What does the '+0.05mm' size designation mean for these bearings?

The '+0.05mm' indicates that these bearings are 0.05 millimeters larger in diameter than standard size. This means they are intended for use when the engine's crankshaft journals have been machined down by 0.05mm during an engine rebuild to correct wear or damage.

What is the King XP overlay, and why is it important?

The XP overlay is a tin-based material applied by King Engine Bearings. It's designed to offer increased strength and better durability compared to standard bearing materials, helping to protect the bearing surface and the crankshaft under demanding conditions.

Are these bearings suitable for a performance engine build?

Yes, the XP high-performance overlay and the focus on maintaining consistent oil clearance make these bearings a solid option for performance applications or engines that will be used frequently.

Specifications

Brand: King Engine Bearings
Part #: MB5082XP0.5
UPC: 611500573132

King Engine Bearings BMW M40/ M42/ M43 1.6L/ 1.8L Main Bearing Set - Size +0.05mm

Name: King Engine Bearings BMW M40/ M42/ M43 1.6L/ 1.8L Main Bearing Set - Size +0.05mm
Brand: King Engine Bearings
SKU: king-engine-bearings-king-engine-bearings-bmw-m40-m42-m43-1-6l-1-8l-main-bearing-t14-432427
Price: 229.40 USD
Availability: BackOrder

$229.40

On Backorder — Expected to ship by Sep 16, 2026

Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

King Engine Bearings main bearing set for BMW M40, M42, M43 1.6L/1.8L engines. Size +0.05mm.

Key Features

This is a main bearing set for BMW M40, M42, and M43 engines.
The bearings are 0.05mm oversize, intended for use with a machined crankshaft.
Features King's XP high-performance overlay for improved strength and durability.
Built with a hardened steel backing for solid support.
Designed to maintain consistent oil clearance for engine protection.

Secure CheckoutFast Shipping631-982-0042

About this part

Product Details

These King Engine Bearings main bearings are precisely 0.05mm oversize, meaning they are designed to be used when the crankshaft journals have been machined down by that amount during an engine rebuild. This specific sizing is crucial for restoring proper oil clearance in engines where the original journals have been ground undersize. They are built for BMW M40, M42, and M43 engines found in many 1.6L and 1.8L applications.

King uses their XP high-performance overlay, which is a tin-based material that offers improved strength and durability compared to standard bearings. This overlay is applied over a hardened steel backing, providing a solid foundation for the bearing surface. The design focuses on maintaining consistent oil film thickness across a range of operating conditions, which is vital for protecting the crankshaft and block from wear, especially in performance-oriented builds or engines that see frequent use.

When rebuilding an engine, using bearings that are the correct size and made from durable materials is essential for longevity. These King bearings are a well-built option for restoring the bottom end of your BMW's engine, ensuring proper lubrication and support for the crankshaft.