The Volvo Penta Main Crankshaft Bearing Kit – 0.030″ Oversize 875307 is designed for use in the Volvo Penta marine diesel engines AQD21A, AQD21B, MD21A where the crankshaft journals have been reground by 0.030 inches . Main bearings are critical components that support the crankshaft, maintain correct alignment, and ensure smooth engine rotation under load. This 0.030″ oversize bearing set is intended for professional engine rebuilds and bottom-end overhauls where standard bearings are no longer suitable. Manufactured to OEM-equivalent specifications, these bearings provide precise oil clearance, durability, and reliable performance in demanding marine environments. Product Type Main crankshaft bearing kit Part Number 875307 Bearing Size Oversize 0.030″
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