TM 5-4320-302-146-17. CONNECTING ROD ASSEMBLY (CONT)Location/ItemActionRemarks14. Big-enda.Measure with inside micrometer at points 1bearing boreand 2 and along axis A and B. Measurementshould be 2.0488 to 2.0501 inches (52.04 to52.073 mm) for nominal bearing bore butrespectively smaller for undersized bores.NOTESee chart for nominal and undersized bore sizes for big-end bearing.b.If any measurement is outside the tolerancelimits, replace the big-end bearing. Make surethat measurements at points 1 and 2 are notdifferent nor outside the tolerance limitsindicating that bearing is wearing in a conicalshape. Make sure measurements along axis Aand B are not different nor outside the tolerancelimits indicating the bearing is wearing in anoval shape. If bearing is wearing out-of-round,replace it and check the crankpin on thecrankshaft. Follow procedure described inparagraph 6-18. Also check pistons andcylinders for unusual wear. Follow proceduresdescribed in paragraphs 6-15 and 6-16.6-131
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