Name: ACL BMW N63B44/S63B44 4.4L V8 .025mm Oversized Main Bearings
Brand: ACL
Price: 266.87 USD
Availability: InStock

Question 1

What does it mean to have oversized bearings?

Accepted Answer

When a crankshaft is reground, material is removed, making the journals smaller. Oversized bearings compensate for this material removal, ensuring proper oil clearance between the crankshaft and the bearing surface. Without the correct size, you can have too much or too little clearance, both of which can damage your engine.

Question 2

How do I know if I need oversized bearings?

Accepted Answer

If your crankshaft has been machined, the shop that did the work should specify the required bearing size. Use a micrometer to measure the crank journal, then select the appropriate bearing size to achieve the factory-specified oil clearance.

Question 3

What else should I replace when replacing my main bearings?

Accepted Answer

Whenever you're replacing main bearings, it's best practice to also replace the connecting rod bearings at the same time. Also inspect the crankshaft for wear or damage, and consider replacing the main bearing bolts, as they are often torque-to-yield and should not be reused.

ACL BMW N63B44/S63B44 4.4L V8 .025mm Oversized Main Bearings

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