What does the +0.25mm sizing mean for these bearings?

The +0.25mm sizing indicates that these main bearings are designed for a crankshaft that has been machined undersize by 0.25mm. This is a common practice when rebuilding an engine to ensure proper oil clearance after wear or machining.

Are these bearings suitable for a standard, unmachined crankshaft?

No, these bearings are specifically sized at +0.25mm and are intended for use with a crankshaft that has been machined to that specific undersize. Using them on a standard crankshaft will result in incorrect oil clearance.

What is the primary function of main bearings in an engine?

Main bearings support the crankshaft within the engine block. They allow the crankshaft to rotate smoothly while withstanding the significant forces generated during the combustion cycle.

King Engine Bearings Main Bearing Set MB5666SI0.25

Name: King Engine Bearings Mercedes Benz M271 C-Class (Size +0.25mm) Main Bearing Set
Brand: King Engine Bearings
SKU: king-engine-bearings-king-engine-bearings-mercedes-benz-m271-c-class-size-0-25mm-t14-770896
Price: 50.52 USD
Availability: BackOrder

King Engine Bearings Mercedes Benz M271 C-Class (Size +0.25mm) Main Bearing Set

$50.52

On Backorder

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 Mercedes-Benz M271 C-Class. Size +0.25mm.

Key Features

Fits Mercedes-Benz M271 C-Class engines.
Main bearing set with a +0.25mm undersize.
Supports the crankshaft for smooth rotation.
Designed to handle engine loads during operation.

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Product Details

This is a main bearing set from King Engine Bearings, specifically sized at +0.25mm for Mercedes-Benz M271 C-Class engines. Main bearings are critical components that support the crankshaft within the engine block, allowing it to rotate smoothly while handling significant loads. When rebuilding or repairing an M271 engine, especially if the crankshaft has been machined undersize, using a correctly sized bearing set like this one is essential for proper oil clearance and engine longevity.

King Engine Bearings is known for its well-built engine components. This set is manufactured to King's standards, ensuring it meets the demands of supporting a rotating crankshaft. The +0.25mm sizing indicates these bearings are intended for a crankshaft that has been ground down by 0.25mm from its original size, which is a common practice during engine overhauls to address wear or damage. Proper installation with the correct oil clearance is key to achieving the intended performance and durability from these bearings.