What does the '+0.50mm' sizing mean for these bearings?

The '+0.50mm' indicates that these main bearings are 0.50mm larger in diameter than standard size. This means they are intended for use when the engine's crankshaft main journals have been machined down by 0.50mm during an engine rebuild to correct wear or damage.

What is the 'SI' material used in these bearings?

The 'SI' designation refers to King Engine Bearings' high-performance tri-metal material. This material is known for its excellent durability, wear resistance, and ability to maintain proper oil film under demanding engine conditions.

Are these bearings a direct replacement for all M271 C-Class engines?

These bearings are specifically sized at +0.50mm, meaning they are not a direct replacement for engines with standard-sized crankshaft journals. They are intended for M271 C-Class engines that have had their main journals machined to accept this undersize.

Specifications

Brand: King Engine Bearings
Part #: MB5666SI0.5
UPC: 611500539527

King Engine Bearings Mercedes Benz M271 C-Class (Size +0.50mm) Main Bearing Set

Name: King Engine Bearings Mercedes Benz M271 C-Class (Size +0.50mm) Main Bearing Set
Brand: King Engine Bearings
SKU: king-engine-bearings-king-engine-bearings-mercedes-benz-m271-c-class-size-0-50mm-t14-770897
Price: 50.52 USD
Availability: BackOrder

$50.52

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King Engine Bearings Main Bearing Set MB5666SI0.5. For Mercedes Benz M271 C-Class engines, +0.50mm undersize.

Key Features

This is a King Engine Bearings Main Bearing Set, part number MB5666SI0.5.
This set is +0.50mm undersize, intended for machined crankshaft journals.
Designed for Mercedes Benz M271 C-Class engines.
Features King's high-performance tri-metal 'SI' material for durability and oil retention.
Helps ensure proper oil clearance for engine longevity.

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About this part

Product Details

This is a King Engine Bearings Main Bearing Set, part number MB5666SI0.5. This set is specifically sized at +0.50mm, meaning it's intended for crankshaft journals that have been machined down by 0.50mm during an engine rebuild. These bearings are designed for Mercedes Benz M271 C-Class engines.

King Engine Bearings uses a high-performance overlay with a unique micro-structure that helps to reduce friction and improve oil retention. This particular set is built with their 'SI' material, which is a high-performance tri-metal material known for its durability and ability to handle demanding conditions. When rebuilding an M271 engine, using bearings that are the correct size and made from a solid material like this is crucial for ensuring proper oil clearance and long-term engine health.