Camshaft Inspection

• If it exceeds the maximum specification, replace the camshaft.

Maximum camshaft runout 0.030 mm {0.0012 in} 

Fig 1: Measuring Camshaft Runout Using Dial Gauge

Courtesy of MAZDA MOTORS CORP.

• If it is less than the minimum specification, replace the camshaft.

Standard cam height 

IN: 42.34 mm {1.667 in} 

EX: 40.37 mm {1.589 in} 

Minimum cam height 

IN: 42.27 mm {1.664 in} 

EX: 40.30 mm {1.587 in} 

Fig 2: Measuring Cam Height Using Micrometer

Courtesy of MAZDA MOTORS CORP.

• If it is less than the minimum specification, replace the camshaft.

Standard camshaft journal diameter 24.96-24.98 mm {0.9827-0.9834 in} 

Minimum camshaft journal diameter 24.93 mm {0.9815 in} 

Fig 3: Measuring Journal Diameter Using Micrometer

Courtesy of MAZDA MOTORS CORP.

1. Clean the camshaft journal and the journal receptacle part.
2. Put the camshaft on the cylinder head with the rocker arm detached
3. Cut the plastigauge to the same length as the journal width and position it parallel to the camshaft.
4. Install the camshaft caps. (See CYLINDER HEAD ASSEMBLY (II) .)
5. Remove the camshaft caps. (See CYLINDER HEAD DISASSEMBLY (I) .)
6. Measure the camshaft journal oil clearance.
   • If it exceeds the maximum specification, replace the cylinder head.

   Standard camshaft journal oil clearance 0.035-0.080 mm {0.0014-0.0031 in} 

   Maximum camshaft journal oil clearance 0.090 mm {0.0035 in} 

   Fig 4: Measuring Camshaft Journal Oil Clearance

   Courtesy of MAZDA MOTORS CORP.

• If it exceeds the maximum specification, replace the cylinder head or camshaft.

Standard camshaft end play 0.07-0.22 mm {0.003-0.008 in} 

Maximum camshaft end play 0.98 mm {0.039 in} 

Fig 5: Measuring Camshaft End Play Using Dial Gauge

Courtesy of MAZDA MOTORS CORP.