Rotor Housing: Notes

Inspect rotor housing for signs of water or gas leakage. Check for wear or damage to rotor running surface or stationary gear. Check main bearings for signs of scoring or flaking.
To clean housing, wipe off sealing agent or carbon in rotor running surface with a rag and ketone or thinner. Remove rust deposits in water cooling passages.
Inspect for cracks or damage to chromium-plated surface. Check for signs of gas or water leakage. Housing must be replaced if any of these conditions exist.
Place a straightedge across sealing surface of rotor housing and check for distortion with a feeler gauge. If distortion exceeds 0.0016" (0.04 mm), replace housing. See Fig 1.

Fig 1: Measuring Rotor Housing for Distortion
Courtesy of MAZDA MOTORS CORP.

Replace if distortion exceeds limit.
Check rotor housing thickness at points A, B, C, and D in Fig 2. If micrometer readings vary between point A and minimum value for B, C, and D by more than 0.0024" (0.06 mm), replace rotor housing.
NOTE: This excessive clearance would indicate a possibility of gas or water leakage.

Fig 2: Rotor Housing Thickness Check Points
Courtesy of MAZDA MOTORS CORP.

Check thickness at A, B, C & D.