3. Rotor:

3.A Clearance related to Rotor (delta-R) .

1. Measuring tools required:  Micrometer (50 - 75 mm) or (75 - 100 mm).

2. Measurement of delta-R. delta-R = Rotor Housing width (A) on A point - Maximum Rotor width (R).

delta-R should be more than 0.1 mm (0.004 in). If delta-R is less than 0.1 mm, hold the rotor by hand or place it on a table with rubber pad, and strike the internal gear lightly with a plastic hammer, being careful not to damage the gear. This is to ensure the gear is seated correctly on its dowels.

3.B Wear on the land of Rotor (delta-H).

1. Measuring tools required:  a. Straight Edge (30cm)         b. Feeler Gauge (0.08 mm)

2. Measurement of delta-H.

delta H should be more than 0.08 mm (0.003 in). If delta H is less than 0.08 mm, Replace the Rotor. 

3.C Gap between Apex Seal and Apex Seal groove (delta-G).

1. Measuring tools required:  Feeler Gauge (0.10 mm, 0.15 mm)

2. Measurement of delta-G.

 

Carbon Seal       

Replace the Rotor if

delta-G is more than 0.1 mm (0.004 in)

Even if measured with new Apex Seal.       

 

Metallic Seal

Replace the Rotor if 

delta-G is more than 0.15 mm (0.006 in)

Even if measured with new Apex Seal.

 

Re-use the used Apex Seal if delta-G is within the limitation when measured with used Apex Seal, provided there is no other damage to the Apex Seal.        Re-use the used Apex Seal if delta-G is within the limitation when measured with used Apex Seal, provided there is no other damage to the Apex Seal.

 

Re-use the used Apex Seal if delta-G is within the limitation when measured with used Apex Seal, provided there is no other damage to the Apex Seal.

Rarely upper portion of Apex Seal groove is abnormally widened around the Corner Seal groove. In this case, measure the clearance by feeler gauge upon removing corner seal and installing new apex seal as shown below:

If more than 0.2 mm (0.008 in), Replace the Rotor.  **Note: Check the Air Cleaner Element because there is the possibility that a great amount of dust has been entering the Engine.

 

4. Carbon Apex Seal:

4.A Measurement.

4.A.a Height of Apex Seal (Y).

1. Measuring tools required:  Micrometer (0 - 25 mm).

2. Measurement of Y1, Y2.

Replace if Y1 or Y2 is less than 8 mm (0.31 in).

Apex Seals are individually replaceable.

4.A.b Clearance between Apex Seal and Rotor Housing (delta S) .

1. Measuring tools required:  Micrometer (50 - 75 mm) or (75 - 100 mm).

2. Measurement of delta S. delta S = Rotor Housing width A on (A) point - Apex Seal Length (L).

 

Note: In previous information, such as the criteria book and workshop manual up to 1975 models, the minimum Rotor Housing width (B, C, or D) has been used as the Rotor Housing width for this measurement (delta S, delta R).

The measuring point has been changed as shown in this manual (A point) from September 1975.

This change is also applicable for all Mazda Rotary Engine including previous models.

The Specification, however, has not been changed by this change in measuring location.

3. Adjusting delta-S

 

Adjust the delta-S by grinding the Apex Seal end if delta-S is less than the lower limit of the standard delta-S in the criteria.

4.B Apex Seal Inspection.

4.B.a Top of Apex Seal chipped or damaged.

Replace if D is more than 1.0 mm (0.040 in).

4.B.b End of Apex Seal chipped or damaged.

Replace if A is more than 1.0 mm (0.040 in).

4.B.c Vertical grooves on top of Apex Seal.

Re-use unless the height of the Apex Seal is less than 8.0 mm (0.31 in).

5. Metal Apex Seal.

Note: When replacing the two piece type apex seal, replace them as a set (main piece and side piece).

5.A Dimension.

5.A.a Height of Apex Seal (Y).

1. Measuring tools required:  Micrometer (0 - 25 mm).

2. Measurement of Y.

Replace if Y is less than 7.0 mm (0.28 in).

Note: Apex Seals are individually Replaceable.

5.A.b Protrusion of Apex Seal End.

1. Measuring tools required:  a. Visual Inspection      b. Feeler Gauge (0.03 mm).

2. Measurement of Protrusion.

 

 

1. Visual Inspection:

2. Measurement by using Feeler Gauge.

Incline Apex Seal slightly to measure it, because protrusion is more evident on the side rather than the top.

When the Rotor Housing is Re-used, reuse the Apex Seal if the clearance is less than 0.03 mm.

When the Rotor Housing is replaced, replace the Apex Seal if any protrusion is found.

5.A.c Apex Seal Distortion (delta-D).

1. Measuring tools required:  Feeler Gauge (0.06 mm).

2. Measurement of delta-D.

Measure the gap between top surfaces of two Apex Seals picked from three seals on one Rotor.

Replace all three Apex Seals on a Rotor if delta-D is more than 0.06 mm (0.0024 in).

5.B Apex Seal Inspection.

5.B.a Top of Apex Seal chipped or damaged.

Replace if D is more than 1.0 mm (0.040 in).

5.B.b End of Apex Seal chipped or damaged.

Replace if A is more than 1.0 mm (0.040 in).

5.B.c Vertical grooves on top of Apex Seal.

Reuse if vertical groove area is less than 1/3 L.

6. Corner Seal.

Note: When replacing the two piece type apex seal, replace them as a set (main piece and side piece).

6.A Corner Seal groove on Rotor.

The corner seal groove of the Rotor shall be checked by the bar limit gauge (Go - No Go gauge) and classified into three conditions.

1. Measuring tools required: Bar limit gauge (TKK special tool No. 49 0839 165, MMA No. 4908 39 1650)