Rotor Bearing Oil Clearance Inspection

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Measure the outer diameter of the rotor journal using a micrometer.
CAUTION:
- Measure the rotor journal at a point slightly off-center since the center section is raised. Do not measure at the center because it does not contact the rotor bearing.
Fig 1: Measuring Rotor Journal
Courtesy of MAZDA MOTORS CORP.
Measure the inner diameter of the rotor bearing using a cylinder gauge.

Fig 2: Measuring Rotor Bearing Inner Diameter
Courtesy of MAZDA MOTORS CORP.
Calculate the rotor bearing oil clearance from the rotor journal outer diameter and the rotor bearing inner diameter.
Rotor Bearing Oil Clearance = (Rotor Bearing Inner Diameter) - (Rotor Journal Outer Diameter)
- If it exceeds the minimum specification, replace the rotor bearing. (See ROTOR BEARING REPLACEMENT .)
- If not within the specification, even with the rotor bearing replaced, replace the eccentric shaft.
  
  Fig 3: Identifying Rotor Bearing Oil Clearance
  Courtesy of MAZDA MOTORS CORP.
Standard Rotor Bearing Oil Clearance
1. 0.06-0.08 mm {0.0024-0.0030 in}
Maximum Rotor Bearing Oil Clearance
1. 0.1 mm {0.0039 in}