Main Bearing Kit (STD) for Hyundai Coupe, Sonata, Santa Fe, and Tucson 2.4L/2.0L (2006–2020) — (Fits: Hyundai)
Bearings for the Hyundai G4KC (2.4L Theta II) engine typically utilize King Engine Bearings’ MB5707SI (main bearings) and CR4624SM/CR4668XP (connecting rod bearings) kits. Specifically, the main bearings are designed for crankshafts with a diameter of 51.94–51.96 mm and feature a thickness of 2.015 mm; the connecting rod bearings are designed for crankshafts with a diameter of 47.95–47.97 mm, possess a maximum wall thickness of 1.501 mm, and support both standard and oversized (+0.25–1.0 mm) clearance specifications.
Description
Main Bearing Specifications (King MB5707SI):
Part Number: MB5707SI
Crankshaft Diameter: 51.94 mm – 51.96 mm (2.0450″ – 2.0457″)
Housing Bore Diameter: 55.001 mm – 55.018 mm (Approx.)
Thickness: 2.015 mm (0.0793″)
Material: High-strength tri-metal or aluminum-silicon alloy base
G4KC Bearing OE Part Numbers: 21020-25120, 21060-25120, 21020-25150










