What does '1.0mm undersize' mean for these bearings?

This means the bearings are manufactured to be 1.0mm smaller in diameter than standard. They are used when the crankshaft journals have been machined down by 1.0mm to remove wear or damage, ensuring proper oil clearance.

What is the advantage of a bimetal aluminum silicon base?

This type of bearing construction offers a good combination of strength and the ability to conform to the crankshaft surface. This helps in proper seating and absorbing operational shock loads for improved engine performance.

Do these bearings come with installation instructions?

While these bearings are designed as a direct replacement, it is always recommended to refer to the manufacturer's installation guide or a qualified mechanic for proper installation procedures and torque specifications.

Specifications

Brand: King Engine Bearings
Part #: CR4515SI1.0
UPC: 611500521065

King Engine Bearings Ford/Mazda Duratec 121Ci 2.0L 16V (Size +1.0mm) Connecting Rod Bearing Set

Name: King Engine Bearings Ford/Mazda Duratec 121Ci 2.0L 16V (Size +1.0mm) Connecting Rod Bearing Set
Brand: King Engine Bearings
SKU: king-engine-bearings-king-engine-bearings-ford-mazda-duratec-121ci-2-0l-16v-size-t14-769858
Price: 28.29 USD
Availability: BackOrder

$28.29

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Fits 2004-2016 Mazda 3. King Engine Bearings connecting rod bearing set, 1.0mm undersize, for Duratec 2.0L engines.

Key Features

Fits 2004-2016 Mazda 3, 2005-2011 Ford Focus, 2010-2013 Ford Transit Connect, and 2006-2013 Mazda MX-5 Miata.
Connecting rod bearing set for Ford/Mazda Duratec 121ci 2.0L 16V engines.
Features a bimetal construction with an aluminum silicon base.
Bearings are 1.0mm undersize, intended for machined crankshaft journals.
Part number CR4515SI1.0.

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About this part

Product Details

Built with a bimetal aluminum silicon base, these King Engine Bearings connecting rod bearings are designed for the Ford/Mazda Duratec 121ci 2.0L 16V engine. When you're rebuilding an engine, especially if it's seen a lot of miles or you're pushing it a bit harder, replacing the connecting rod bearings is a critical step. These bearings are sized 1.0mm undersize, meaning they're intended for crankshaft journals that have been machined down by 1.0mm to correct for wear or damage.

The bimetal construction offers a good balance of strength and conformability, which helps them seat properly against the crankshaft and absorb some of the shock loads inherent in engine operation. This particular set is a popular choice for mechanics working on the Ford Focus, Ford Transit Connect, Mazda 3, and Mazda MX-5 Miata models within the specified year ranges. Ensuring you have the correct bearing size is key for proper oil clearance and engine longevity.