What does the 0.003in undersize (Size 0.25) mean for these bearings?

This means the bearings are manufactured to be slightly smaller than the standard size. This is typically used when the crankshaft journals have been machined down (ground) to a specific undersize during an engine rebuild to ensure proper oil clearance.

Why is proper oil clearance important for connecting rod bearings?

Proper oil clearance allows a thin film of oil to surround the bearing and crankshaft. This oil film prevents metal-on-metal contact, reducing friction and wear, which is essential for the engine's smooth operation and lifespan.

Are these bearings sold individually or as a set?

This product is a set of connecting rod bearings, typically enough for all the connecting rods in the specified engine.

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Specifications

Brand: King Engine Bearings
Part #: CR4689SM0.25
UPC: 611500620119

King Engine Bearings Subaru FB20 Housing Bore +.003in (Size 0.25) Connecting Rod Bearing Set

Name: King Engine Bearings Subaru FB20 Housing Bore +.003in (Size 0.25) Connecting Rod Bearing Set
Brand: King Engine Bearings
SKU: king-engine-bearings-king-engine-bearings-subaru-fb20-housing-bore-003in-size-0--t14-432274
Price: 32.91 USD
Availability: BackOrder

$32.91

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Key Features

Fits Subaru FB20 engines.
Connecting rod bearing set.
Size is 0.003 inches undersize (0.25).
Designed for the specific housing bore of the FB20 engine.

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About this part

Product Details

King Engine Bearings is known for making well-built engine bearings that hold up to demanding use. This set of connecting rod bearings is made specifically for Subaru FB20 engines and is sized 0.003 inches undersize, often referred to as Size 0.25. These bearings are crucial for ensuring proper oil clearance between your connecting rods and crankshaft, which is vital for engine longevity and performance.

When rebuilding or repairing an engine, getting the bearing clearance just right is key. This set is designed to meet the specific housing bore requirements for the FB20 engine, helping you achieve the correct oil film thickness. Using bearings that are the correct size and made with durable materials helps prevent premature wear and potential engine damage.