What is the purpose of main bearings in an engine?

Main bearings are a critical component that supports the crankshaft within the engine block. They allow the crankshaft to rotate smoothly while handling the significant forces generated during combustion and power delivery.

When should I replace my main bearings?

Main bearings are typically replaced during a comprehensive engine rebuild or overhaul. If you're experiencing engine noise, oil pressure issues, or have found wear on your crankshaft, it's a good time to consider replacement.

Do these bearings come with assembly lube?

This set includes the main bearings themselves. It is recommended to use a high-quality engine assembly lubricant on the bearings and crankshaft journals before installation, following the manufacturer's specific instructions.

2008-2013 BMW M3 Main Bearings | ACL 5M1581HX-STD

Name: ACL BMW S65B40 4.0L V8 Standard Size Main Bearings
Brand: ACL
SKU: acl-acl-bmw-s65b40-4-0l-v8-standard-size-main-bearings-t14-719906
Price: 295.60 USD
Availability: BackOrder

ACL BMW S65B40 4.0L V8 Standard Size Main Bearings

$295.60

On Backorder

Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

Fits 2008-2013 BMW M3. ACL standard size main bearings for your S65B40 4.0L V8 engine. Well-built for reliable performance.

Key Features

Fits 2008-2013 BMW M3.
Standard size main bearings for the S65B40 4.0L V8 engine.
Well-built by ACL to meet original equipment specifications.
Supports the crankshaft and handles engine loads during operation.

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Product Details

Doing some engine work on your 2008-2013 BMW M3? If you're rebuilding the S65B40 4.0L V8, a fresh set of main bearings is crucial. These bearings sit between the crankshaft and the engine block, supporting the rotating assembly and handling the immense forces generated by that high-revving V8. Replacing them during an engine overhaul ensures smooth operation and helps prevent premature wear on your crankshaft.

ACL is known for making solid engine bearings, and this set is no different. They're built to the original equipment specifications, meaning they fit right and perform as expected. Using standard size bearings is the way to go if your crankshaft journals are still within factory tolerances. This helps maintain proper oil clearance, which is key for lubrication and cooling under demanding conditions.

When you're putting an engine back together, using reliable components like these ACL main bearings gives you peace of mind. Make sure to follow the manufacturer's installation instructions carefully, especially regarding bearing oil and torque specifications, to get the best results.