What does the '+0.25mm' size mean for these main bearings?

The '+0.25mm' indicates that these bearings are 0.25 millimeters larger in diameter than standard size. This is typically used when the crankshaft journals have been machined down (ground undersize) to remove imperfections and a larger bearing is needed to restore proper clearance.

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

These bearings feature a lead-free composite material that is ideal for low to medium-load engines. For high-performance or racing applications, you may want to consult King Engine Bearings' performance line for bearings designed for more extreme conditions.

What is the benefit of a bi-metal aluminum material?

Bi-metal construction combines the strength and rigidity of steel with the bearing properties of aluminum alloys. This design helps to dissipate heat effectively and provides a good surface for the crankshaft to rotate against, contributing to engine longevity.

Specifications

Brand: King Engine Bearings
Part #: MB5089AM0.25
UPC: 611500369117

King Engine Bearings Toyota 1Rz (Size +0.25mm) Main Bearing Set

Name: King Engine Bearings Toyota 1Rz (Size +0.25mm) Main Bearing Set
Brand: King Engine Bearings
SKU: king-engine-bearings-king-engine-bearings-toyota-1rz-size-0-25mm-main-bearing-se-t14-770483
Price: 34.38 USD
Availability: BackOrder

$34.38

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Fits 1995-2004 Toyota Tacoma. King Engine Bearings main bearing set, 0.25mm oversize. Lead-free composite for low to medium-load engines.

Key Features

Fits 1995-2004 Toyota Tacoma, 1996-2000 Toyota 4Runner, 1991-1997 Toyota Previa, and 1994-1998 Toyota T100.
Main bearing set is 0.25mm oversize for use with machined crankshaft journals.
Features a lead-free, environmentally safe composite material.
Ideal for low to medium-load engines.
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

When you're rebuilding the bottom end of your 1995-2004 Toyota Tacoma, getting the main bearings right is crucial for engine health. These main bearings from King Engine Bearings are specifically made for the 1Rz engine and are sized 0.25mm oversize, which is important if your crankshaft journals have been machined to match this size during a rebuild.

King specializes in bearings, and they've built their reputation on supplying well-built parts. This set uses a lead-free, environmentally safe composite material that's ideal for engines that aren't under extreme load. The bi-metal aluminum construction offers a solid foundation for smooth rotation and proper oil clearance, helping to ensure your engine runs quietly and efficiently.