What does the 0.25 undersize mean for these bearings?

The 0.25 undersize indicates that these bearings are intended for a crankshaft that has been machined down by 0.00025 inches (0.00635mm). This ensures a precise fit and proper oil clearance when used with a reconditioned crankshaft.

What is the benefit of the coated performance bearings?

The specialized coating on these King performance bearings helps to reduce friction during engine operation and improves wear resistance. This is especially beneficial for engines that experience higher loads or more spirited driving.

What is required for installation of these main bearings?

Installation requires careful attention to detail, including ensuring the crankshaft journals are perfectly clean and free of any debris. It is critical to follow the manufacturer's specified torque values for the main bearing caps to ensure proper seating and function.

King Engine Bearings Main Bearing Set MB7779XPC0.25

Name: King Engine Bearings BMW B58B30A (Size 0.25) Coated Performance Main Bearing Set
Brand: King Engine Bearings
SKU: king-engine-bearings-king-engine-bearings-bmw-b58b30a-size-0-25-coated-performan-t14-438910
Price: 191.53 USD
Availability: InStock

King Engine Bearings BMW B58B30A (Size 0.25) Coated Performance Main Bearing Set

$191.53

Only 3 left in stock

King Engine Bearings performance main bearing set for BMW B58B30A engines. Size 0.25.

Key Features

This is a set of coated performance main bearings sized 0.25 undersize.
Designed for BMW B58B30A engines.
Features a specialized coating for reduced friction and improved wear resistance.
The 0.25 undersize is for use with a machined crankshaft.
Crucial for maintaining proper oil pressure and engine health.

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Product Details

This is a set of coated performance main bearings from King Engine Bearings, specifically sized at 0.25 undersize for BMW B58B30A engines. These bearings are crucial for the rotating assembly, providing a smooth, low-friction surface between the crankshaft and the engine block. When rebuilding or refreshing an engine, especially one that sees spirited use, ensuring the main bearings are in top condition is key to oil pressure and overall engine health.

King's performance bearings feature a specialized coating that helps reduce friction and improve wear resistance, which is particularly beneficial in high-performance applications. The 0.25 undersize means these bearings are intended for use with a crankshaft that has been machined down by 0.00025 inches (0.00635mm) to ensure a precise fit and proper oil clearance. This level of detail is important for engine builders aiming for optimal performance and longevity.

When installing these bearings, it's essential to follow the manufacturer's torque specifications and ensure the crankshaft journals are clean and free of debris. Proper installation is critical for the bearings to perform as intended and protect your engine.