ROTOR INSPECTION

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1.  Inspect the rotor and side housing clearance according to the following procedure:

•  If it is less than the minimum specification, replace the rotor.
(1)  Measure the width of the rotor housing in the position shown in the figure using a micrometer.
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(2)  Measure the rotor width at various positions around the rotor round periphery using a micrometer.
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(3)  Compute the rotor and side housing clearance using the measurements from (1) and (2).
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Rotor and side housing clearance = (rotor housing width) – (maximum rotor width)
Standard clearance
0.05—0.19 mm {0.0020—0.0074 in}
Minimum clearance
0.05 mm {0.002 in}

2.  Measure the protrusion of the rotor round using a straight edge and a feeler gauge.

Caution
•  Measure the the protrusion of the rotor round in the three apexes of the rotor on both the front and rear sides.
•  Because the rotor round has two levels, be careful not to measure the level difference of the middle level.
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•  If it is less than the minimum specification, replace the rotor.
Standard projection
0.12—0.18 mm {0.0048—0.0070 in}
Minimum projection
0.1 mm {0.0039 in}

3.  Inspect the corner seal groove of the rotor by inserting the SST.

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•  If 1/2 or more of either end of the SST can be inserted into the seal groove, replace the rotor.
Caution
•  Do not push the SST in with force.
•  Keep the SST perpendicular to the seal groove.

4.  Measure the clearance between the apex seal groove and the apex seal using a feeler gauge.

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•  If it exceeds the maximum specification, replace the apex seal.
•  If the clearance still exceeds the maximum specification after replacing the apex seal, replace the rotor.
Caution
•  The standard clearance is only for a new part.
Standard clearance
0.042—0.077 mm {0.0017—0.0030 in}
Maximum clearance
0.15 mm {0.0059 in}