Name: ACL BMW B58B30/S58B30 3.0L Inline 6 .50mm Oversized Main Bearings
Brand: ACL
Price: 267.93 USD
Availability: InStock

Question 1

What does +.50mm mean for main bearing sizing?

Accepted Answer

A +.50mm main bearing is 0.50mm (about 0.020 inch) larger in outside diameter than a standard-size bearing. These are used when the engine block has been align bored, or the crankshaft has been ground smaller. Using an oversized bearing restores the proper oil clearance.

Question 2

What else should I replace when installing new main bearings?

Accepted Answer

Whenever you're replacing main bearings, it's smart to also replace the rod bearings at the same time. Check the crankshaft for wear and have it machined if necessary. Always use new main cap bolts, tightened to the manufacturer's specified torque.

Question 3

Do these ACL main bearings come with a warranty?

Accepted Answer

ACL bearings are warranted to be free from defects in material and workmanship. However, like most performance parts, they are not warrantied against wear or damage caused by improper installation or use. Always follow the manufacturer's installation instructions and torque specifications.

ACL BMW B58B30/S58B30 3.0L Inline 6 .50mm Oversized Main Bearings

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