What does 'undersize' mean for these bearings?

An undersize bearing, like this 0.75mm set, is used when the crankshaft journals have been machined down (ground) to remove imperfections or wear. The undersize dimension accounts for the material removed from the crank, ensuring the correct oil clearance is maintained.

Do I need to replace these if my crankshaft isn't ground?

If your crankshaft journals are still at factory specification and in good condition, you would typically use standard size bearings. This 0.75mm undersize set is specifically for applications where the crankshaft has been machined undersize.

What is the main function of connecting rod bearings?

Connecting rod bearings sit between the crankshaft and the connecting rod. Their primary job is to reduce friction and wear by providing a smooth, lubricated surface for the rotating crankshaft, while also maintaining proper oil pressure within the engine.

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Specifications

Brand: ACL
Part #: 4B4390A-.75

ACL Ford Prod. 4 2.0L Duratec 2005-on Engine Connecting Rod Bearing Set

Name: ACL Ford Prod. 4 2.0L Duratec 2005-on Engine Connecting Rod Bearing Set
Brand: ACL
SKU: acl-acl-ford-prod-4-2-0l-duratec-2005-on-engine-connecting-rod-bearing-set-t14-631995
Price: 10.38 USD
Availability: BackOrder

$10.38

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Fits 2005 Ford Focus. ACL connecting rod bearings, 0.75mm undersize. Essential for engine rebuilds.

Key Features

Fits 2005 Ford Focus.
ACL connecting rod bearing set for 2.0L Duratec engines.
This set is 0.75mm undersize, intended for use with a ground crankshaft.
Ensures proper oil clearance and lubrication for engine longevity.

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About this part

Product Details

Already rebuilt your 2.0L Duratec engine? This set of connecting rod bearings from ACL is the next piece of the puzzle. These bearings are crucial for ensuring smooth operation and proper lubrication between the crankshaft and connecting rods. When you're rebuilding an engine, especially one that's seen some miles, replacing these wear items is a non-negotiable step for reliability.

ACL has been making engine bearings for a long time, and these are well-built for the job. This particular set is 0.75mm undersize, which is important if you've had your crankshaft ground down during the rebuild process. Using the correct undersize bearing ensures a tight, proper oil clearance, which is key to preventing premature wear and oil pressure loss. They fit right into the connecting rods on your 2005 Ford Focus with the 2.0L Duratec engine.