What does the +0.25mm sizing mean for this bearing set?

The +0.25mm sizing indicates that these bearings are intended for use when the crankshaft journals have been machined down by 0.25mm. This is a common practice during engine rebuilding to account for wear or to achieve a specific clearance.

What is the construction of these main bearings?

These bearings feature a bimetal construction with an aluminum base. This design helps with heat dissipation and provides good wear resistance for the engine's rotating assembly.

Are these bearings a direct replacement for all Nissan engines?

No, these bearings are specifically designed for Nissan L20B, Z20, Z22, and Z24 engines. Always verify your specific engine code and vehicle fitment before purchasing.

Specifications

Brand: King Engine Bearings
Part #: MB587AM0.25
UPC: 611500174117

King Engine Bearings Nissan L20B/Z20/Z22/Z24 (Size +0.25mm) Main Bearing Set

Name: King Engine Bearings Nissan L20B/Z20/Z22/Z24 (Size +0.25mm) Main Bearing Set
Brand: King Engine Bearings
SKU: king-engine-bearings-king-engine-bearings-nissan-l20b-z20-z22-z24-size-0-25mm-ma-t14-771028
Price: 65.23 USD
Availability: BackOrder

$65.23

On Backorder — Expected to ship by Jun 14, 2026

Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

King Engine Bearings Main Bearing Set for Nissan L20B, Z20, Z22, Z24 engines. This is a 0.25mm undersize set.

Key Features

Fits Nissan L20B, Z20, Z22, and Z24 engines.
Main bearing set sized at +0.25mm for use with machined crankshafts.
Constructed with a bimetal (aluminum base) design for improved heat transfer and wear.
Compatible with various Nissan vehicles including the 200SX, 510, 610, 620, 710, 720, D21, Pathfinder, and Van.

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About this part

Product Details

If you're rebuilding the bottom end of your Nissan L20B, Z20, Z22, or Z24 engine, this Main Bearing Set from King Engine Bearings is a solid option. These bearings are built with a bimetal construction, meaning they have an aluminum base, which helps with heat dissipation and wear resistance. This particular set is sized at +0.25mm, so it's intended for use when the crankshaft journals have been machined down by that amount.

King Engine Bearings is a well-known name in the engine component world, and this set is made to fit a range of Nissan vehicles from the 1970s and 1980s, including models like the 720 pickup, D21, and the early Pathfinder. Proper installation is key with any bearing set; ensure your crankshaft journals are clean and within the specified tolerance for this +0.25mm size before installation.