Name: ACL BMW M40B16/18 (1.6L / 1.8L / 1.9L) .50 Oversized Main Bearing Set
Brand: ACL
Price: 195.96 USD
Availability: InStock

Question 1

What does it mean to have an oversized bearing?

Accepted Answer

When an engine is rebuilt, sometimes the surfaces that the bearings ride on are machined to make them smooth and round again. This removes material, so the bearing needs to be slightly thicker to take up the extra space. An oversized bearing set compensates for this machining.

Question 2

How do I know if I need an oversized bearing set?

Accepted Answer

Consult with the machine shop doing the engine work. They will measure the crankshaft and bearing surfaces and advise on the correct bearing size to achieve the proper oil clearance. Using the wrong size bearing can cause engine damage.

Question 3

What other parts should I replace when replacing the main bearings?

Accepted Answer

At a minimum, replace the connecting rod bearings at the same time. It's also best practice to replace the main bolts or studs, as they are often torque-to-yield and should not be reused. Always refer to the manufacturer's recommendations for specific torque specs and procedures.

ACL BMW M40B16/18 (1.6L / 1.8L / 1.9L) .50 Oversized Main Bearing Set

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