What does the 0.25mm undersize mean for my engine rebuild?

The 0.25mm undersize indicates that these bearings are designed for a crankshaft that has been machined down by 0.25mm. This is common when rebuilding an engine to clean up worn or damaged journals.

Are these bearings suitable for a high-performance engine build?

These bearings are described as ideal for low to medium-load engines. For high-performance or racing applications with significantly increased stress, you may want to consult King Engine Bearings' performance line.

What is the material of these main bearings?

These bearings are made from a bi-metal aluminum material with a lead-free composite overlay. This construction is chosen for its balance of strength and compatibility with engine oils in moderate load conditions.

Specifications

Brand: King Engine Bearings
Part #: MB5287AM0.25
UPC: 611500382048

King Engine Bearings Toyota 1ZZ-FE (Size .25) Main Bearing Set

Name: King Engine Bearings Toyota 1ZZ-FE (Size .25) Main Bearing Set
Brand: King Engine Bearings
SKU: king-engine-bearings-king-engine-bearings-toyota-1zz-fe-size-25-main-bearing-set-t14-423220
Price: 38.87 USD
Availability: BackOrder

$38.87

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Fits 1998-2008 Toyota Corolla. King Engine Bearings Main Bearing Set, 0.25mm undersize. Ideal for low to medium-load engines.

Key Features

Fits 1998-2008 Toyota Corolla, 2000-2005 Toyota Celica, 2000-2005 Toyota MR2 Spyder, and 2003-2008 Toyota Matrix.
Main bearing set for Toyota 1ZZ-FE engines.
Size is 0.25mm undersize, suitable for machined crankshafts.
Features a lead-free, environmentally safe composite material.
Ideal for low to medium-load engine applications.
Constructed with a bi-metal aluminum material.

⚠️ CA WARNING: This product can expose you to chemicals known to the State of California to cause cancer and/or birth defects or other reproductive harm. Learn more

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About this part

Product Details

If you're rebuilding the bottom end of your 1998-2008 Toyota Corolla, getting the main bearings right is crucial for engine health. These main bearings from King Engine Bearings are specifically made for the 1ZZ-FE engine and come at a 0.25mm undersize, which is important if your crankshaft journals have been machined down during the rebuild process.

King Engine Bearings has been focused on making top-notch bearings since 1960. This set uses a lead-free composite material that's environmentally safe and works well in engines that don't see extremely heavy loads, like many daily drivers. The bi-metal aluminum construction offers a solid foundation for your crankshaft, helping to ensure smooth operation and proper oil clearance.

When installing these, make sure your crankshaft journals have been properly cleaned and measured to confirm they are within the 0.25mm undersize specification. Proper installation is key to getting the most out of these well-built bearings.