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

The +0.25mm designation indicates that these bearings are 0.25mm undersize. This means they are intended for use in an engine block where the main crankshaft journals have been machined down by 0.25mm to ensure they are perfectly round and true.

What material are these bearings made from?

These bearings feature King's specialized overlay material, which is bonded to a steel backing. This construction is designed to offer good wear resistance while also being conformable to protect the crankshaft.

Are these bearings suitable for a stock, unmachined crankshaft?

No, these bearings are specifically 0.25mm undersize and are intended for use only after the engine block's main journals have been machined down by 0.25mm. Using them on a stock-sized crankshaft will result in excessive clearance and potential engine damage.

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Specifications

Brand: King Engine Bearings
Part #: MB5656SI0.25
UPC: 611500534874

King Engine Bearings Toyota 1Zr-Fe (Size +0.25mm) Main Bearing Set

Name: King Engine Bearings Toyota 1Zr-Fe (Size +0.25mm) Main Bearing Set
Brand: King Engine Bearings
SKU: king-engine-bearings-king-engine-bearings-toyota-1zr-fe-size-0-25mm-main-bearing-t14-770886
Price: 60.94 USD
Availability: BackOrder

$60.94

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King Engine Bearings Toyota 1Zr-Fe (Size +0.25mm) Main Bearing Set. These main bearings are 0.25mm undersize for rebuilding your engine.

Key Features

Main bearing set for Toyota 1Zr-Fe engines.
Bearings are 0.25mm undersize, intended for machined crankshaft journals.
Features King's specialized overlay material for wear resistance and conformability.
Well-built with a steel backing for solid support.

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About this part

Product Details

These King Engine Bearings main bearings are built to a 0.25mm undersize specification, meaning they are designed for engine blocks that have been machined down by 0.25mm to true up the crankshaft journals. This set is specifically made for Toyota 1Zr-Fe engines, ensuring a precise fit when you're rebuilding the bottom end of your motor. King uses a specialized overlay material that's bonded to a steel backing, offering a good balance of wear resistance and conformability to protect your crankshaft.

When you're rebuilding an engine, the main bearings are critical for supporting the crankshaft and maintaining proper oil clearance. These bearings are well-built to handle the stresses of daily driving and help ensure your engine runs smoothly. The 0.25mm undersize is important to note; this set is not for a stock-sized crankshaft journal and requires that the block has been machined accordingly.