Clutch Cover Inspection

WARNING: This page is about a different car, the 2004 Mazda RX-8. However, it is still accessible from the selected car via links, so may be relevant.

Remove the clutch cover.
Measure the wear of the diaphragm spring fingers using a vernier caliper.

Fig 1: Measuring Wear Of Diaphragm Spring Fingers Of Clutch Cover
Courtesy of MAZDA MOTORS CORP.

Maximum wear

0.6 mm {0.024 in}
- If it exceeds the maximum specification, replace the clutch cover.
Measure the pressure plate flatness using a straight edge and a feeler gauge.
NOTE:
- Measure the pressure plate flatness across the center.
Maximum flatness

0.5 mm {0.020 in}
- If it exceeds the maximum specification, replace the clutch cover.
Fig 2: Measuring Pressure Plate Flatness Across Center
Courtesy of MAZDA MOTORS CORP.
Attach a dial gauge to the rear housing, rotate the flywheel, then inspect for height difference between the diaphragm spring fingers.
Maximum height difference

1.0 mm {0.039 in}
- If it exceeds the maximum specification, replace the clutch cover.
Fig 3: Inspecting Height Difference Between Diaphragm Spring Fingers Of Clutch Cover
Courtesy of MAZDA MOTORS CORP.