What does '.025mm undersize' mean for these bearings?

This means the inside diameter of the bearing is slightly smaller than the standard size by 0.025 millimeters. This is necessary when the crankshaft journals have been ground down (machined undersize) during an engine rebuild to ensure the correct oil clearance is maintained.

Are these bearings suitable for a performance engine build?

Yes, ACL bearings are known for their robust tri-metal construction, which offers good strength and conformability. This makes them a popular choice for both stock rebuilds and performance applications where engine stresses are higher.

What other parts are typically needed when replacing main bearings?

When replacing main bearings, it's standard practice to also replace the connecting rod bearings. You'll also need new engine oil, an oil filter, and potentially new main bearing bolts or studs, depending on the manufacturer's recommendations for your specific engine.

ACL BMW B58B30/S58B30 3.0L Inline 6 .025mm Oversized Main Bearings

Specifications

Brand: ACL
Part #: 7M1512H-.025
UPC: 9315726470305

ACL BMW B58B30/S58B30 3.0L Inline 6 .025mm Oversized Main Bearings

Name: ACL BMW B58B30/S58B30 3.0L Inline 6 .025mm Oversized Main Bearings
Brand: ACL
Price: 267.93 USD
Availability: InStock

$267.93

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ACL BMW B58B30/S58B30 3.0L Inline 6 .025mm Oversized Main Bearings for reliable engine rebuilds.

Key Features

Fits 2016-2018 BMW 340i, 2018-2019 BMW X3, and 2020 Toyota GR Supra.
Designed for BMW B58B30 and S58B30 3.0L Inline 6 engines.
Main bearing set is .025mm undersize for use with machined crankshafts.
Features a tri-metal construction for durability and conformability.
Helps maintain proper oil clearance for smooth engine operation.

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Fits these vehicles

BMW 340i 2016-2018
BMW X3 2018-2019
Toyota GR Supra 2020

Product Details

When you're rebuilding the heart of your BMW or Toyota, getting the main bearings right is crucial for engine longevity. These ACL main bearings are specifically made for the B58B30 and S58B30 3.0L inline-6 engines found in models like the 2016-2018 BMW 340i, the 2018-2019 BMW X3, and the 2020 Toyota GR Supra. They are designed to be a .025mm undersize, which is important if your crankshaft journals have been machined down during a rebuild.

ACL has been making engine bearings for a long time, and these are well-built units. They use a tri-metal construction that offers a good balance of strength and conformability, helping to cushion the crankshaft and handle the stresses of performance driving. This means they can handle the demands of both daily driving and more spirited use, ensuring smooth operation and proper oil clearance for your engine.

When you're putting an engine back together, using bearings that fit right and are made to last is key. These ACL bearings are a solid option for anyone looking to rebuild their B58 or S58 engine with confidence.