What does the '0.25' in the part number signify?

The '0.25' in MB5009XP0.25 indicates that this is a 0.25mm undersize bearing set. This means the crankshaft journals have been machined down by 0.25mm to accept these bearings, which is a common practice during engine rebuilds to restore proper clearances.

What is the primary function of main bearings?

Main bearings support the crankshaft within the engine block. They create a precise gap for oil to lubricate the rotating crankshaft, reducing friction and wear between the crankshaft and the engine block.

Are these bearings suitable for a stock engine rebuild?

This set is 0.25mm undersize, meaning it's intended for engines where the crankshaft has been machined to this specific size. If your crankshaft is still at standard size, you would need a standard size bearing set.

Specifications

Brand: King Engine Bearings
Part #: MB5009XP0.25
UPC: 611500614538

King Engine Bearings Ford Fiesta 1.25I (Zetec/Ecoboost 1.6) (Size 0.25) Main Bearing Set

Name: King Engine Bearings Ford Fiesta 1.25I (Zetec/Ecoboost 1.6) (Size 0.25) Main Bearing Set
Brand: King Engine Bearings
SKU: king-engine-bearings-king-engine-bearings-ford-fiesta-1-25i-zetec-ecoboost-1-6-s-t14-432425
Price: 121.31 USD
Availability: BackOrder

$121.31

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King Engine Bearings main bearing set for Ford Fiesta 1.25I (Zetec/Ecoboost 1.6). This is a 0.25mm undersize set.

Key Features

This is a 0.25mm undersize main bearing set.
Designed for Ford Fiesta 1.25I Zetec and Ecoboost 1.6 engines.
King Engine Bearings are well-built for reliable engine operation.
Helps ensure proper oil clearance for the crankshaft.

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About this part

Product Details

If you're rebuilding the engine in your Ford Fiesta with the 1.25I Zetec or Ecoboost 1.6 engine, this King Engine Bearings Main Bearing Set is a solid option. This set is specifically sized at 0.25mm undersize, which is crucial for engines that have had their crankshaft journals machined to match this size during a rebuild. King is known for making well-built bearings that help ensure your engine runs smoothly and reliably after the work is done.

These bearings are designed to handle the pressures and temperatures found in a running engine, providing a durable surface for the crankshaft to rotate within. Using the correct size bearings, especially when dealing with machined journals, is key to proper oil clearance and long-term engine health. King uses advanced materials and manufacturing processes to create bearings that offer good performance for everyday driving and more demanding use.