Criteria For Replacement of Rotary Engine Parts

 

Rotor Housing

 

Difference in width:

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

2. Measure the difference in width between A, and the smallest of B, C, or D. Replace if the difference is more than 0.06 mm (0.0024 in).

Damages on the trochoid surface:

Vertical Scratches on trochoid surface.

1. Inspection - Visual and Sensual Inspection.

2. Vertical scratches on trochoid surface.

Replace if the depth of scratches is more than 0.02 mm )0.0008 in). As for the vertical scratches of the Rotor Housing edge, the Rotor Housing is re-useable even if the steel base under the chromium plating is exposed, if this has occurred no more than 2mm (0.08 in) from the edge.

Chipping of chromium plated surface.

1. Measuring tool required: Vernier calipers or Ruler.

2. Width of chips. Replace if chipping extends inward more than 2mm (0.08 in).

 

 

 

Trochoid surface.

1. Inspection - Visual Inspection.

2. Trochoid surface. Re-use the housing if there is no other damage than that shown below

Corroded wear on the cooling jacket of rotor housing:

1. Measurement tool required - Vernier Calipers.

2. Width of Cooling Jacket at E. Replace if width E is less than 0.5mm (0.020 in).

 

 

 Note: Check the Boss area around the spark plug hole and the inside wall of housing, because in rare cases there will be deep corrosion in that area.

Note: When overhauling the engine, install the protector (Part No. 0866 23 0250) to the outside of the inner sealing rubber as shown in image. This will improve the durability of the sealing rubber.

 

2. Side Housing (Front, Intermediate, Rear):

Note: Even if the side housings are out of the following criteria (2A, 2B, 2C) they can be re-used by regrinding them, unless they have extreme damage due to overheating, engine seizing, or cracking. However the following required finish must be maintained if the housings are reground:

Grinding Precision:

 

Surface Roughness Between 0.0007 - 0.0020 mm (0.00003 - 0.00008 in)

 

Surface flatness - Within 0.03 mm (0.0012 in)

 

Regrinding amount - Less than 0.18 mm (0.07 in)*

 

 

*Less than 0.10 mm (0.004 in) in case with 80 C sprayed layer

 

2.A Side Housing Distortion.

1. Measuring tools required:  Straight Edge (60cm), Feeler Gauge (0.04mm).

2. Area of distortion 1,2,3 & 4, Limit of distortion - 0.04 mm (0.0016 in).

2.B Side Housing Wear.

2.B.a Stepped wear by Side Seal (Vertical Wear).

1. Measuring tools required:  Dial Indicator (Sharpen tip of gauge by grinding), Magnetic Stand. Limitation of wear - 0.10 mm (0.0039 in)

 

2. Stepped wear by Side Seal.

2.B.b Stepped wear by Side Seal.

1. Measuring tools required:  Dial Indicator, Magnetic Stand.

2. Stepped wear by Side Seal. Limitation of Wear:

Inside of Oil Seal tracing mark a - 0.010 (0.0004 in)

Outside of oil seal tracing mark b - 0.10 (0.0039 in)

2.B.c Stepped wear by Oil Seal.

1. Measuring tools required:  Dial Indicator, Magnetic Stand.

2. Stepped wear by Oil Seal. Limitation of wear - 0.02 mm (0.0008 in).

2.C Scratches on the sliding surface.

1. Measuring tools required:  Dial Indicator, Magnetic Stand.

2. Scratch Area A, B, and C.

Depth limit of scratches:

A - 0.01 mm (0.0004 in)

B - 0.1 mm (0.0039 in)

C - 0.1 mm (0.0039 in)

2.D Fretting and Corrosion.

2.D.a Fretting.

1. Measuring tools required:  Dial Indicator, Magnetic Stand.

2. Fretting Area F.

Limit of Fretting - 0.07 mm (0.0028 in)

2.D.b Corrosion.

1. Measuring tools required:  Dial Indicator, Magnetic Stand.

2. Corrosion Area C.

Depth limit of corrosion - 0.020 mm ( 0.0079 in).

2.E. Chips around Eccentric Shaft Bore. Replace if chips are beyond oil seal tracing mark.