Westerbeke 9.0 BCG Technical Manual page 117

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4. Measure the rotor shaft's clearance. If it has worn
beyond the allowable limit, replace the rotor and
the rotor housing.
Specified Limit: 0.0018 - 0.0033 inches
(0.045 - 0.085 mm)
Allowable Limit: 0.0039 inches (0.10 mm)
5. Measure the tip clearance.
Specified Limit: 0.0059 inches (0.15 mm) or less
Allowable Limit: 0.0079 inches (0.20 mm)
6. Measure side clearance.
Specified Limit: 0.0012 - 0.0035 inches
(0.03 - 0.09 mm)
Allowable Limit: 0.0079 inches (0.20 mm)
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Westerbeke Generators