What does it mean that these bearings are undersized by 0.25mm?

An undersized bearing, like this 0.25mm set, is used when the crankshaft journals have been machined down to a smaller diameter. This is a common practice during engine rebuilds to clean up worn or damaged journals. You'll need to ensure your crankshaft has been machined to this specific size before installing these bearings.

Are these bearings sold individually or as a set?

This is a complete set of main bearings for your engine. It includes all the necessary bearings to replace the main bearings on your crankshaft.

What is the main function of crankshaft main bearings?

Crankshaft main bearings sit between the crankshaft and the engine block. Their primary job is to support the crankshaft, allowing it to rotate smoothly while maintaining a precise oil clearance to lubricate the surfaces.

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Est. 1957

ACL KIA 4 1998CC DOHC 1994-98 Engine Crankshaft Main Bearing Set

Specifications

Brand: ACL
Part #: 5M8174A-.25

ACL KIA 4 1998CC DOHC 1994-98 Engine Crankshaft Main Bearing Set

Name: ACL KIA 4 1998CC DOHC 1994-98 Engine Crankshaft Main Bearing Set
Brand: ACL
SKU: acl-acl-kia-4-1998cc-dohc-1994-98-engine-crankshaft-main-bearing-set-t14-630917
Price: 26.48 USD
Availability: BackOrder

$26.48

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

Fits 2003 Ford Focus. ACL crankshaft main bearing set, undersize 0.25mm, for 1998cc DOHC engines. Essential for engine rebuilds.

Key Features

Fits 2003 Ford Focus.
ACL crankshaft main bearing set.
Designed for 1998cc DOHC engines.
Bearing undersize is 0.25mm.
Supports crankshaft rotation and oil clearance.

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Fits this vehicle

Ford Focus 2003

Product Details

When you're rebuilding the heart of your 2003 Ford Focus, the crankshaft main bearings are critical. This set from ACL is specifically made for the 1998cc DOHC engine, and it's undersized by 0.25mm. This means it's designed to be used when the crankshaft journals have been machined down to match this size during an engine rebuild, ensuring a proper fit and oil clearance.

ACL has been making engine bearings for a long time, and they're known for their well-built components. These main bearings are made to meet the demands of an engine that's back in service, helping to maintain the correct oil pressure and support the crankshaft smoothly. Getting the right size bearing, especially when you're dealing with machined journals, is key to a successful engine build. This set is a solid option for getting your Focus engine back in shape.