King Engine Bearings MB5780SM Main Bearing Set BMW N47 D20 A/B/C/D N47 C20 A SM-Series Bimetal

The King Engine Bearings MB5780SM is an OE-replacement crankshaft main bearing set engineered for BMW N47 D20 A/B/C/D and N47 C20 A diesel engines. This set includes 5 pairs of bimetal main bearing shells constructed from King's SM-Series strengthened aluminum alloy.

SM-Series Bimetal Construction:

• Aluminum alloy base layer enhanced with Manganese (Mn) and Chromium (Cr) additions for superior strength
• King's strongest aluminum-based alloy formulation — engineered specifically for high-load applications
• Excellent wear resistance properties for long service life
• 100% lead-free construction, meeting modern environmental standards
• Bi-metal design provides an optimal balance of hardness and conformability

Set Contents & Specifications:

• Includes 5 pairs of crankshaft main bearing shells (complete set)
• Available in standard and multiple oversize options (+0.25mm, +0.50mm, +0.75mm)
• Replaces OEM part numbers including: 11217802651, 11217802655, 11218517935, 11218517939, and related BMW main bearing references

About King Engine Bearings:

• Founded in 1960 with a focus on precision engine bearing manufacturing
• Trusted by the aviation and motorsport industries for demanding, high-performance applications
• Engineered to aftermarket standards, offering wider size ranges and material options than OEM
• Manufactured entirely under one roof using advanced production technology including Bull's Eye Tolerance™ for precision fitment

The MB5780SM is a direct OE-quality replacement crankshaft main bearing set, delivering reliable performance for engine rebuilds and high-mileage restorations on BMW 2.0L 4-cylinder diesel applications.