What is the purpose of main bearings in an engine?

Main bearings support the crankshaft within the engine block. They create the necessary clearance for the crankshaft to spin freely while maintaining oil pressure for lubrication, reducing friction and wear.

When should I consider replacing my main bearings?

Main bearings are typically replaced during an engine rebuild or overhaul. Signs of wear include low oil pressure, knocking noises from the bottom end, or excessive crankshaft play.

Does this bearing set come with installation hardware?

This set includes the main bearings themselves. It does not typically include crankshaft bolts or other installation hardware, which should be sourced separately if needed.

ACL Engine Bearings 7M1397H-STD

Name: ACL BMW N54/N55/S55B30 3.0L Standard Size Main Bearing Set
Brand: ACL
SKU: acl-acl-bmw-n54-n55-s55b30-3-0l-standard-size-main-bearing-set-t14-479943
Price: 311.90 USD
Availability: InStock

ACL BMW N54/N55/S55B30 3.0L Standard Size Main Bearing Set

$311.90

In Stock

ACL BMW N54/N55/S55B30 3.0L Standard Size Main Bearing Set

Key Features

Fits 13+ BMW vehicle make/model combinations with 3.0L N54, N55, and S55B30 engines.
Standard size main bearing set for use with a crankshaft within original specifications.
Constructed with a tri-metal overlay for durability and good wear characteristics.
Designed to maintain proper oil clearance for effective engine lubrication.
ACL is a well-known manufacturer with a long history in engine bearing production.

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Will this fit your vehicle?

Product Details

ACL has been making engine bearings for decades, and this standard size main bearing set for your BMW is one of their staples. These bearings are crucial for keeping your engine's crankshaft properly supported and spinning smoothly within the engine block. For the N54, N55, and S55B30 3.0L engines found in many popular BMW models, having a well-built set of main bearings is key to engine longevity and performance, especially if you're rebuilding or refreshing your engine.

This set is built with a tri-metal overlay, a common and effective material for bearings that offers good wear resistance and conformability to the crankshaft. They are manufactured to standard size, meaning they're intended to be used with a crankshaft that is still within its original specifications, without excessive wear or damage. ACL is known for their attention to detail in bearing manufacturing, ensuring consistent wall thickness and proper oil clearance, which is vital for oil flow and lubrication to prevent friction and heat buildup.

When you're installing these bearings, remember to always follow the manufacturer's recommended torque specifications and lubrication procedures. Proper installation is just as important as the quality of the part itself for ensuring your engine runs reliably. This set is designed to fit a range of BMW models, so be sure to check the fitment list to confirm it's the right part for your specific vehicle.