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With reference to the engine manf. tolerances and record sheet, using a calibrated micrometer. Bottom end bearing is removed from crankpin / piston removed. Surface wiped clean. Then at the specified points in the record sheet, measure the diameter. Normally at least 0, 45, 90, 135 deg. with ref to TDC and 5 equal distance locations across the pin.

Normally wear would be seen at the top (highest loaded point), and may require grinding undersize to remove ovality, followed by thorough oil flushing / locate source of contamination.

Check piston rings, skirt and liner condition for wear / abnormalities

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