Name: ACL BMW M20/M50/M52/M54 - 1919CC 80.0mm Bore 66.0mm Stroke .25 Oversized Main Bearing Set
Brand: ACL
Price: 259.03 USD
Availability: InStock

Question 1

What does it mean to have a .25mm oversized bearing?

Accepted Answer

When an engine is rebuilt, the machining process can enlarge the bearing bores in the block. An oversized bearing compensates for this extra space, maintaining the correct oil clearance between the bearing and the crankshaft. This ACL set is 0.25mm (0.010") larger than the standard bearing size.

Question 2

How do I know if I need oversized bearings?

Accepted Answer

During an engine rebuild, a machinist will measure the crankshaft and bearing bores to determine the correct bearing size. They will advise you on whether standard or oversized bearings are required to achieve the proper oil clearance. Always follow the machinist's recommendations.

Question 3

Are there any special installation instructions for these bearings?

Accepted Answer

While these ACL bearings are designed as a direct replacement, it's crucial to follow the manufacturer's recommended procedures for bearing installation. Refer to the engine service manual for proper torque specifications and any specific instructions related to bearing installation. Cleanliness is critical.

ACL BMW M20/M50/M52/M54 - 1919CC 80.0mm Bore 66.0mm Stroke .25 Oversized Main Bearing Set

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