0094 in} 

    Maximum End Play 

    1. 0.25 mm {0.0098 in} 
    Fig 5: Measuring Camshaft End Play
    G02831599Courtesy of MAZDA MOTORS CORP.
  12. Remove the camshaft cap. (See CAMSHAFT CAP DISASSEMBLY NOTE .)
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